Journal articles: 'Electron neutrinos'

1

Kajita, Takaaki. "Atmospheric Neutrinos." Advances in High Energy Physics 2012 (2012): 1–24. http://dx.doi.org/10.1155/2012/504715.

Full text

Abstract:

Atmospheric neutrinos are produced as decay products in hadronic showers resulting from collisions of cosmic rays with nuclei in the atmosphere. Electron-neutrinos and muon-neutrinos are produced mainly by the decay chain of charged pions to muons to electrons. Atmospheric neutrino experiments observed zenith angle and energy-dependent deficit of muon-neutrino events. It was found that neutrino oscillations between muon-neutrinos and tau-neutrinos explain these data well. This paper discusses atmospheric neutrino experiments and the neutrino oscillation studies with these neutrinos.

APA, Harvard, Vancouver, ISO, and other styles

2

Nguyen Thi Kim, Ha, Van Nguyen Thi Hong, and Son Cao Van. "Unitarity of neutrino mixing matrix." EPJ Web of Conferences 206 (2019): 09009. http://dx.doi.org/10.1051/epjconf/201920609009.

Full text

Abstract:

Neutrinos are neutral leptons and there exist three types of neutrinos (electron neutrinos νe, muon neutrinos νµ and tau neutrinos ντ). These classifications are referred to as neutrinos’s “flavors”. Oscillations between the different flavors are known as neutrino oscillations, which occurs when neutrinos have mass and non-zero mixing. Neutrino mixing is governed by the PMNS mixing matrix. The PMNS mixing matrix is constructed as the product of three independent rotations. With that, we can describe the numerical parameters of the matrix in a graphical form called the unitary triangle, giving rise to CP violation. We can calculate the four parameters of the mixing matrix to draw the unitary triangle. The area of the triangle is a measure of the amount of CP violation.

APA, Harvard, Vancouver, ISO, and other styles

3

BINGHAM, R., L. O. SILVA, J. T. MENDONCA, P. K. SHUKLA, W. B. MORI, and A. SERBETO. "PLASMA WAKES DRIVEN BY NEUTRINOS, PHOTONS AND ELECTRON BEAMS." International Journal of Modern Physics B 21, no. 03n04 (February 10, 2007): 343–50. http://dx.doi.org/10.1142/s0217979207042112.

Full text

Abstract:

There is considerable interest in the propagation dynamics of intense electron and photon neutrino beams in a background dispersive medium such as dense plasmas, particularly in the search for a mechanism to explain the dynamics of type II supernovae. Neutrino interactions with matter are usually considered as single particle interactions. All the single particle mechanisms describing the dynamical properties of neutrino's in matter are analogous with the processes involving single electron interactions with a medium such as Compton scattering, and Cerenkov radiation etc. However, it is well known that beams of electrons moving through a plasma give rise to a new class of processes known as collective interactions such as two stream instabilities which result in either the absorption or generation of plasma waves. Intense photon beams also drive collective interactions such as modulational type instabilities. In both cases relativistic electron beams of electrons and photon beams can drive plasma wakefields in plasmas. Employing the relativistic kinetic equations for neutrinos interacting with dense plasmas via the weak force we explore collective plasma streaming instabilities driven by Neutrino electron and photon beams and demonstrate that all three types of particles can drive wakefields.

APA, Harvard, Vancouver, ISO, and other styles

4

NIEVES, JOSÉ F., and PALASH B. PAL. "NON-UNIVERSAL GRAVITATIONAL COUPLINGS OF NEUTRINOS IN MATTER." Modern Physics Letters A 14, no. 18 (June 14, 1999): 1199–207. http://dx.doi.org/10.1142/s0217732399001292.

Full text

Abstract:

When neutrinos travel through a normal matter medium, the electron neutrinos couple differently to gravity compared to the other neutrinos, due to the presence of electrons in the medium and the absence of the other charged leptons. The matter-induced gravitational couplings of the neutrinos under such conditions are calculated and their contribution to the neutrino index of refraction in the presence of a gravitational potential is determined.

APA, Harvard, Vancouver, ISO, and other styles

5

Bettini, A. "Experimental Highlights from Gran Sasso Laboratory." International Journal of Modern Physics A 18, supp01 (February 2003): 178–214. http://dx.doi.org/10.1142/s0217751x03016653.

Full text

Abstract:

The Gran Sasso National Laboratory of the INFN has given important contributions to the discovery of the phenomenon of neutrino oscillations with experiments both on electron neutrinos from the Sun and muon neutrinos indirectly produced by cosmic rays interactions in the atmosphere. Other experiments in the laboratory give the best limits on electron neutrino effective Majorana mass with two different isotopes. We appear to have entered a new physics domain in which the study of neutrinos may lead us to discover new phenomena, corresponding to energy scales by much higher than those of the present accelerators. Underground laboratories are showing their relevance complementary to the colliders for the advance of basic physics. The physics program at the Gran Sasso Laboratory that we are defining will be focussed on neutrino physics with a complementary set of experiments on the muon neutrino beam from CERN (CNGS project), on solar neutrinos, on atmospheric neutrinos and on neutrinos from Supernova explosion. The relevant thermonuclear cross-sections will be measured. The Majorana vs. Dirac nature of electron neutrinos will be explored with the search for neutrino-less double beta decays in different isotopes.

APA, Harvard, Vancouver, ISO, and other styles

6

RAJPOOT, SUBHASH. "A MODEL FOR SIMPSON’S 17 keV NEUTRINO." International Journal of Modern Physics A 07, no. 18 (July 20, 1992): 4441–48. http://dx.doi.org/10.1142/s0217751x92001988.

Full text

Abstract:

Recent studies of β-decay spectra seem to confirm Simpson’s earlier findings that the electron neutrinos contain a small (1%) admixture of a 17 keV Dirac neutrino. An unconventional model with SU(2)L×SU(2)R×U(1)B−1 gauge interactions is presented in which all neutrinos are Dirac particles. Electron and muon neutrinos acquire seesaw Dirac masses of order 10−3eV for the MSW solution for the solar neutrino problem. The τ neutrino is identified as Simpson’s 17 keV neutrino. Constraints coming from cosmology and particle physics are shown to be satisfied.

APA, Harvard, Vancouver, ISO, and other styles

7

IBRAHIM, UNGKU FERWANI SALWA UNGKU, NOR SOFIAH AHMAD, NORHASLIZA YUSOF, and HASAN ABU KASSIM. "NEUTRINO ENERGY LOSS AT MATTER-RADIATION DECOUPLING PHASE." Modern Physics Letters A 24, no. 11n13 (April 30, 2009): 1051–54. http://dx.doi.org/10.1142/s0217732309000577.

Full text

Abstract:

Neutrinos are produced copiously in the early universe. Neutrinos and antineutrinos ceased to be in equilibrium with radiation when the weak interaction rate becomes slower than the rate expansion of the universe. The ratio of the temperature of the photon to the temperature of the neutrino at this stage is Tγ/Tν = (11/4)1/3. We investigate the neutrino energy loss due to the oscillation of the electron neutrino into a different flavor in the charged-current interaction of νe-e- based on the work of Sulaksono and Simanjuntak. The energy loss from the neutrinos ΔEν during the decoupling of the neutrinos with the rest of the matter would be a gain in the energy of the electrons and can be obtained from the integration of stopping power equation ΔEν = (dEν/dT-1)dT-1 where Eν and T are the energy of the neutrinos and the temperature respectively. When the universe expands and matter-radiation decouples, an extra energy will be transferred to the photons via the annihilation of the electron-positron pairs, e++e-→γ+γ. This consequently will increase the temperature of the photons. The net effect to the lowest order is an increase in the ratio of the photon temperature to the neutrino temperature. The magnitude of energy loss of the neutrino is ∼10-4-10-5 MeV for the probability of conversion of νe → νi (i = μ,τ) between 0 to 1.0.

APA, Harvard, Vancouver, ISO, and other styles

8

Saez, M. M., O. Civitarese, and M. E. Mosquera. "Neutrino-induced reactions in core-collapse supernovae: Effects on the electron fraction." International Journal of Modern Physics D 27, no. 12 (September 2018): 1850116. http://dx.doi.org/10.1142/s021827181850116x.

Full text

Abstract:

Neutrino-induced reactions are a basic ingredient in astrophysical processes like star evolution. The existence of neutrino oscillations affects the rate of nuclear electroweak decays which participates in the chain of events that determines the fate of the star. Among the processes of interest, the production of heavy elements in core-collapse supernovae is strongly dependent upon neutrino properties, like the mixing between different species of neutrinos. In this work, we study the effects of neutrino oscillations upon the electron fraction as a function of the neutrino mixing parameters, for two schemes: the [Formula: see text]-scheme (one active neutrino and one sterile neutrino) and the [Formula: see text]-scheme (two active neutrinos and one sterile neutrino). We have performed this analysis considering a core-collapse supernovae and determined the physical conditions needed to activate the nuclear reaction chains involved in the r-process. We found that the interactions of the neutrinos with matter and among themselves and the initial amount of sterile neutrinos in the neutrino-sphere might change the electron fraction, therefore affecting the onset of the r-process. We have set constrains on the active-sterile neutrino mixing parameters. They are the square-mass-difference [Formula: see text], the mixing angle [Formula: see text], and the hindrance factor [Formula: see text] for the occupation of sterile neutrinos. The calculations have been performed for different values of [Formula: see text], which is the fraction of [Formula: see text]-particles. For [Formula: see text] the r-process is taking place if [Formula: see text], [Formula: see text] and [Formula: see text]. For larger values of [Formula: see text] the region of parameters is strongly reduced. The present results are compared to results available in the literature.

APA, Harvard, Vancouver, ISO, and other styles

9

Park, Mu-In, and Young-Jai Park. "Investigation on the Tachyonic Neutrino." Modern Physics Letters A 12, no. 28 (September 14, 1997): 2103–14. http://dx.doi.org/10.1142/s0217732397002156.

Full text

Abstract:

According to the experimental data, it is still controversial whether the neutrinos, especially the electron–neutrino and muon–neutrino, can be considered as the fermionic spinorial tachyons, and there is still no reliable report on the existence of the right-handed neutrinos. In this letter, we show that only the neutrinos with both handedness can be the tachyons, while the single handedness neutrinos are impossible to be the tachyons. Several implications of this result are discussed.

APA, Harvard, Vancouver, ISO, and other styles

10

Basak, R., and V. I. Tsifrinovich. "Electron capture beta decay of partially polarized nuclei." Modern Physics Letters A 34, no. 17 (June 7, 2019): 1950129. http://dx.doi.org/10.1142/s0217732319501293.

Full text

Abstract:

In this paper, we compute the spin excess for the neutrinos radiated in the process of electron capture beta decay of partially polarized nuclei. The results of computation are presented for the [Formula: see text] nuclei polarized by the strong hyperfine field in a ferromagnetic substance. This system was suggested as a possible source of monoenergetic neutrino radiation with a preferable direction of neutrino propagation. We directly compute the spin excess of radiated neutrinos and show that it is slightly greater than that estimated previously under simplifying assumptions.

APA, Harvard, Vancouver, ISO, and other styles

11

Miramonti, Lino. "Neutrino Physics and Astrophysics with the JUNO Detector." Universe 4, no. 11 (November 16, 2018): 126. http://dx.doi.org/10.3390/universe4110126.

Full text

Abstract:

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator multi-purpose underground detector, under construction near the Chinese city of Jiangmen, with data collection expected to start in 2021. The main goal of the experiment is the neutrino mass hierarchy determination, with more than three sigma significance, and the high-precision neutrino oscillation parameter measurements, detecting electron anti-neutrinos emitted from two nearby (baseline of about 53 km) nuclear power plants. Besides, the unprecedented liquid scintillator-type detector performance in target mass, energy resolution, energy calibration precision, and low-energy threshold features a rich physics program for the detection of low-energy astrophysical neutrinos, such as galactic core-collapse supernova neutrinos, solar neutrinos, and geo-neutrinos.

APA, Harvard, Vancouver, ISO, and other styles

12

Faessler, Amand, Rastislav Hodák, Sergey Kovalenko, and Fedor Šimkovic. "Can one measure the Cosmic Neutrino Background?" International Journal of Modern Physics E 26, no. 01n02 (January 2017): 1740008. http://dx.doi.org/10.1142/s0218301317400080.

Full text

Abstract:

The Cosmic Microwave Background (CMB) yields information about our Universe at around 380,000 years after the Big Bang (BB). Due to the weak interaction of the neutrinos with matter, the Cosmic Neutrino Background (CNB) should give information about a much earlier time of our Universe, around one second after the BB. Probably, the most promising method to “see” the CNB is the capture of the electron neutrinos from the Background by Tritium, which then decays into 3He and an electron with the energy of the the [Formula: see text]-value [Formula: see text] 18.562[Formula: see text]keV plus the electron neutrino rest mass. The “KArlsruhe TRItium Neutrino” (KATRIN) experiment, which is in preparation, seems presently the most sensitive proposed method for measuring the electron antineutrino mass. At the same time, KATRIN can also look by the reaction [Formula: see text]. The capture of the Cosmic Background Neutrinos (CNB) should show in the electron spectrum as a peak by the electron neutrino rest mass above [Formula: see text]. Here, the possibility to see the CNB with KATRIN is studied. A detection of the CNB by KATRIN seems not to be possible at the moment. But KATRIN should be able to determine an upper limit for the local electron neutrino density of the CNB.

APA, Harvard, Vancouver, ISO, and other styles

13

Faessler, A. "Super-Kamiokande neutrino oscillations and the supersymmetric model." HNPS Proceedings 9 (February 11, 2020): 14. http://dx.doi.org/10.12681/hnps.2773.

Full text

Abstract:

The standard model predicts a ratio of 2 for the number of atmospheric muon to electron neutrinos, while super-Kamiokande and others measure a much smaller value (1.30±0.02 for super-Kamiokande). Super-Kamiokande is also able to measure roughly the direction and the energy of the neutrinos. The zenith-angle dependence for the muon neutrinos suggests that the muon neutrinos oscillate into a third neutrino species, either into the r neutrino or a sterile neutrino. This finding is inves- tigated within the supersymmetric model. The neutrinos mix with the neutralinos, this meaning the wino, the bino and the two higgsinos. The 7 x 7 mass matrix is calculated on the tree level. One finds that the mass matrix has three linearly dependent rows, which means that two masses are zero. They are identified with the two lightest neutrino masses. The fit of the super-Kamiokande data to oscillations between three neutrinos yields, together with the result of supersymmetry, that the third neutrino mass lies between 2x10^-2 and 10^-1 eV. The two lightest neutrino masses are in supersymmetry on the tree level zero. The averaged electron neutrino mass which is the essential parameter in the neutrinoless double-beta decay is given by {m_ve) ~ m_v3 P_ze < 0.8 x10^-2 eV (95% confidence limit). It is derived from the super-Kamiokande data in this supersymmetric model to be two orders smaller than the best value (1 eV) from the neutrinoless double-beta decay.

APA, Harvard, Vancouver, ISO, and other styles

14

Nagakura, Hiroki. "Retrieval of energy spectra for all flavours of neutrinos from core-collapse supernova with multiple detectors." Monthly Notices of the Royal Astronomical Society 500, no. 1 (October 23, 2020): 319–32. http://dx.doi.org/10.1093/mnras/staa3287.

Full text

Abstract:

ABSTRACT We present a new method by which to retrieve energy spectrum for all falvours of neutrinos from core-collapse supernova (CCSN). In the retrieval process, we do not assume any analytic formulas to express the energy spectrum of neutrinos but rather take a direct way of spectrum reconstruction from the observed data; the singular value decomposition algorithm with a newly developed adaptive energy-gridding technique is adopted. We employ three independent reaction channels having different flavour sensitivity to neutrinos. Two reaction channels, inverse beta decay on proton and elastic scattering on electrons, from a water Cherenkov detector such as Super-Kamiokande (SK) and Hyper-Kamiokande (HK), and a charged current reaction channel with Argon from the Deep Underground Neutrino Experiment (DUNE) are adopted. Given neutrino oscillation models, we iteratively search the neutrino energy spectra at the CCSN source until they provide the consistent event counts in the three reaction channels. We test the capability of our method by demonstrating the spectrum retrieval to a theoretical neutrino data computed by our recent three-dimensional CCSN simulation. Although the energy spectrum with either electron-type or electron-type antineutrinos at the CCSN source has relatively large error compared to that of other species, the joint analysis with HK + DUNE or SK + DUNE will provide precise energy spectrum of all flavours of neutrinos at the source. Finally, we discuss perspectives for improvements of our method by using neutrino data of other detectors.

APA, Harvard, Vancouver, ISO, and other styles

15

Khruschov, V. V., and S. V. Fomichev. "Sterile neutrinos influence on oscillation characteristics of active neutrinos at short distances in the generalized model of neutrino mixing." International Journal of Modern Physics A 34, no. 29 (October 20, 2019): 1950175. http://dx.doi.org/10.1142/s0217751x19501756.

Full text

Abstract:

A phenomenological model with active and sterile neutrinos is used for calculations of neutrino oscillation characteristics at the normal mass hierarchy of active neutrinos. Taking into account the contributions of sterile neutrinos, appearance and survival probabilities for active neutrinos are calculated. Modified graphical dependencies for the probability of appearance of electron neutrinos/antineutrinos in muon neutrino/antineutrino beams as a function of the ratio of the distance to the neutrino energy and other model parameters are obtained. It is shown that in the case of a certain type mixing between active and sterile neutrinos it is possible to describe all anomalies of neutrino data at short distances with the same model parameters. A new parametrization for a particular type mixing matrix of active and sterile neutrinos that takes into account the additional sources of CP violation is used. The comparison with the existing experimental data is performed and, using this knowledge, the estimates of some model parameters are found. The theoretical results obtained for mixing of active and sterile neutrinos can be applied for interpretation and prediction of results of ground-based experiments on search of sterile neutrinos as well as for the analysis of some astrophysical data.

APA, Harvard, Vancouver, ISO, and other styles

16

Antusch, Stefan, and Oliver Fischer. "Testing sterile neutrino extensions of the Standard Model at the Circular Electron Positron Collider." International Journal of Modern Physics A 30, no. 23 (August 19, 2015): 1544004. http://dx.doi.org/10.1142/s0217751x15440042.

Full text

Abstract:

Extending the Standard Model with sterile (“right-handed”) neutrinos is one of the best motivated ways to account for the observed neutrino masses. We discuss the expected sensitivity of the Circular Electron Positron Collider (CEPC) for testing such extensions. An interesting scenario is given by symmetry protected seesaw models, which theoretically allow for sterile neutrino masses around the electroweak scale with up to order one mixings with the active (SM) neutrinos. When the masses of the sterile neutrinos are well above the electroweak scale, they affect precision data via effective non-unitarity of the leptonic mixing matrix in a model independent way. The expected improvement of the electroweak precision observables from the CEPC may allow to test mixings between active and sterile neutrinos down to [Formula: see text] (using currently discussed CEPC performance parameters). For sterile neutrinos with masses around the electroweak scale, direct searches are possible. Such tests are given by the search for sterile neutrino decays at the [Formula: see text] pole, by deviations from the SM cross section for four leptons at and beyond the [Formula: see text] threshold, and by Higgs boson production and decays. The expected sensitivities at the CEPC could reach down to mixings as small as [Formula: see text].

APA, Harvard, Vancouver, ISO, and other styles

17

Yang, Guang. "The status of the Double Chooz experiment." International Journal of Modern Physics: Conference Series 31 (January 2014): 1460299. http://dx.doi.org/10.1142/s2010194514602993.

Full text

Abstract:

Double Chooz is a long baseline neutrino oscillation experiment at Chooz, France. The purpose of this experiment is to measure the non-zero neutrino oscillation parameter θ13, a parameter for changing electron neutrinos into other neutrinos. This experiment uses reactors of the Chooz Nuclear Power Plant as a neutrino source. Double Chooz has published two papers with results showing the measurement of the mixing angle, and 3rd publication is processing.

APA, Harvard, Vancouver, ISO, and other styles

18

Warren, Mackenzie L., Grant J. Mathews, Matthew Meixner, Jun Hidaka, and Toshitaka Kajino. "Impact of sterile neutrino dark matter on core-collapse supernovae." International Journal of Modern Physics A 31, no. 25 (September 8, 2016): 1650137. http://dx.doi.org/10.1142/s0217751x16501372.

Full text

Abstract:

We summarize the impact of sterile neutrino dark matter on core-collapse supernova explosions. We explore various oscillations between electron neutrinos or mixed [Formula: see text] neutrinos and right-handed sterile neutrinos that may occur within a core-collapse supernova. In particular, we consider sterile neutrino masses and mixing angles that are consistent with sterile neutrino dark matter candidates as indicated by recent X-ray flux measurements. We find that the interpretation of the observed 3.5 keV X-ray excess as due to a decaying 7 keV sterile neutrino that comprises 100% of the dark matter would have almost no observable effect on supernova explosions. However, in the more realistic case in which the decaying sterile neutrino comprises only a small fraction of the total dark matter density due to the presence of other sterile neutrino flavors, WIMPs, etc. a larger mixing angle is allowed. In this case a 7 keV sterile neutrino could have a significant impact on core-collapse supernovae. We also consider mixing between [Formula: see text] neutrinos and sterile neutrinos. We find, however, that this mixing does not significantly alter the explosion and has no observable effect on the neutrino luminosities at early times.

APA, Harvard, Vancouver, ISO, and other styles

19

NG, DANIEL, and JOHN N. NG. "A NOTE ON MAJORANA NEUTRINOS, LEPTONIC CKM AND ELECTRON ELECTRIC DIPOLE MOMENT." Modern Physics Letters A 11, no. 03 (January 30, 1996): 211–16. http://dx.doi.org/10.1142/s0217732396000254.

Full text

Abstract:

The electric dipole moment of the electron, de, is known to vanish up to three-loop in the standard model with massless neutrinos. However, if neutrinos are massive Majorana particles, we obtain the result that de induced by leptonic CKM mechanism is nonvanishing at two-loop order, and it applies to all massive Majorana neutrino models.

APA, Harvard, Vancouver, ISO, and other styles

20

Antusch, Stefan, Eros Cazzato, and Oliver Fischer. "Sterile neutrino searches at future e−e+, pp and e−p colliders." International Journal of Modern Physics A 32, no. 14 (May 19, 2017): 1750078. http://dx.doi.org/10.1142/s0217751x17500786.

Full text

Abstract:

Sterile neutrinos are among the most attractive extensions of the SM to generate the light neutrino masses observed in neutrino oscillation experiments. When the sterile neutrinos are subject to a protective symmetry, they can have masses around the electroweak scale and potentially large neutrino Yukawa couplings, which makes them testable at planned future particle colliders. We systematically discuss the production and decay channels at electron–positron, proton–proton and electron–proton colliders and provide a complete list of the leading order signatures for sterile neutrino searches. Among other things, we discuss several novel search channels, and present a first look at the possible sensitivities for the active-sterile mixings and the heavy neutrino masses. We compare the performance of the different collider types and discuss their complementarity.

APA, Harvard, Vancouver, ISO, and other styles

21

Halzen, Francis. "IceCube and the discovery of high-energy cosmic neutrinos." International Journal of Modern Physics D 25, no. 14 (December 2016): 1630028. http://dx.doi.org/10.1142/s0218271816300287.

Full text

Abstract:

By transforming a cubic kilometer of natural Antarctic ice into a neutrino detector, the IceCube project created the opportunity to observe cosmic neutrinos. We describe the experiment and the complementary methods presently used to study the flux of the recently discovered cosmic neutrinos. In one method, events are selected in which neutrinos interacted inside the instrumented volume of the detector, yielding a sample of events dominated by neutrinos of electron and tau flavor. Alternatively, another method detects secondary muons produced by neutrinos selected for having traveled through the Earth to reach the detector, providing a pure sample of muon neutrinos. We will summarize the results obtained with the enlarged data set collected since the initial discovery and appraise the current status of high-energy neutrino astronomy. The large extragalactic neutrino flux observed points to a nonthermal universe with comparable energy in neutrinos, gamma rays and cosmic rays. Continued observations may be closing in on the source candidates. In this context, we highlight the potential of multimessenger analyses as well as the compelling case for constructing a next-generation detector larger in volume by one order of magnitude.

APA, Harvard, Vancouver, ISO, and other styles

22

LYUBOSHITZ, VALERY V., and VLADIMIR L. LYUBOSHITZ. "LEPTON MIXING UNDER THE LEPTON CHARGE NONCONSERVATION, NEUTRINO MASSES AND OSCILLATIONS AND THE "FORBIDDEN" DECAY μ- → e- + γ." International Journal of Modern Physics: Conference Series 35 (January 2014): 1460394. http://dx.doi.org/10.1142/s2010194514603949.

Full text

Abstract:

The lepton-charge (Le, Lμ, Lτ) nonconserving interaction leads to the mixing of the electron, muon and tau neutrinos, which manifests itself in spatial oscillations of a neutrino beam, and also to the mixing of the electron, negative muon and tau lepton, which, in particular, may be the cause of the "forbidden" radiative decay of the negative muon into the electron and γ quantum. Under the assumption that the nondiagonal elements of the mass matrices for neutrinos and ordinary leptons, connected with the lepton charge nonconservation, are the same, and by performing the joint analysis of the experimental data on neutrino oscillations and experimental restriction for the probability of the decay μ- → e- + γ per unit time, the following estimate for the lower bound of neutrino mass has been obtained: [Formula: see text].

APA, Harvard, Vancouver, ISO, and other styles

23

KLEIN, JOSHUA R. "SOLAR NEUTRINO RESULTS FROM THE SUDBURY NEUTRINO OBSERVATORY." International Journal of Modern Physics A 17, no. 24 (September 30, 2002): 3378–92. http://dx.doi.org/10.1142/s0217751x0201279x.

Full text

Abstract:

We describe here the measurement of the flux of neutrinos created by the decay of solar 8B by the Sudbury Neutrino Observatory (SNO). The neutrinos were detected via the charged current (CC) reaction on deuterium and by the elastic scattering (ES) of electrons. The CC reaction is sensitive exclusively to νe's, while the ES reaction also has a small sensitivity to νμ's and ντ's. The flux of νe's from 8B decay measured by the CC reaction rate is [Formula: see text]. Assuming no flavor transformation, the flux inferred from the ES reaction rate is [Formula: see text]. Comparison of ϕ CC (νe) to the Super-Kamiokande Collaboration's precision value of ϕ ES (νx) yields a 3.3σ difference, assuming the systematic uncertainties are normally distributed, providing evidence that there is non-electron flavor active neutrino component in the solar flux. The total flux of active 8B neutrinos is thus determined to be 5.44 ± 0.99 × 106 cm- 2s- 1, in close agreement with the predictions of solar models.

APA, Harvard, Vancouver, ISO, and other styles

24

Ludhova, L. "Review article "Geo-neutrinos"." Geoscientific Instrumentation, Methods and Data Systems 1, no. 2 (December 10, 2012): 221–27. http://dx.doi.org/10.5194/gi-1-221-2012.

Full text

Abstract:

Abstract. Geo-neutrinos, electron anti-neutrinos produced in β-decays of naturally occurring radioactive isotopes in the Earth, are a unique direct probe of our planet's interior. After a brief introduction about the Earth (mostly for physicists) and the very basics about the neutrinos and anti-neutrinos (mostly for geologists), I describe the geo-neutrino properties and the main aims of their study. An overview of the latest experimental results obtained by KamLAND and Borexino experiments is provided. A short overview of future perspectives of this new inter-disciplinary field is given.

APA, Harvard, Vancouver, ISO, and other styles

25

Antusch, Stefan, Eros Cazzato, and Oliver Fischer. "Higgs production through sterile neutrinos." International Journal of Modern Physics A 31, no. 33 (November 22, 2016): 1644007. http://dx.doi.org/10.1142/s0217751x16440073.

Full text

Abstract:

In scenarios with sterile (right-handed) neutrinos with an approximate “lepton-number-like” symmetry, the heavy neutrinos (the mass eigenstates) can have masses around the electroweak scale and couple to the Higgs boson with, in principle, unsuppressed Yukawa couplings, while the smallness of the light neutrinos’ masses is guaranteed by the approximate symmetry. The on-shell production of the heavy neutrinos at lepton colliders, together with their subsequent decays into a light neutrino and a Higgs boson, constitutes a resonant contribution to the Higgs production mechanism. This resonant mono-Higgs production mechanism can contribute significantly to the mono-Higgs observables at future lepton colliders. A dedicated search for the heavy neutrinos in this channel exhibits sensitivities for the electron neutrino Yukawa coupling as small as [Formula: see text]. Furthermore, the sensitivity is enhanced for higher center-of-mass energies, when identical integrated luminosities are considered.

APA, Harvard, Vancouver, ISO, and other styles

26

Beylin, V., M. Bezuglov, V. Kuksa, E. Tretyakov, and A. Yagozinskaya. "Scattering of high-energy cosmic ray electrons off the Dark Matter." International Journal of Modern Physics A 34, no. 06n07 (March 10, 2019): 1950040. http://dx.doi.org/10.1142/s0217751x19500404.

Full text

Abstract:

High-energy cosmic ray electrons interaction with Dark Matter particles is considered. In particular, a weakening of energy spectrum of cosmic electrons is predicted resulting from inelastic electron scattering on hyperpions in the hypercolor extension of the Standard Model. Corresponding cross-section and angular distributions of secondary neutrino are calculated and studied. The number of events with these neutrinos at IceTop is also estimated.

APA, Harvard, Vancouver, ISO, and other styles

27

ATHAR, H., C. S. KIM, and JAKE LEE. "INTRINSIC AND OSCILLATED ASTROPHYSICAL NEUTRINO FLAVOR RATIOS REVISITED." Modern Physics Letters A 21, no. 13 (April 30, 2006): 1049–65. http://dx.doi.org/10.1142/s021773230602038x.

Full text

Abstract:

The pp interactions taking place in the cosmos around us are a source of the astrophysical neutrinos of all the three flavors. In these interactions, the electron and the muon neutrinos mainly come from the production and the decay of the π± mesons, whereas the tau neutrinos mainly come from the production and the decay of the [Formula: see text] mesons. We estimate the three intrinsic neutrino flavor ratios for 1 GeV ≤E≤1012 GeV in the pp interactions and found them to be 1:2:3×10-5. We study the effects of neutrino oscillations on these intrinsic ratios. We point out that the three ratios become 1:1:1 if L (pc)/E(GeV) ≥10-10 in the presence of neutrino oscillations, where L is the distance to the astrophysical neutrino source in units of parsecs.

APA, Harvard, Vancouver, ISO, and other styles

28

MAJUMDAR, DEBASISH, AMITAVA RAYCHAUDHURI, KAMALES KAR, ALAK RAY, and FIROZA K. SUTARIA. "OSCILLATION EFFECTS ON NEUTRINOS FROM THE EARLY PHASE OF A NEARBY SUPERNOVA." International Journal of Modern Physics A 15, no. 14 (June 10, 2000): 2105–20. http://dx.doi.org/10.1142/s0217751x00000872.

Full text

Abstract:

Recent observations of atmospheric and solar neutrinos strongly support the phenomenon of neutrino oscillations — a manifestation of a nonzero and nondegenerate mass spectrum. Neutrinos emitted during stellar core collapse leading to a supernova are of the electron neutrino type at source — as for solar and reactor (anti-)neutrinos — and provide another useful tool in the search for flavor oscillations. Their propagation to an earth-bound detector involves length scales that can uniquely probe very small neutrino mass differences hitherto unobservable. Although the number of neutrinos emitted during the collapse phase is much smaller than that emitted in the post-bounce epoch (in which all flavors of neutrinos are emitted), a nearby supernova event may nevertheless register a substantial number of detections from the collapse phase at SuperKamiokande (SK) and the Sudbury Neutrino Observatory (SNO). The measurement of the fluence of these neutrinos at SNO and the distortion of the spectrum detected at SK can yield valuable information about neutrino mass difference and mixing which are illustrated here in terms of two- and three-flavor oscillation models. In particular, we find that R SNO , the ratio of the calorimetric detection of the neutrino fluence via the neutral current channel to the total energy integrated fluence observed via the charged current channel at SNO, is a sensitive probe for oscillations. We also find that αn, the ratio of the nth central moments of the distributions seen at SK and SNO (charged current), can be a useful tool (especially for n=3) to look for neutrino oscillations.

APA, Harvard, Vancouver, ISO, and other styles

29

Kang, Sin Kyu. "Roles of sterile neutrinos in particle physics and cosmology." International Journal of Modern Physics A 34, no. 10 (April 10, 2019): 1930005. http://dx.doi.org/10.1142/s0217751x19300059.

Full text

Abstract:

The impacts of the light sterile neutrino hypothesis in particle physics and cosmology are reviewed. The observed short baseline neutrino anomalies challenging the standard explanation of neutrino oscillations within the framework of three active neutrinos are addressed. It is shown that they can be interpreted as the experimental hints pointing towards the existence of sterile neutrino at the eV scale. While the electron neutrino appearance and disappearance data are in favor of such a sterile neutrino, the muon disappearance data disfavor it, which gives rise to a strong appearance–disappearance tension. After a brief review on the cosmological effects of light sterile neutrinos, proposed signatures of light sterile neutrinos in the existing cosmological data are discussed. The keV-scale sterile neutrinos as possible dark matter candidates are also discussed by reviewing different mechanisms of how they can be produced in the early Universe and how their properties can be constrained by several cosmological observations. We give an overview of the possibility that keV-scale sterile neutrino can be a good DM candidate and play a key role in achieving low-scale leptogenesis simultaneously by introducing a model where an extra light sterile neutrino is added on top of type I seesaw model.

APA, Harvard, Vancouver, ISO, and other styles

30

Кочанов, Алексей, Aleksey Kochanov, Анна Морозова, Anna Morozova, Татьяна Синеговская, Tatyana Sinegovskaya, Сергей Синеговский, and Sergey Sinegovskiy. "Behaviour of the high-energy neutrino flux in the Earth’s atmosphere." Solnechno-Zemnaya Fizika 1, no. 4 (December 17, 2015): 3–10. http://dx.doi.org/10.12737/13514.

Full text

Abstract:

The processing of the IceCube experiment data, obtained during 988 days (2010-2013), revealed 37 high-energy neutrino-induced events with deposited energies 30 TeV - 2 PeV. The hypothesis of an astrophysical origin of these neutrinos is confirmed at the statistical confidence level of 5.7 standard deviations. To identify reliably the neutrino events, a thorough calculation of the atmospheric neutrino background is required. In this work we calculate the atmospheric neutrino spectra in the energy range 100 GeV - 10 PeV with usage of several hadronic models and a few parametrizations of the cosmic ray spectra, supported by experimental data, which take into account the knee. It is shown that rare decays of short-lived neutral каоns K0_s contribute more than a third of the total electron neutrino flux at the energies above 100 ТeV. The account for kaons production in pion-nucleus collisions increases the electron neutrino flux by 5-7 % in the energy range 10^2 -10^4 GeV. Calculated neutrino spectra agree on the whole with the measurement data. The neutrino flavor ratio, extracted from the IceCube data, possibly indicates that the conventional atmospheric electron neutrino flux obtained in the IceCube experiment contains an admixture of the astrophysical neutrinos in the range 20 − 50 TeV.

APA, Harvard, Vancouver, ISO, and other styles

31

Minakata, H., and C. Peña-Garay. "Solar Neutrino Observables Sensitive to Matter Effects." Advances in High Energy Physics 2012 (2012): 1–15. http://dx.doi.org/10.1155/2012/349686.

Full text

Abstract:

We discuss constraints on the coefficientAMSWwhich is introduced to simulate the effect of weaker or stronger matter potential for electron neutrinos with the current and future solar neutrino data. The currently available solar neutrino data leads to a boundAMSW=1.47+0.54−0.42(+1.88−0.82)at 1σ(3σ) CL, which is consistent with the Standard Model predictionAMSW=1. For weaker matter potential (AMSW<1), the constraint which comes from the flat8B neutrino spectrum is already very tight, indicating the evidence for matter effects. However for stronger matter potential (AMSW>1), the bound is milder and is dominated by the day-night asymmetry of8B neutrino flux recently observed by Super-Kamiokande. Among the list of observables of ongoing and future solar neutrino experiments, we find that (1) an improved precision of the day-night asymmetry of8B neutrinos, (2) precision measurements of the low-energy quasi-monoenergetic neutrinos, and (3) the detection of the upturn of the8B neutrino spectrum at low energies are the best choices to improve the bound onAMSW.

APA, Harvard, Vancouver, ISO, and other styles

32

MALIK, ADAM. "νee(elastic) from LSND." International Journal of Modern Physics A 16, supp01b (September 2001): 749–51. http://dx.doi.org/10.1142/s0217751x01007984.

Full text

Abstract:

A measurement of the cross section for the elastic scattering of electron neutrinos on electrons was performed using the data collected with the Liquid Scintillator Neutrino Detector (LSND) at LANL. This cross section was calculated to be (10.0±1.1±1.1)× E ν×10-45 cm 2 and is used to determine the destructive interference term between the neutral-current and charged-current interactions for this reaction.

APA, Harvard, Vancouver, ISO, and other styles

33

Stanev, Todor. "Atmospheric neutrinos: Muon and electron neutrinos problem." Nuclear Physics B - Proceedings Supplements 48, no. 1-3 (May 1996): 165–71. http://dx.doi.org/10.1016/0920-5632(96)00232-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

BELLERIVE, A. "REVIEW OF SOLAR NEUTRINO EXPERIMENTS." International Journal of Modern Physics A 19, no. 08 (March 30, 2004): 1167–79. http://dx.doi.org/10.1142/s0217751x04019093.

Full text

Abstract:

This paper reviews the constraints on the solar neutrino mixing parameters with data collected by the Homestake, SAGE, GALLEX, Kamiokande, SuperKamiokande, and SNO experiments. An emphasis will be given to the global solar neutrino analyses in terms of matter-enhanced oscillation of two active flavors. The results to-date, including both solar model dependent and independent measurements, indicate that electron neutrinos are changing to other active types on route to the Earth from the Sun. The total flux of solar neutrinos is found to be in very good agreement with solar model calculations. Future measurements will focus on greater accuracy for mixing parameters and on better sensitivity to low neutrino energies.

APA, Harvard, Vancouver, ISO, and other styles

35

Daywitt, William C. "The Neutrino Decay of the Free Neutron and the Neutrino Structure According to the Planck Vacuum Theory." European Journal of Engineering and Technology Research 6, no. 5 (July 27, 2021): 73–75. http://dx.doi.org/10.24018/ejers.2021.6.5.2524.

Full text

Abstract:

The Planck vacuum (PV) theory derives equations for the neutrino and antineutrino, and relates them to the unstable free neutron and antineutron. Remarkably, these neu- trons and neutrinos share the same wavefunction solutions that describe the proton and electron and their antiparticle cores. The neutrino and antineutrino are chargeless and massless; so their propagation through matter goes unnoticed, making these neutrinos invisible. The equations to follow that describe these pseudo-particles are the theoretical embodiment of the circa 1930 Pauli neutrino hypothesis. Finally, depending on one’s perspective, the neutrons can be viewed as decaying meta-particles or as stable nuclear particles.

APA, Harvard, Vancouver, ISO, and other styles

36

Dragoun, Otokar, and Drahoslav Vénos. "Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future1." Open Physics Journal 3, no. 1 (September 30, 2016): 73–113. http://dx.doi.org/10.2174/1874843001603010073.

Full text

Abstract:

Although neutrinos are probably the most abundant fermions of the universe their mass is not yet known. Oscillation experiments have proven that at least one of the neutrino mass states hasmi> 0.05 eV while various interpretations of cosmological observations yielded an upper limit for the sum of neutrino masses ∑mi< (0.14 ‒ 1.7) eV. The searches for the yet unobserved 0νββ decay result in an effective neutrino massmββ< (0.2 ‒ 0.7) eV. The analyses of measured tritium β-spectra provide an upper limit for the effective electron neutrino massm(ve) < 2 eV. In this review, we summarize the experience of two generations of β-ray spectroscopists who improved the upper limit ofm(ve) by three orders of magnitude. We describe important steps in the development of radioactive sources and electron spectrometers, and recapitulate the lessons from now-disproved claims for the neutrino mass of 30 eV and the 17 keV neutrino with an admixture larger than 0.03%. We also pay attention to new experimental approaches and searches for hypothetical sterile neutrinos.

APA, Harvard, Vancouver, ISO, and other styles

37

Moreno, O., E. Moya de Guerra, and M. Ramón Medrano. "Warm Dark Matter Sterile Neutrinos in Electron Capture and Beta Decay Spectra." Advances in High Energy Physics 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/6318102.

Full text

Abstract:

We briefly review the motivation to search for sterile neutrinos in the keV mass scale, as dark matter candidates, and the prospects to find them in beta decay or electron capture spectra, with a global perspective. We describe the fundamentals of the neutrino flavor-mass eigenstate mismatch that opens the possibility of detecting sterile neutrinos in such ordinary nuclear processes. Results are shown and discussed for the effect of heavy neutrino emission in electron capture in Holmium 163 and in two isotopes of Lead, 202 and 205, as well as in the beta decay of Tritium. We study the deexcitation spectrum in the considered cases of electron capture and the charged lepton spectrum in the case of Tritium beta decay. For each of these cases, we define ratios of integrated transition rates over different regions of the spectrum under study and give new results that may guide and facilitate the analysis of possible future measurements, paying particular attention to forbidden transitions in Lead isotopes.

APA, Harvard, Vancouver, ISO, and other styles

38

CLARK, T. E., and S. T. LOVE. "MUONIUM–ANTIMUONIUM OSCILLATIONS AND MASSIVE MAJORANA NEUTRINOS." Modern Physics Letters A 19, no. 04 (February 10, 2004): 297–306. http://dx.doi.org/10.1142/s0217732304013143.

Full text

Abstract:

The electron and muon number violating muonium–antimuonium oscillation process can proceed provided that neutrinos have nonzero masses and mix among the various generations. Modifying the Standard Model only by the inclusion of singlet right-handed neutrino fields and allowing for general neutrino masses and mixings, the leading order matrix element contributing to this process is computed. For the particularly interesting case where the neutrino masses are generated by a seesaw mechanism with a very large Majorana mass MR≫MW, it is found that both the very light and very heavy Majorana neutrinos each give comparable contributions to the oscillation time scale proportional to [Formula: see text]. Present experimental limits set by the non-observation of the oscillation process sets a lower limit on MR of roughly of order 104 GeV.

APA, Harvard, Vancouver, ISO, and other styles

39

Saez, M. M., O. Civitarese, and M. E. Mosquera. "Neutrino mixing in nuclear rapid neutron-capture processes." International Journal of Modern Physics E 29, no. 04 (April 2020): 2050022. http://dx.doi.org/10.1142/s0218301320500226.

Full text

Abstract:

A possible mechanism for the formation of heavy-mass elements in supernovae is the rapid neutron-capture-mechanism ([Formula: see text]-process). It depends upon the electron-fraction [Formula: see text], a quantity which is determined by beta-decay-rates. In this paper, we focus on the calculation of electroweak decay-rates in presence of massive neutrinos. The resulting expressions are then used to calculate nuclear reactions entering the rapid-neutron capture. We fix the astrophysical parameters to the case of a core-collapse supernova. The neutrino sector includes a mass scheme and mixing angles for active neutrinos, and also by including the mixing between active and sterile neutrinos. The results of the calculations show that the predicted abundances of heavy-mass nuclei are indeed affected by the neutrino mixing.

APA, Harvard, Vancouver, ISO, and other styles

40

Boyarkin, O. M., and I. O. Boyarkina. "Solar neutrinos as indicators of the Sun’s activity." International Journal of Modern Physics A 34, no. 33 (November 30, 2019): 1950227. http://dx.doi.org/10.1142/s0217751x19502270.

Full text

Abstract:

Opportunity of the solar flares (SFs) prediction observing the solar neutrino fluxes is investigated. In three neutrino generations, the evolution of the neutrino flux traveling the coupled sunspots (CSs) which are the SF source is considered. It is assumed that the neutrinos possess both the dipole magnetic moment and the anapole moment while the magnetic field above the CSs may reach the values [Formula: see text] Gs, display the twisting nature and posses the nonpotential character. The possible resonance conversions of the solar neutrino flux are examined. Since the [Formula: see text] resonance takes place before the convective zone, its existence can in no way be connected with the SF. However, when the solar neutrino flux moves through the CSs in the preflare period, then it may undergo the additional resonance conversions and, as a result, depleting the electron neutrinos flux may be observed.

APA, Harvard, Vancouver, ISO, and other styles

41

Consolati, Giovanni, D. Franco, and D. Trezzi. "Positronium Formation and Decay in Organic Scintillators for Neutrino Detection." Materials Science Forum 733 (November 2012): 306–9. http://dx.doi.org/10.4028/www.scientific.net/msf.733.306.

Full text

Abstract:

The detection of electron anti-neutrinos is generally carried out by searching for the coincidence of the reaction products, neutron and positron, in liquid scintillators. However, in these last a positron may form positronium (Ps) with an electron of the medium; efficiency of the process may be high. Furthermore, the triplet ground state sublevel (o-Ps) has lifetimes of a few ns. These features introduce distortions in the time distribution of the emitted photons, which is essential for position reconstruction and pulse shape discrimination algorithms in anti-neutrino experiments. This drawback can be favorably exploited by using o-Ps as a probe to detect anti-neutrinos in the scintillator. We report results of positron annihilation lifetime measurements in some organic liquid scintillators used for neutrino experiments. The o-Ps induced distortion of the scintillation photon emission time distribution may enhance the anti-neutrino detection.

APA, Harvard, Vancouver, ISO, and other styles

42

Yilmaz, Deniz. "Combined Effect of NSI and SFP on Solar Electron Neutrino Oscillation." Advances in High Energy Physics 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/1435191.

Full text

Abstract:

The combined effect of spin-flavor precession (SFP) and the nonstandard neutrino interaction (NSI) on the survival probability of solar electron neutrinos (assumed to be Dirac particles) is examined for various values ofϵ11,ϵ12, andμB. It is found that the neutrino survival probability curves affected by SFP and NSI effects individually for some values of the parameters (ϵ11,ϵ12, andμB) get close to the standard MSW curve when both effects are combined. Therefore, the combined effect of SFP and NSI needs to be taken into account when the solar electron neutrino data obtained by low energy solar neutrino experiments is investigated.

APA, Harvard, Vancouver, ISO, and other styles

43

SATO, JOE. "MONOENERGETIC NEUTRINO BEAM FOR LONG BASELINE EXPERIMENTS." International Journal of Modern Physics E 16, no. 05 (June 2007): 1331–47. http://dx.doi.org/10.1142/s0218301307006708.

Full text

Abstract:

In an electron capture process by a nucleus, emitted neutrinos are monoenergetic. We study a long baseline experiment with such a completely monoenergetic neutrino beam. This talk is based on Refs. 1 and 2.

APA, Harvard, Vancouver, ISO, and other styles

44

MA, ERNEST. "PATTERN OF THE APPROXIMATE MASS DEGENERACY OF MAJORANA NEUTRINOS." Modern Physics Letters A 17, no. 05 (February 20, 2002): 289–94. http://dx.doi.org/10.1142/s0217732302006412.

Full text

Abstract:

In view of the recently reported evidence for a nonzero Majorana mass of the electron neutrino, together with the established phenomena of atmospheric and solar neutrino oscillations, the case of three nearly mass-degenerate Majorana neutrinos is now an interesting possibility. We show in this paper how a natural pattern of symmetry breaking in the recently proposed A4 model of Majorana neutrino masses can accommodate the data on neutrino oscillations, resulting in the predictions sin 2 2θ atm = 1 and sin 2 2θ sol = 2/3.

APA, Harvard, Vancouver, ISO, and other styles

45

BETHE, H. A. "SOLAR NEUTRINOS." International Journal of Modern Physics D 01, no. 01 (January 1992): 1–12. http://dx.doi.org/10.1142/s0218271892000021.

Full text

Abstract:

Solar neutrinos have been measured by a radioactive scheme involving 37 Cl , and by electron collisions at Kamiokande II. The former experiment gave 1/4, the latter 1/2 of the intensity expected from the standard solar model. Kamiokande showed that the central temperature from the standard model is at least approximately correct. Both experiments can be explained by the Mikheyev-Smirnov-Wolfenstein (MSW) theory, and they show the mass of the μ neutrino to be of order 10−3 eV . Preliminary results from an experiment using 71 Ga confirm the conclusions.

APA, Harvard, Vancouver, ISO, and other styles

46

Balantsev, Ilya, and Alexander Studenikin. "From electromagnetic neutrinos to new electromagnetic radiation mechanism in neutrino fluxes." International Journal of Modern Physics A 30, no. 17 (June 20, 2015): 1530044. http://dx.doi.org/10.1142/s0217751x15300446.

Full text

Abstract:

A massive neutrino has nonzero magnetic moment and is involved in the electromagnetic interactions with external fields and photons. The electromagnetic neutrino moving in matter can emit the spin light [Formula: see text] in the process of transition between two quantum states in matter. In quite resembling way an electron can emit spin light in moving background composed of neutrinos, that is “the spin light of an electron in neutrino flux” [Formula: see text]. In this paper we obtain the exact solution for the wave function and energy spectrum for an electron moving in a neutrino flux and consider the [Formula: see text] as the transition process between two electron quantum states in the background. The [Formula: see text] radiation rate, power and emitted photon energy are calculated. Notably, the energy spectrum of the emitted [Formula: see text] photons can span up to gamma-rays. We argue that the considered [Formula: see text] can be of interest for astrophysical applications, for supernovae processes in particular.

APA, Harvard, Vancouver, ISO, and other styles

47

Caliskan, A. "Excited Neutrino Search Potential of the FCC-Based Electron-Hadron Colliders." Advances in High Energy Physics 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/4726050.

Full text

Abstract:

The production potential of the excited neutrinos at the FCC-based electron-hadron colliders, namely, the ERL60⊗FCC with s=3.46 TeV, the ILC⊗FCC with s=10 TeV, and the PWFA-LC⊗FCC with s=31.6 TeV, has been analyzed. The branching ratios of the excited neutrinos have been calculated for the different decay channels and shown that the dominant channel is ν⋆→eW+. We have calculated the production cross sections with the process of ep→ν⋆q→eW+q and the decay widths of the excited neutrinos with the process of ν⋆→eW+. The signals and corresponding backgrounds are studied in detail to obtain accessible mass limits. It is shown that the discovery limits obtained on the mass of the excited neutrino are 2452 GeV for Lint=100 fb-1, 5635 GeV for Lint=10 fb-1 (6460 GeV for Lint=100 fb-1), and 10200 GeV for Lint=1 fb-1 (13960 GeV for Lint=10 fb-1), for the center-of-mass energies of 3.46, 10, and 31.6 TeV, respectively.

APA, Harvard, Vancouver, ISO, and other styles

48

Aartsen, Mark, Markus Ackermann, Jenni Adams, Juan Antonio Aguilar, Markus Ahlers, Maryon Ahrens, Imen Al Samarai, et al. "Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A." Science 361, no. 6398 (July 12, 2018): eaat1378. http://dx.doi.org/10.1126/science.aat1378.

Full text

Abstract:

Previous detections of individual astrophysical sources of neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neutrinos remain unidentified. On 22 September 2017, we detected a high-energy neutrino, IceCube-170922A, with an energy of ~290 tera–electron volts. Its arrival direction was consistent with the location of a known γ-ray blazar, TXS 0506+056, observed to be in a flaring state. An extensive multiwavelength campaign followed, ranging from radio frequencies to γ-rays. These observations characterize the variability and energetics of the blazar and include the detection of TXS 0506+056 in very-high-energy γ-rays. This observation of a neutrino in spatial coincidence with a γ-ray–emitting blazar during an active phase suggests that blazars may be a source of high-energy neutrinos.

APA, Harvard, Vancouver, ISO, and other styles

49

Sobków, W. "Right-handed neutrinos in low-energy neutrino–electron scattering." Physics Letters B 555, no. 3-4 (March 2003): 215–26. http://dx.doi.org/10.1016/s0370-2693(03)00050-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Bahcall, John N., Marc Kamionkowski, and Alberto Sirlin. "Solar neutrinos: Radiative corrections in neutrino-electron scattering experiments." Physical Review D 51, no. 11 (June 1, 1995): 6146–58. http://dx.doi.org/10.1103/physrevd.51.6146.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Electron neutrinos'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles