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Статті в журналах з теми "Lepton number"

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Автор: Grafiati

Опубліковано: 14 березня 2023

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1

Christos, GA. "Bound on the Number of Flavours." Australian Journal of Physics 38, no. 1 (1985): 23. http://dx.doi.org/10.1071/ph850023.

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Анотація:

If one imposes the permutation symmetry S. (n is the number of lepton flavours) reducibly on. the different families (e, /1, r, ... ), it follows that at least two leptons have the same mass if n > 6. If equal lepton masses are excluded, this implies a bound on the number of flavours.

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2

ROBSON, B. A. "A GENERATION MODEL OF THE FUNDAMENTAL PARTICLES." International Journal of Modern Physics E 11, no. 06 (December 2002): 555–66. http://dx.doi.org/10.1142/s0218301302001125.

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Анотація:

A new classification of the fundamental particles based upon the use of only three additive quantum numbers (charge, particle number, generation quantum number) compared with the nine additive quantum numbers of the Standard Model (charge, lepton number, muon lepton number, tau lepton number, baryon number, strangeness, charm, bottomness, topness) is presented. This classification provides a new basis for the weak isospin symmetry characteristic of both leptons and quarks.

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3

KLAPDOR-KLEINGROTHAUS, H. V., ERNEST MA, and UTPAL SARKAR. "BARYON AND LEPTON NUMBER VIOLATION WITH SCALAR BILINEARS." Modern Physics Letters A 17, no. 33 (October 30, 2002): 2221–28. http://dx.doi.org/10.1142/s0217732302008757.

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Анотація:

We consider all possible scalar bilinears, which couple to two fermions of the standard model. The various baryon and lepton number violating couplings allowed by these exotic scalars are studied. We then discuss which are constrained by limits on proton decay (to a lepton and a meson as well as to three leptons), neutron–antineutron oscillations, and neutrinoless double beta decay.

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4

López Castro, G., and N. Quintero. "Lepton number violation in tau lepton decays." Nuclear Physics B - Proceedings Supplements 253-255 (August 2014): 12–15. http://dx.doi.org/10.1016/j.nuclphysbps.2014.09.004.

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5

ROSEN, GERALD. "IS LEPTON-QUARK MASS PRESET BY A CHARGE-NUMBER RELATION?" Modern Physics Letters A 11, no. 20 (June 28, 1996): 1687–89. http://dx.doi.org/10.1142/s0217732396001673.

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Анотація:

It is shown that a simple expression for m that depends exclusively on the charge-number Q gives experimentally admissible zero mass for the three neutrinos and accurately consistent mass values for the charged leptons and quarks over the five order-of-magnitude range characterized by the ratio mt/me≅3.6×105. Since this charge-number relation is patently predictive, with 12 fermion masses constituting substantial output relative to the postulational input, lepton and quark mass may indeed be preset by this charge-number condition. Hence, lepton-quark mass may actually be primary to the phenomenological standard model Lagrangian.

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6

FALCONE, D. "LEPTON NUMBER AND LEPTON FLAVOR VIOLATIONS IN SEESAW MODELS." Modern Physics Letters A 17, no. 37 (December 7, 2002): 2467–75. http://dx.doi.org/10.1142/s0217732302009180.

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Анотація:

We discuss the impact of fermion mass matrices on some lepton number violating processes, namely baryogenesis via leptogenesis and neutrinoless double beta decay, and on some lepton flavor violating processes, namely radiative lepton decays in supersymmetric seesaw models.

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7

Adeva, B. "Lepton Number Violation and Lepton Flavour Violation at LHCb." Journal of Physics: Conference Series 447 (July 24, 2013): 012062. http://dx.doi.org/10.1088/1742-6596/447/1/012062.

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8

Yoshimura, M. "B-L genesis by sliding inflaton." Journal of Cosmology and Astroparticle Physics 2022, no. 08 (August 1, 2022): 080. http://dx.doi.org/10.1088/1475-7516/2022/08/080.

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Abstract We propose a new mechanism of lepton (L) number asymmetry generation, hence offer an explanation of matter-antimatter imbalance when a significant amount of baryon number is later transformed from this L-number by known electroweak sphaleron mediated process. The basic theoretical framework is a recently proposed multiple scalar-tensor gravity that dynamically solves the cosmological constant problem. The L-asymmetry generation in one of two proposed scenarios is triggered by dynamical relaxation of scalar inflaton field towards the zero cosmological constant. CPT violation (C = charge conjugation, P = parity operation, T = time reversal) in the presence of a chemical potential gives the necessary time arrow, and lepton number violating scattering in cosmic thermal medium generates a net cosmological L-number via resonance formation. Another scenario is L-asymmetry generation from evaporating primordial black holes. These proposed mechanisms do not require CP violating phases in physics beyond the standard model: the new required physics is existence of heavy Majorana leptons of masses 1015 ∼ 1017 GeV that realizes the seesaw mechanism. We identify the cosmological epoch of lepto-genesis in two scenarios, which may give the right amount of observed baryon to entropy ratio. It might even be possible to experimentally determine microscopic physics parameter, masses of three heavy Majorana leptons by observing astrophysical footprints of primordial black hole evaporation at specified hole masses.

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9

Witten, Edward. "Lepton number and neutrino masses." Nuclear Physics B - Proceedings Supplements 91, no. 1-3 (January 2001): 3–8. http://dx.doi.org/10.1016/s0920-5632(00)00916-6.

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10

Plümacher, Michael. "Baryogenesis and lepton number violation." Zeitschrift f�r Physik C Particles and Fields 74, no. 3 (May 1, 1997): 549–59. http://dx.doi.org/10.1007/s002880050418.

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11

Costa, G., and F. Zwirner. "Baryon and lepton number nonconservation." La Rivista Del Nuovo Cimento Series 3 9, no. 3 (March 1986): 1–134. http://dx.doi.org/10.1007/bf02724479.

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12

COTTI, UMBERTO, RICARDO GAITÁN, A. HERNÁNDEZ-GALEANA, WILLIAM A. PONCE, and ARNULFO ZEPEDA. "LEPTON MASS GENERATION AND FAMILY NUMBER VIOLATION MECHANISM IN THE SU(6)L⊗ U(1)Y MODEL." International Journal of Modern Physics A 13, no. 32 (December 30, 1998): 5557–72. http://dx.doi.org/10.1142/s0217751x98002535.

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Анотація:

Lepton family number violation processes arise in the SU(6) L⊗ U(1) Y model due to the presence of an extra neutral gauge boson, Z′, with family changing couplings, and due to the fact that this model demands the existence of heavy exotic leptons. The mixing of the standard Z with Z′ and the mixing of ordinary leptons with exotic ones induce together family changing couplings on the Z and therefore nonvanishing rates for lepton family number violation processes, such as [Formula: see text], [Formula: see text] and μ→eγ. Additional contributions to the processes μ→eγ and [Formula: see text] are induced from the mass generation mechanism. This last type of contributions may compete with the above one, depending on the masses of the scalars which participate in the diagrams which generate radiatively the masses of the charged leptons. Using the experimental data we compute some bounds for the mixings parameters and for the masses of the scalars.

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13

KOLB, EDWARD W., and MICHAEL S. TURNER. "ELECTROWEAK ANOMALY AND LEPTON ASYMMETRY." Modern Physics Letters A 02, no. 05 (May 1987): 285–91. http://dx.doi.org/10.1142/s0217732387000392.

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It has recently been pointed out that shortly after the electroweak phase transition (t≃10−11 sec , T≃100–200 GeV ) there was a period of very effective baryon (and lepton) number violation driven by non-perturbative effects arising from the electroweak anomaly. Here we argue that as a result of these electroweak interactions the total asymmetry in leptons must be equal and opposite to the baryon asymmetry: L≡∑iLi=Le+Lμ+Lr=−B. Since the individual lepton numbers can be positive or negative, this does not preclude any large individual contribution, i.e., |Li|>B. This fact has important consequences for primordial nucleosynthesis if |Li|≳1.

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14

Helo, Juan Carlos, Sergey Kovalenko, and Ivan Schmidt. "Sterile neutrinos in lepton number and lepton flavor violating decays." Nuclear Physics B 853, no. 1 (December 2011): 80–104. http://dx.doi.org/10.1016/j.nuclphysb.2011.07.020.

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15

Fornal, Bartosz. "Dark matter and baryogenesis from non-Abelian gauged lepton number." Modern Physics Letters A 32, no. 19 (June 4, 2017): 1730018. http://dx.doi.org/10.1142/s021773231730018x.

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Анотація:

A simple model is constructed based on the gauge symmetry [Formula: see text], with only the leptons transforming nontrivially under [Formula: see text]. The extended symmetry is broken down to the Standard Model gauge group at TeV-scale energies. We show that this model provides a mechanism for baryogenesis via leptogenesis in which the lepton number asymmetry is generated by [Formula: see text] instantons. The theory also contains a dark matter candidate — the [Formula: see text] partner of the right-handed neutrino.

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16

KRASNIKOV, N. V. "FLAVOR LEPTON NUMBER VIOLATION AT LEP2." Modern Physics Letters A 09, no. 09 (March 21, 1994): 791–94. http://dx.doi.org/10.1142/s0217732394000617.

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Анотація:

We show that in some supersymmetric models with explicit flavor number violation due to soft supersymmetry breaking terms there is strong flavor lepton number violation in slepton decays due to slepton mixing. If sleptons are relatively light (m sl ≤ MZ) flavor lepton number violation could be discovered at LEP2.

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17

NISHIURA, HIROYUKI, KOUICHI MATSUDA, and TAKESHI FUKUYAMA. "CONSTRAINTS OF MIXING ANGLES FROM LEPTON NUMBER VIOLATING PROCESSES." Modern Physics Letters A 14, no. 06 (February 28, 1999): 433–45. http://dx.doi.org/10.1142/s0217732399000493.

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We discuss the constraints of lepton mixing angles from lepton number violating processes such as neutrinoless double beta decay, μ--e+ conversion and K decay, K-→π+μ-μ- which are allowed only if neutrinos are Majorana particles. The rates of these processes are proportional to the averaged neutrino mass defined by [Formula: see text] in the absence of right-handed weak coupling. Here a, b(j) are flavor(mass) eigenstates and Uaj is the left-handed lepton mixing matrix. We give general conditions imposed on <mν>ab in terms of mi, lepton mixing angles and CP violating phases (three phases in Majorana neutrinos). These conditions are reduced to the constraints among mi, lepton mixing angles and <mν>ab which are irrelevant to the concrete values of CP phases. Given a <mν>ab experimentally, these conditions constrain mi and the lepton mixing angles. Though these constraints are still loose except for neutrinoless double beta decay, they will become helpful through rapid improvements of experiments. By using these constraints we also derive the limits on averaged neutrino masses for μ--e+ conversion and K decay, K-→π+μ-μ-, respectively. We also present the bounds for CP phases in terms of mi, mixing angles and <mν>ab.

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18

Khanji, Basem. "Searches for lepton flavour violation and lepton number violation at LHCb." Nuclear Physics B - Proceedings Supplements 248-250 (March 2014): 91–96. http://dx.doi.org/10.1016/j.nuclphysbps.2014.02.016.

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19

Albrecht, H., U. Binder, P. Böckmann, R. Gläser, G. Harder, I. Lembke-Koppitz, W. Schmidt-Parzefall, et al. "Search for lepton-number and lepton-flavour violation in tau decays." Physics Letters B 185, no. 1-2 (February 1987): 228–32. http://dx.doi.org/10.1016/0370-2693(87)91560-7.

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20

Minucci, Elisa. "Searches for Lepton Flavour and Lepton Number violation in K+ decays." Nuclear and Particle Physics Proceedings 318-323 (November 2022): 165–69. http://dx.doi.org/10.1016/j.nuclphysbps.2022.11.002.

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21

Mainland, Gordon Bruce, and Bernard Mulligan. "The Speed of Light Predicts the Number of Lepton Families." Universe 8, no. 3 (February 27, 2022): 150. http://dx.doi.org/10.3390/universe8030150.

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Анотація:

Vacuum fluctuations of charged particles appear in the vacuum as particle-antiparticle pairs so that quantum numbers such as charge, baryon number, and lepton number are conserved. To minimize the violation of conservation of energy and conserve angular momentum, the pair appears in the most tightly bound state that has zero angular momentum. The permittivity ϵ0 of the vacuum results primarily from bound, charged lepton-charged antilepton vacuum fluctuations that are polarized by photons traveling in the vacuum. The formula for ϵ0 depends on the number NL of lepton families but is independent of the charged lepton masses. The formula for the speed c of light in the vacuum is obtained from c=1/μ0ϵ0, where μ0 is the permeability of the vacuum. The formula for c is shown to depend on the number NL of lepton families. The calculated value of c agrees with the defined value when NL=2.92.

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22

Päs, Heinrich. "Cosmological implications of lepton number violation." International Journal of Modern Physics A 33, no. 31 (November 10, 2018): 1844017. http://dx.doi.org/10.1142/s0217751x18440177.

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The abundances of baryons and leptons are not only closely related to each other and to the generation of neutrino masses but may also be linked to the dark matter in the Universe. In this paper we review how a consistent physics beyond the Standard Model framework for cosmology and neutrino masses could arise by studying these interrelations.

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23

Paschos, Emmanuel A., Utpal Sarkar, and Hiroto So. "Baryon and lepton number assignment inE6models." Physical Review D 52, no. 3 (August 1, 1995): 1701–5. http://dx.doi.org/10.1103/physrevd.52.1701.

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24

Banks, Tom, Yuval Grossman, Enrico Nardi, and Yosef Nir. "Supersymmetry withoutRparity and without lepton number." Physical Review D 52, no. 9 (November 1, 1995): 5319–25. http://dx.doi.org/10.1103/physrevd.52.5319.

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25

Dobroliubov, M. I., and A. Yu Ignatiev. "Lepton number nonconservation in supersymmetric theories." Zeitschrift für Physik C Particles and Fields 43, no. 2 (June 1989): 267–72. http://dx.doi.org/10.1007/bf01588214.

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26

FELIPE, R. GONZÁLEZ, F. R. JOAQUIM, and H. SERÔDIO. "FLAVORED CP ASYMMETRIES FOR TYPE II SEESAW LEPTOGENESIS." International Journal of Modern Physics A 28, no. 31 (December 19, 2013): 1350165. http://dx.doi.org/10.1142/s0217751x13501650.

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Анотація:

A novel contribution to the leptonic CP asymmetries in type II seesaw leptogenesis scenarios is obtained for the cases in which flavor effects are relevant for the dynamics of leptogenesis. In the so-called flavored leptogenesis regime, the interference between the tree-level amplitude of the scalar triplet decaying into two leptons and the one-loop wave function correction with leptons in the loop, leads to a new nonvanishing CP asymmetry contribution. The latter conserves total lepton number but violates lepton flavor. Cases in which this novel contribution may be dominant in the generation of the baryon asymmetry are briefly discussed.

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27

Harz, Julia, Wei-Chih Huang, and Heinrich Päs. "Lepton number violation and the baryon asymmetry of the universe." International Journal of Modern Physics A 30, no. 17 (June 20, 2015): 1530045. http://dx.doi.org/10.1142/s0217751x15300458.

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Анотація:

Neutrinoless double beta decay, lepton number violating collider processes and the Baryon Asymmetry of the Universe (BAU) are intimately related. In particular, lepton number violating processes at low energies in combination with sphaleron transitions will typically erase any preexisting BAU. In this contribution, we briefly review the tight connection between neutrinoless double beta decay, lepton number violating processes at the LHC and constraints from successful baryogenesis. We argue that far-reaching conclusions can be drawn unless the baryon asymmetry is stabilized via some newly introduced mechanism.

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28

BILENKY, S. M., and C. GIUNTI. "LEPTON NUMBERS IN THE FRAMEWORK OF NEUTRINO MIXING." International Journal of Modern Physics A 16, no. 24 (September 30, 2001): 3931–49. http://dx.doi.org/10.1142/s0217751x01004967.

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Анотація:

In this short review we discuss the notion of lepton numbers. The strong evidence in favor of neutrino oscillations obtained recently in the super-Kamiokande atmospheric neutrino experiment and in solar neutrino experiments imply that the law of conservation of family lepton numbers Le, Lμ and Lτ is strongly violated. We consider the states of flavor neutrinos νe, νμ and ντ and we discuss the evolution of these states in space and time in the case of nonconservation of family lepton numbers due to the mixing of light neutrinos. We discuss and compare different flavor neutrino discovery experiments. We stress that experiments on the search for νμ→ντ and νe→ντ oscillations demonstrated that the flavor neutrino ντ is a new type of neutrino, different from νe and νμ. In the case of neutrino mixing, the lepton number (only one) is connected with the nature of massive neutrinos. Such a conserved lepton number exists if massive neutrinos are Dirac particles. We review possibilities to check in future experiments whether the conserved lepton number exists.

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29

Ilakovac, A. "Probing lepton-number and lepton-flavor violation in semileptonicτdecays into two mesons". Physical Review D 54, № 9 (1 листопада 1996): 5653–73. http://dx.doi.org/10.1103/physrevd.54.5653.

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30

Miyazaki, Y., K. Hayasaka, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev та ін. "Search for lepton-flavor and lepton-number-violating τ→ℓhh′ decay modes". Physics Letters B 719, № 4-5 (лютий 2013): 346–53. http://dx.doi.org/10.1016/j.physletb.2013.01.032.

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31

Benavides, Richard H., Luis N. Epele, Huner Fanchiotti, Carlos García Canal, and William A. Ponce. "Lepton Number Violation and Neutrino Masses in 3-3-1 Models." Advances in High Energy Physics 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/813129.

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Анотація:

Lepton number violation and its relation to neutrino masses are investigated in several versions of theSU3c⊗SU3L⊗U1xmodel. Spontaneous and explicit violation and conservation of the lepton number are considered. In one of the models (the so-called economical one), the lepton number is spontaneously violated and it is found that the would be Majoron is not present because it is gauged away, providing in this way the longitudinal polarization component to a now massive gauge field.

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32

Miyazaki, Y., H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura та ін. "Search for lepton flavor and lepton number violating τ decays into a lepton and two charged mesons". Physics Letters B 682, № 4-5 (січень 2010): 355–62. http://dx.doi.org/10.1016/j.physletb.2009.11.061.

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33

Kawasaki, Masahiro, and Kai Murai. "Lepton asymmetric universe." Journal of Cosmology and Astroparticle Physics 2022, no. 08 (August 1, 2022): 041. http://dx.doi.org/10.1088/1475-7516/2022/08/041.

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Abstract The recent observation of 4He implies that our universe has a large lepton asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number generation. In the AD mechanism, non-topological solitons called L-balls are produced, and the generated lepton number is confined in them. The L-balls protect the generated lepton number from being converted to baryon number through the sphaleron processes. We study the formation and evolution of the L-balls and find that the universe with large lepton asymmetry suggested by the recent 4He measurement can be realized.

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34

Koide, Yoshio, and Hiroyuki Nishiura. "Quark and lepton mass matrices described by charged lepton masses." Modern Physics Letters A 31, no. 20 (June 28, 2016): 1650125. http://dx.doi.org/10.1142/s021773231650125x.

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Анотація:

Recently, we proposed a unified mass matrix model for quarks and leptons, in which, mass ratios and mixings of the quarks and neutrinos are described by using only the observed charged lepton mass values as family-number-dependent parameters and only six family-number-independent free parameters. In spite of quite few parameters, the model gives remarkable agreement with observed data (i.e. Cabibbo–Kobayashi–Maskawa (CKM) mixing, Pontecorvo–Maki–Nakagawa–Sakata (PMNS) mixing and mass ratios). Taking this phenomenological success seriously, we give a formulation of the so-called Yukawaon model in detail from a theoretical aspect, especially for the construction of superpotentials and R charge assignments of fields. The model is considerably modified from the previous one, while the phenomenological success is kept unchanged.

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35

Jerhot, Jan. "Searches for lepton flavour and lepton number violating K ⁺ decays at the NA62 experiment." Journal of Physics: Conference Series 2446, no. 1 (February 1, 2023): 012022. http://dx.doi.org/10.1088/1742-6596/2446/1/012022.

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Abstract The NA62 experiment at CERN collected the world’s largest dataset of charged kaon decays to di-lepton final states in 2016-2018, using dedicated trigger lines. Upper limits on the rates of several K + decays violating lepton flavour and lepton number conservation, obtained by analysing this dataset, are reported.

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36

Harada, Junpei. "Hypercharge and baryon minus lepton number inE6." Journal of High Energy Physics 2003, no. 04 (April 7, 2003): 011. http://dx.doi.org/10.1088/1126-6708/2003/04/011.

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37

Allanach, B. C., and C. H. Kom. "Lepton number violating mSUGRA and neutrino masses." Journal of High Energy Physics 2008, no. 04 (April 22, 2008): 081. http://dx.doi.org/10.1088/1126-6708/2008/04/081.

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38

Hirsch, M. "Neutrinos, lepton number violation and the LHC." Nuclear and Particle Physics Proceedings 265-266 (August 2015): 296–301. http://dx.doi.org/10.1016/j.nuclphysbps.2015.06.075.

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39

Chang, Darwin, W. Y. Keung, and Palash B. Pal. "Spontaneous Lepton-Number Breaking at Electroweak Scale." Physical Review Letters 61, no. 21 (November 21, 1988): 2420–23. http://dx.doi.org/10.1103/physrevlett.61.2420.

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40

Dobroliubov, M. I., and A. Yu Ignatiev. "Nonconservation of lepton number in supersymmetric theories." Physics Letters B 221, no. 3-4 (May 1989): 333–36. http://dx.doi.org/10.1016/0370-2693(89)91719-x.

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41

Cortina Gil, E., A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, et al. "Searches for lepton number violating K+ decays." Physics Letters B 797 (October 2019): 134794. http://dx.doi.org/10.1016/j.physletb.2019.07.041.

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42

Maalampi, J., and N. Romanenko. "Testing lepton number violation with the reaction." Physics Letters B 474, no. 3-4 (February 2000): 347–54. http://dx.doi.org/10.1016/s0370-2693(00)00034-4.

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43

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Анотація:

Lepton flavor violating (LFV) decays are forbidden in the Standard Model (SM) and to explore them one has to go beyond it. The flavor changing neutral current induced lepton flavor conserving and LFV decays of [Formula: see text] and [Formula: see text] mesons is discussed in the gauge group [Formula: see text]. The lepto-quark [Formula: see text] corresponding to gauge group [Formula: see text] allows the quark–lepton transitions and hence giving a framework to construct the effective Lagrangian for the LFV decays. The mass of lepto-quark [Formula: see text] provides a scale at which the gauge group [Formula: see text] is broken to the SM gauge group. Using the most stringent experimental limit [Formula: see text], the upper bound on the effective coupling constant [Formula: see text] is obtained for certain pairing of lepton and quark generations in the representation [Formula: see text] of the group [Formula: see text]. Later, the effective Lagrangian for the LFV meson decays for the gauge group [Formula: see text] is constructed. Using [Formula: see text], the bound on the ratio of effective couplings is obtained to be [Formula: see text]. A number of decay modes are discussed which provide a promising area to test this model in the current and future particle physics experiments.

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