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Journal articles on the topic 'Resonant leptogenesis'

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Published: 30 November 2024

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1

Pilaftsis, Apostolos, and Thomas E. J. Underwood. "Resonant leptogenesis." Nuclear Physics B 692, no. 3 (August 2004): 303–45. http://dx.doi.org/10.1016/j.nuclphysb.2004.05.029.

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2

Simone, Andrea De, and Antonio Riotto. "On resonant leptogenesis." Journal of Cosmology and Astroparticle Physics 2007, no. 08 (August 15, 2007): 013. http://dx.doi.org/10.1088/1475-7516/2007/08/013.

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3

Dev, P. S. B., M. Garny, J. Klaric, P. Millington, and D. Teresi. "Resonant enhancement in leptogenesis." International Journal of Modern Physics A 33, no. 05n06 (February 28, 2018): 1842003. http://dx.doi.org/10.1142/s0217751x18420034.

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Vanilla leptogenesis within the type I seesaw framework requires the mass scale of the right-handed neutrinos to be above [Formula: see text] GeV. This lower bound can be avoided if at least two of the sterile states are almost mass degenerate, which leads to an enhancement of the decay asymmetry. Leptogenesis models that can be tested in current and upcoming experiments often rely on this resonant enhancement, and a systematic and consistent description is therefore necessary for phenomenological applications. In this paper, we give an overview of different methods that have been used to study the saturation of the resonant enhancement when the mass difference becomes comparable to the characteristic width of the Majorana neutrinos. In this limit, coherent flavor transitions start to play a decisive role, and off-diagonal correlations in flavor space have to be taken into account. We compare various formalisms that have been used to describe the resonant regime and discuss under which circumstances the resonant enhancement can be captured by simplified expressions for the CP asymmetry. Finally, we briefly review some of the phenomenological aspects of resonant leptogenesis.
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4

Kashiwase, Shoichi, Hiroshi Okada, Yuta Orikasa, and Takashi Toma. "Two loop neutrino model with dark matter and leptogenesis." International Journal of Modern Physics A 31, no. 20n21 (July 27, 2016): 1650121. http://dx.doi.org/10.1142/s0217751x16501219.

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In this paper, we study a two-loop induced radiative neutrino model at TeV scale with global [Formula: see text] symmetry, in which we analyze dark matter and resonant leptogenesis. The model includes two kinds of dark matter candidates. We discuss what kind of dark matter can satisfy the observed relic density as well as the current direct detection bound, and be simultaneously compatible with the leptogenesis. We also discuss whether our resonant leptogenesis can be differentiated from the other scenarios at TeV scale or not.
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5

Dev, P. S. Bhupal, Peter Millington, Apostolos Pilaftsis, and Daniele Teresi. "Flavour Covariant Formalism for Resonant Leptogenesis." Nuclear and Particle Physics Proceedings 273-275 (April 2016): 268–74. http://dx.doi.org/10.1016/j.nuclphysbps.2015.09.037.

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6

Anisimov, A., A. Broncano, and M. Plümacher. "The CP-asymmetry in resonant leptogenesis." Nuclear Physics B 737, no. 1-2 (March 2006): 176–89. http://dx.doi.org/10.1016/j.nuclphysb.2006.01.003.

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7

Garbrecht, Björn, Florian Gautier, and Juraj Klaric. "Strong washout approximation to resonant leptogenesis." Journal of Cosmology and Astroparticle Physics 2014, no. 09 (September 18, 2014): 033. http://dx.doi.org/10.1088/1475-7516/2014/09/033.

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8

Zhang, Jue, and Shun Zhou. "Neutrinos and cosmological matter–antimatter asymmetry: A minimal seesaw with Frampton–Glashow–Yanagida ansatz." International Journal of Modern Physics A 32, no. 16 (June 8, 2017): 1742004. http://dx.doi.org/10.1142/s0217751x17420040.

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In light of the latest neutrino data, we revisit a minimal seesaw model with the Frampton–Glashow–Yanagida ansatz. Renormalization-group running effects on neutrino masses and flavor mixing parameters are discussed and found to essentially have no impact on testing such a minimal scenario in low-energy neutrino experiments. However, since renormalization-group running can modify neutrino mixing parameters at high energies, it does affect the leptogenesis mechanism, which is responsible for the observed matter–antimatter asymmetry in our Universe. Furthermore, to ease the conflict between the naturalness argument and the successful leptogenesis, a special regime for resonant leptogenesis is also emphasized.
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9

Granelli, A., K. Moffat, and S. T. Petcov. "Flavoured resonant leptogenesis at sub-TeV scales." Nuclear Physics B 973 (December 2021): 115597. http://dx.doi.org/10.1016/j.nuclphysb.2021.115597.

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10

Hambye, Thomas, John March-Russell, and Stephen M. West. "TeV scale resonant leptogenesis from supersymmetry breaking." Journal of High Energy Physics 2004, no. 07 (July 28, 2004): 070. http://dx.doi.org/10.1088/1126-6708/2004/07/070.

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11

Hohenegger, Andreas. "Quantum and medium effects in (resonant) leptogenesis." Journal of Physics: Conference Series 485 (March 24, 2014): 012038. http://dx.doi.org/10.1088/1742-6596/485/1/012038.

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12

KANG, SIN KYU, and C. S. KIM. "EXTENDED DOUBLE SEESAW MODEL AND LOW SCALE LEPTOGENESIS." International Journal of Modern Physics E 16, no. 05 (June 2007): 1505–12. http://dx.doi.org/10.1142/s0218301307006848.

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We propose a variant of seesaw mechanism by introducing extra singlet neutrinos, with which we show how the low scale leptogenesis is realized without imposing the tiny mass splitting between two heavy Majorana neutrinos required in the resonant leptogenesis. Thus, the so-called gravitino problem encountered in the typical supersymmetric seesaw model can be avoided. It is showed that an introduction of the new singlet fermion leads to a new contribution which can enhance the lepton asymmetry for certain range of parameter space.
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13

Dev, P. S. B., P. Di Bari, B. Garbrecht, S. Lavignac, P. Millington, and D. Teresi. "Flavor effects in leptogenesis." International Journal of Modern Physics A 33, no. 05n06 (February 28, 2018): 1842001. http://dx.doi.org/10.1142/s0217751x18420010.

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Flavor effects can have a significant impact on the final estimate of the lepton (and therefore baryon) asymmetry in scenarios of leptogenesis. It is therefore necessary to account fully for this flavor dynamics in the relevant transport equations that describe the production (and washout) of the asymmetry. Doing so can both open up and restrict viable regions of parameter space relative to the predictions of more approximate calculations. In this paper, we identify the regimes in which flavor effects can be relevant and illustrate their impact in a number of phenomenological models. These include type I and type II seesaw embeddings, and low-scale resonant scenarios. In addition, we provide an overview of the semi-classical and field-theoretic methods that have been developed to capture flavor effects in a consistent way.
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14

Kasai, Kentaro, Masahiro Kawasaki, and Kai Murai. "Affleck-Dine leptogenesis scenario for resonant production of sterile neutrino dark matter." Journal of Cosmology and Astroparticle Physics 2024, no. 08 (August 1, 2024): 008. http://dx.doi.org/10.1088/1475-7516/2024/08/008.

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Abstract Sterile neutrino is a fascinating candidate for dark matter. In this paper, we examine the Affleck-Dine (AD) leptogenesis scenario generating a large lepton asymmetry, which can induce the resonant production of sterile neutrino dark matter via the Shi-Fuller (SF) mechanism. We also revisit the numerical calculation of the SF mechanism and the constraints from current X-ray and Lyman-α forest observations. We find that the AD leptogenesis scenario can explain the production of sterile neutrino dark matter by incorporating a non-topological soliton with a lepton charge called L-ball. Finally, we discuss an enhancement of second-order gravitational waves at the L-ball decay and investigate the testability of our scenario with future gravitational wave observations.
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15

Chakraborty, Indrani, Himadri Roy, and Tripurari Srivastava. "Resonant leptogenesis in (2,2) inverse see-saw realisation." Nuclear Physics B 979 (June 2022): 115780. http://dx.doi.org/10.1016/j.nuclphysb.2022.115780.

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16

Cirigliano, Vincenzo, Andrea De Simone, Gino Isidori, Isabella Masina, and Antonio Riotto. "Quantum resonant leptogenesis and minimal lepton flavour violation." Journal of Cosmology and Astroparticle Physics 2008, no. 01 (January 4, 2008): 004. http://dx.doi.org/10.1088/1475-7516/2008/01/004.

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17

Aoki, M., N. Haba, and R. Takahashi. "A model realizing inverse seesaw and resonant leptogenesis." Progress of Theoretical and Experimental Physics 2015, no. 11 (November 11, 2015): 113B03. http://dx.doi.org/10.1093/ptep/ptv149.

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18

Garny, Mathias, Alexander Kartavtsev, and Andreas Hohenegger. "Leptogenesis from first principles in the resonant regime." Annals of Physics 328 (January 2013): 26–63. http://dx.doi.org/10.1016/j.aop.2012.10.007.

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19

SCOPEL, STEFANO. "LEPTOGENESIS AND QUINTESSENTIAL KINATION." Modern Physics Letters A 23, no. 17n20 (June 28, 2008): 1624–28. http://dx.doi.org/10.1142/s0217732308028028.

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We show how thermal leptogenesis induced by the CP-violating decay of a right-handed neutrino (RHN) can be compatible to the assumption of quintessential kination, i.e., to a cosmological background model where the energy density of the early Universe is assumed to be dominated by the kinetic term of a quintessence field during some epoch of its evolution. The phenomenology depends on the temperature Tr above which kination dominates over radiation. We show that for some choice of Tr not far from the RHN mass M, M/100 < Tr < M, the efficiency for leptogenesis can be even larger than in the standard scenario of radiation domination. On the other hand, when Tr ≪ M a super-weak wash-out regime is attained, with a strong suppression of the efficiency. In this case successful leptogenesis depends sensitively on ΔL = 1 scattering processes and requires a resonant CP violation effect of order unity. Moreover, the condition Tr > 5 MeV (M/TeV) (0.05 eV/m) must be verified, with m the effective neutrino mass scale.
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20

WEST, STEPHEN M. "NEUTRINO MASSES AND TeV SCALE RESONANT LEPTOGENESIS FROM SUPERSYMMETRY BREAKING." Modern Physics Letters A 21, no. 21 (July 10, 2006): 1629–46. http://dx.doi.org/10.1142/s0217732306021153.

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We review a class of supersymmetric models in which the light neutrino masses result from higher-dimensional supersymmetry-breaking terms in the MSSM super- and Kähler-potentials. The mechanism used in these models is closely related to the Giudice–Masiero mechanism for the MSSM μ parameter and leads to TeV-scale right-handed neutrino and sneutrino states. In these models, the dominant contribution to the light neutrino (Majorana) mass matrix is a one-loop term with a sub-dominant tree-level "seesaw" contribution. It is also shown that it is possible to construct a natural model of TeV-scale leptogenesis via the resonant behavior of the one-loop self-energy contribution to the right-handed neutrino (Ni) decay. This model addresses the primary problems of previous phenomenological studies of low-energy leptogenesis: a rational for TeV-scale right-handed neutrinos with small Yukawa couplings; the origin of the tiny, but non-zero mass splitting required between at least two Ni masses; and the necessary non-trivial breaking of flavor symmetries in the right-handed neutrino sector.
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21

Dev, P. S. Bhupal, Peter Millington, Apostolos Pilaftsis, and Daniele Teresi. "Flavour covariant transport equations: An application to resonant leptogenesis." Nuclear Physics B 886 (September 2014): 569–664. http://dx.doi.org/10.1016/j.nuclphysb.2014.06.020.

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22

Xing, Zhi-zhong, and Shun Zhou. "Tri-bimaximal neutrino mixing and flavor-dependent resonant leptogenesis." Physics Letters B 653, no. 2-4 (September 2007): 278–87. http://dx.doi.org/10.1016/j.physletb.2007.08.009.

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23

XING, ZHI-ZHONG, and SHUN ZHOU. "THE MINIMAL TYPE-I SEESAW MODEL AND FLAVOR-DEPENDENT LEPTOGENESIS." International Journal of Modern Physics A 23, no. 21 (August 20, 2008): 3403–7. http://dx.doi.org/10.1142/s0217751x08042201.

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In this talk, we first give a brief review of the so-called minimal seesaw models and then concentrate on the minimal type-I seesaw model with two almost degenerate right-handed Majorana neutrinos of [Formula: see text]. A specific texture of the neutrino Yukawa coupling matrix is proposed to achieve the nearly tri-bimaximal neutrino mixing pattern. This ansatz predicts (1) θ23 = π/4, |δ| = π/2 and sin 2θ12 = (1 − 2tan2θ13)/3 in the m1 = 0 case; and (2) θ23 = π/4 and θ13 = 8 = 0 in the m3 = 0 case. In both cases, the cosmological baryon number asymmetry can be explained via the resonant leptogenesis mechanism. Finally, we demonstrate the significance of flavor-dependent effects in our leptogenesis scenario.
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24

BABU, K. S., ABDEL G. BACHRI, and ZURAB TAVARTKILADZE. "PREDICTIVE MODEL OF INVERTED NEUTRINO MASS HIERARCHY AND RESONANT LEPTOGENESIS." International Journal of Modern Physics A 23, no. 11 (April 30, 2008): 1679–96. http://dx.doi.org/10.1142/s0217751x08039761.

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We present a new realization of inverted neutrino mass hierarchy based on [Formula: see text] flavor symmetry. In this scenario, the deviation of the solar oscillation angle from π/4 is correlated with the value of θ13, as they are both induced by a common mixing angle in the charged lepton sector. We find several interesting predictions: θ13≥ 0.13, sin2θ12≥ 0.31, sin2θ23≃ 0.5 and 0 ≤ cos δ ≤ 0.7 for the neutrino oscillation parameters and 0.01 ≲ mββ≲ 0.02 eV for the effective neutrino mass in neutrino-less double β-decay. We show that our scenario can also explain naturally the observed baryon asymmetry of the universe via resonant leptogenesis. The masses of the decaying right-handed neutrinos can be in the range (103–107) GeV, which would avoid the generic gravitino problem of supersymmetric models.
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25

Achelashvili, Avtandil, and Zurab Tavartkiladze. "Texture zero neutrino models and their connection with resonant leptogenesis." Nuclear Physics B 929 (April 2018): 21–57. http://dx.doi.org/10.1016/j.nuclphysb.2018.02.001.

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26

ZHURIDOV, DMITRY V. "NEUTRINO MASSES AND LEPTOGENESIS FROM EXTRA FERMIONS." International Journal of Modern Physics A 28, no. 21 (August 20, 2013): 1350104. http://dx.doi.org/10.1142/s0217751x13501042.

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Generation of the neutrino masses and leptogenesis (LG) in the standard model extended by the heavy Majorana fermions is considered. Classification of LG scenarios according to the new fermion mass spectra is given, where singlet–triplet LG is considered for the first time. The upper bound on the CP asymmetry relevant for LG with hierarchical heavy neutrinos (Davidson–Ibarra bound) is revised, and shown that in the case of one massless neutrino it essentially depends on the type of the light neutrino mass hierarchy. The resonant scenarios, which help to avoid the problem of extremely high reheating temperature in the early universe, are discussed. In particular, we present new simplified, generalized and detailed formulation of freed LG, which violates Davidson–Ibarra bound in a special class of models.
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27

Bhupal Dev, P. S., Peter Millington, Apostolos Pilaftsis, and Daniele Teresi. "Kadanoff–Baym approach to flavour mixing and oscillations in resonant leptogenesis." Nuclear Physics B 891 (February 2015): 128–58. http://dx.doi.org/10.1016/j.nuclphysb.2014.12.003.

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28

Garbrecht, Björn, and Matti Herranen. "Effective theory of Resonant Leptogenesis in the Closed-Time-Path approach." Nuclear Physics B 861, no. 1 (August 2012): 17–52. http://dx.doi.org/10.1016/j.nuclphysb.2012.03.009.

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29

Dev, P. S. Bhupal, Peter Millington, Apostolos Pilaftsis, and Daniele Teresi. "Flavour effects in Resonant Leptogenesis from semi-classical and Kadanoff-Baym approaches." Journal of Physics: Conference Series 631 (July 30, 2015): 012087. http://dx.doi.org/10.1088/1742-6596/631/1/012087.

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30

Racker, J. "Non-resonant leptogenesis in seesaw models with an almost conserved B − L." Hyperfine Interactions 214, no. 1-3 (January 30, 2013): 63–69. http://dx.doi.org/10.1007/s10751-013-0800-2.

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31

GUO, WAN-LEI, ZHI-ZHONG XING, and SHUN ZHOU. "NEUTRINO MASSES, LEPTON FLAVOR MIXING AND LEPTOGENESIS IN THE MINIMAL SEESAW MODEL." International Journal of Modern Physics E 16, no. 01 (January 2007): 1–50. http://dx.doi.org/10.1142/s0218301307004898.

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We present a review of neutrino phenomenology in the minimal seesaw model (MSM), an economical and intriguing extension of the Standard Model with only two heavy right-handed Majorana neutrinos. Given current neutrino oscillation data, the MSM can predict the neutrino mass spectrum and constrain the effective masses of the tritium beta decay and the neutrinoless double-beta decay. We outline five distinct schemes to parameterize the neutrino Yukawa-coupling matrix of the MSM. The lepton flavor mixing and baryogenesis via leptogenesis are investigated in some detail by taking account of possible texture zeros of the Dirac neutrino mass matrix. We derive an upper bound on the CP-violating asymmetry in the decay of the lighter right-handed Majorana neutrino. The effects of the renormalization-group evolution on the neutrino mixing parameters are analyzed, and the correlation between the CP-violating phenomena at low and high energies is highlighted. We show that the observed matter-antimatter asymmetry of the Universe can naturally be interpreted through the resonant leptogenesis mechanism at the TeV scale. The lepton-flavor-violating rare decays, such as μ→e+γ, are also discussed in the supersymmetric extension of the MSM.
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32

Xing, Zhi-zhong, and Di Zhang. "Bridging resonant leptogenesis and low-energy CP violation with an RGE-modified seesaw relation." Physics Letters B 804 (May 2020): 135397. http://dx.doi.org/10.1016/j.physletb.2020.135397.

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33

Barman, Basabendu, Debasish Borah, Suruj Jyoti Das, and Rishav Roshan. "Cogenesis of Baryon asymmetry and gravitational dark matter from primordial black holes." Journal of Cosmology and Astroparticle Physics 2022, no. 08 (August 1, 2022): 068. http://dx.doi.org/10.1088/1475-7516/2022/08/068.

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Abstract We propose a scenario where dark matter (DM) with a wide mass range from a few keV to PeV can be produced solely from evaporating primordial black holes (PBH), while being consistent with the required free streaming length for structure formation. If DM does not have any other interactions apart from gravity and the universe has a PBH dominated phase at early epoch, then PBH evaporation typically leads to overproduction of DM in this mass range. By incorporating this gravitational DM within a Type-I seesaw scenario with three right handed neutrinos (RHN), we bring the abundance of PBH generated DM within observed limits by late entropy injection due to decay of one of the RHNs, acting as the diluter. The diluter, due to its feeble coupling with the bath particles, gets produced primarily from the PBH evaporation thereby leading to the second stage of early matter domination after the end of PBH dominated era. The other two RHNs contribute to the origin of light neutrino mass and also lead to the observed baryon asymmetry via leptogenesis with contributions from both thermally and PBH generated RHNs. The criteria of DM relic and baryon asymmetry can be satisfied simultaneously if DM mass gets restricted to a ballpark in the MeV-GeV regime with the requirement of resonant leptogenesis for heavier DM mass in order to survive the large entropy dilution at late epochs.
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34

Berbig, Maximilian. "S.M.A.S.H.E.D.: Standard Model Axion Seesaw Higgs inflation Extended for Dirac neutrinos." Journal of Cosmology and Astroparticle Physics 2022, no. 11 (November 1, 2022): 042. http://dx.doi.org/10.1088/1475-7516/2022/11/042.

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Abstract Inspired by the S.M.A.S.H. framework we construct a model that addresses the strong CP problem, axion dark matter, inflation and Dirac neutrino masses as well as leptogenesis. The model possesses only two dynamical scales, namely the SM breaking scale vH and the Peccei Quinn (PQ) breaking scale v . We introduce heavy vector-like quarks in the usual KSVZ fashion to implement the PQ mechanism for the strong CP problem. To generate neutrino masses via a dimension six operator scaling as mν ∼ v 3 H / v 2 σ we add heavy triplet and doublet leptons, which are vector-like under the SM but chiral under PQ symmetry. The model is free from the cosmological domain wall problem and predicts an axion to photon coupling which is about an order of magnitude larger than in conventional DFSZ and KSVZ models. Thus our scenario can be probed and potentially excluded by current and next generation axion experiments such as ORGAN or MADMAX. In addition we numerically demonstrate that our construction can generate the observed baryon asymmetry by realizing a version of the Dirac-Leptogenesis scenario. As a consequence of our neutrino mass mechanism we find that the asymmetry in triplet fermion decays can also be significantly enhanced by up to six orders of magnitude when compared to typical Seesaw scenarios without needing to invoke a resonant enhancement. In passing we note that a decaying Dirac fermion with multiple decay modes contains all the necessary ingredients required for the “quasi optimal efficiency”-scenario previously encountered in the context decaying scalar triplets. The impact of the right handed neutrinos and the axion on ΔN eff is estimated and lies within current bounds.
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35

Benaoum, H. B., and S. H. Shaglel. "TeV-scale resonant leptogenesis with new scaling ansatz on neutrino Dirac mass matrix from A4 flavor symmetry." International Journal of Modern Physics A 35, no. 17 (June 12, 2020): 2050077. http://dx.doi.org/10.1142/s0217751x20500773.

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We propose a new scaling ansatz in the neutrino Dirac mass matrix to explain the low energy neutrino oscillations data, baryon number asymmetry and neutrinoless double beta decay. In this work, a full reconstruction of the neutrino Dirac mass matrix has been realized from the low energy neutrino oscillations data based on type-I seesaw mechanism. A concrete model based on [Formula: see text] flavor symmetry has been considered to generate such a neutrino Dirac mass matrix and imposes a relation between the two scaling factors. In this model, the right-handed Heavy Majorana neutrino masses are quasi-degenerate at TeV mass scales. Extensive numerical analysis studies have been carried out to constrain the parameter space of the model from the low energy neutrino oscillations data. It has been found that the parameter space of the Dirac mass matrix elements lies near or below the MeV region and the scaling factor [Formula: see text] has to be less than 10. Furthermore, we have examined the possibility for simultaneous explanation of both neutrino oscillations data and the observed baryon number asymmetry in the Universe. Such an analysis gives further restrictions on the parameter space of the model, thereby explaining the correct neutrino data as well as the baryon number asymmetry via a resonant leptogenesis scenario. Finally, we show that the allowed space for the effective Majorana neutrino mass [Formula: see text] is also constrained in order to account for the observed baryon asymmetry.
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36

Ghosh, Gayatri. "Non-Unitarity in Neutrino mixing matrix and two and three flavored non resonant Leptogenesis from CP violation." Indian Journal of Science and Technology 13, no. 34 (September 12, 2020): 3572–85. http://dx.doi.org/10.17485/ijst/v13i34.643.

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37

Bhupal Dev, P. S., Peter Millington, Apostolos Pilaftsis, and Daniele Teresi. "Corrigendum to “Flavour covariant transport equations: An application to resonant leptogenesis” [Nucl. Phys. B 886 (2014) 569]." Nuclear Physics B 897 (August 2015): 749–56. http://dx.doi.org/10.1016/j.nuclphysb.2015.06.015.

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38

Thapa, Bikash, and Ng K. Francis. "Connecting low-energy CP violation, resonant leptogenesis and neutrinoless double beta decay in a radiative seesaw model." Nuclear Physics B 986 (January 2023): 116054. http://dx.doi.org/10.1016/j.nuclphysb.2022.116054.

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39

Pilaftsis, Apostolos, and Thomas E. J. Underwood. "Electroweak-scale resonant leptogenesis." Physical Review D 72, no. 11 (December 8, 2005). http://dx.doi.org/10.1103/physrevd.72.113001.

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40

Bechinger, Andreas, and Gerhart Seidl. "Resonant Dirac leptogenesis on throats." Physical Review D 81, no. 6 (March 15, 2010). http://dx.doi.org/10.1103/physrevd.81.065015.

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41

Haba, Naoyuki, Osamu Seto, and Yuya Yamaguchi. "Resonant leptogenesis with mild degeneracy." Physical Review D 87, no. 12 (June 28, 2013). http://dx.doi.org/10.1103/physrevd.87.123540.

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42

Blanchet, Steve, Z. Chacko, Solomon S. Granor, and Rabindra N. Mohapatra. "Probing resonant leptogenesis at the LHC." Physical Review D 82, no. 7 (October 25, 2010). http://dx.doi.org/10.1103/physrevd.82.076008.

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43

Zhao, Zhen-hua, Yan Shao, and Hong-Yu Shi. "Consequences of the μ−τ reflection symmetry for leptogenesis in a seesaw model with diagonal Dirac neutrino mass matrix." Physical Review D 109, no. 9 (May 31, 2024). http://dx.doi.org/10.1103/physrevd.109.095047.

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In this paper, we have studied the consequences of the μ−τ reflection symmetry for leptogenesis in the type-I seesaw model with diagonal Dirac neutrino mass matrix. We have first obtained the phenomenologically allowed values of the model parameters, which show that there may exist zero or equal entries in the Majorana mass matrix for the right-handed neutrinos, and then studied their predictions for three right-handed neutrino masses, which show that there may exist two nearly degenerate right-handed neutrinos. Then, we have studied the consequences of the model for leptogenesis. Due to the μ−τ reflection symmetry, leptogenesis can only work in the two-flavor regime. Furthermore, leptogenesis cannot work for the particular case of r=1. Accordingly, for some benchmark values of r≠1, we have given the constraints of leptogenesis for relevant parameters. Furthermore, we have investigated the possibilities of leptogenesis being induced by the renormalization group evolution effects for two particular scenarios. For the particular case of r=1, the renormalization group evolution effects will break the orthogonality relations among different columns of MD and consequently induce leptogenesis to work. For the low-scale resonant leptogenesis scenario which is realized for nearly degenerate right-handed neutrinos, the renormalization group evolution effects can break the μ−τ reflection symmetry and consequently induce leptogenesis to work. Published by the American Physical Society 2024
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44

Jukkala, Henri, Kimmo Kainulainen, and Pyry M. Rahkila. "Flavour mixing transport theory and resonant leptogenesis." Journal of High Energy Physics 2021, no. 9 (September 2021). http://dx.doi.org/10.1007/jhep09(2021)119.

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Abstract We derive non-equilibrium quantum transport equations for flavour-mixing fermions. We develop the formalism mostly in the context of resonant leptogenesis with two mixing Majorana fermions and one lepton flavour, but our master equations are valid more generally in homogeneous and isotropic systems. We give a hierarchy of quantum kinetic equations, valid at different approximations, that can accommodate helicity and arbitrary mass differences. In the mass-degenerate limit the equations take the familiar form of density matrix equations. We also derive the semiclassical Boltzmann limit of our equations, including the CP-violating source, whose regulator corresponds to the flavour coherence damping rate. Boltzmann equations are accurate and insensitive to the particular form of the regulator in the weakly resonant case ∆m » Γ, but for ∆m ≲ Γ they are qualitatively correct at best, and their accuracy crucially depends on the form of the CP-violating source.
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45

Achelashvili, Avtandil, and Zurab Tavartkiladze. "Calculable cosmological CP violation and resonant leptogenesis." Physical Review D 96, no. 1 (July 17, 2017). http://dx.doi.org/10.1103/physrevd.96.015015.

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46

Deppisch, Frank F., and Apostolos Pilaftsis. "Lepton flavor violation andθ13in minimal resonant leptogenesis." Physical Review D 83, no. 7 (April 12, 2011). http://dx.doi.org/10.1103/physrevd.83.076007.

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47

Branco, G. C., R. González Felipe, M. N. Rebelo, and H. Serôdio. "Resonant leptogenesis and tribimaximal leptonic mixing withA4symmetry." Physical Review D 79, no. 9 (May 26, 2009). http://dx.doi.org/10.1103/physrevd.79.093008.

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48

Ghiglieri, J., and M. Laine. "Precision study of GeV-scale resonant leptogenesis." Journal of High Energy Physics 2019, no. 2 (February 2019). http://dx.doi.org/10.1007/jhep02(2019)014.

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49

Candia da Silva, P., D. Karamitros, T. McKelvey, and A. Pilaftsis. "Tri-resonant leptogenesis in a seesaw extension of the Standard Model." Journal of High Energy Physics 2022, no. 11 (November 14, 2022). http://dx.doi.org/10.1007/jhep11(2022)065.

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Abstract We study a class of leptogenesis models where the light neutrinos acquire their observed small masses by a symmetry-motivated construction. This class of models may naturally include three nearly degenerate heavy Majorana neutrinos that can strongly mix with one another and have mass differences comparable to their decay widths. We find that such a tri-resonant heavy neutrino system can lead to leptonic CP asymmetries which are further enhanced than those obtained in the usual bi-resonant approximation. Moreover, we solve the Boltzmann equations by paying special attention to the temperature dependence of the relativistic degrees of freedom of the plasma. The latter results in significant corrections to the evolution equations for the heavy neutrinos and the lepton asymmetry that have been previously ignored in the literature. We show the importance of these corrections to accurately describe the dynamical evolution of the baryon-to-photon ratio ηB for heavy neutrino masses at and below 100 GeV, and demonstrate that successful leptogenesis at lower masses can be significantly affected by the variation of the relativistic degrees of freedom. The parameter space for the leptogenesis model is discussed, and it could be probed in future experimental facilities searching for charged lepton flavour violation and heavy neutrinos in future Z-boson factories.
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50

Liu, Wei, Frank F. Deppisch, and Zixiang Chen. "Testing leptogenesis and seesaw in the B−L model using long-lived particle searches." Physical Review D 110, no. 3 (August 12, 2024). http://dx.doi.org/10.1103/physrevd.110.035017.

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We discuss the potential of using long-lived particle (LLP) searches for right-handed neutrinos (RHNs) to test resonant leptogenesis and the seesaw mechanism. This is challenging if only RHNs are added to the Standard Model, as naturally the active-sterile mixing strengths |VℓN|2 are small, for 1 GeV≲MN≲1000 GeV. Instead, we consider the minimal B−L gauge model, where a Z′ gauge boson couples to fermions including the RHNs. During leptogenesis, this gauge coupling introduces scattering processes that washout the B−L asymmetry. At colliders, it can lead to abundant production of RHNs which allows probing the associated seesaw mechanism using LLP searches. We find that LLP searches at the FCC-hh can test leptogenesis and the seesaw mechanism simultaneously and probe the active-sterile mixing at or below the seesaw floor. Published by the American Physical Society 2024
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