Lepton flavour violation and flavour symmetries

Deppisch, Frank F.

doi:10.1002/prop.201200126

Cited by 25 publications

(29 citation statements)

References 171 publications

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“…Therefore, instead of reviewing the muon anomalous magnetic moment individually, it is perhaps more important to review its connection to the quest for LFV, such as the decay µ → eγ [169][170][171][172][173][174][175][176][177][178][179][180]. In the SM, lepton flavor is a conserved quantity since neutrinos are massless.…”

Section: Determination Boundmentioning

confidence: 99%

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A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

2018

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We review how the muon anomalous magnetic moment (g − 2) and the quest for lepton flavor violation are intimately correlated. Indeed the decay µ → eγ is induced by the same amplitude for different choices of in-and outgoing leptons. In this work, we try to address some intriguing questions such as:Which hierarchy in the charged lepton sector one should have in order to reconcile possible signals coming simultaneously from g − 2 and lepton flavor violation?What can we learn if the g − 2 anomaly is confirmed by the upcoming flagship experiments at FERMILAB and J-PARC, and no signal is seen in the decay µ → eγ in the foreseeable future? On the other hand, if the µ → eγ decay is seen in the upcoming years, do we need to necessarily observe a signal also in g − 2?.In this attempt, we generally study the correlation between these observables in a detailed analysis of simplified models. We derive master integrals and

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Section: Determination Boundmentioning

confidence: 99%

“…(179), in the regime of heavy RH neutrinos. The explicit form of the PMNS matrix can also be found in the PDG review of particle physics [15].…”

Section: Type II Seesawmentioning

confidence: 99%

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

2018

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“…Although our study is motivated from a phenomenological point of view, it is worth mentioning that the texture zeros in fermion mass matrices can have dynamical origin from flavour symmetries. See, for example, the scenarios proposed in [64][65][66][67][68][69][70][71][72][73][74] where discrete as well as continuous symmetries were considered to explain the texture zeros. In particular, the recent work [66] considered a different version of LRSM where charged fermions receive masses from a universal seesaw mechanism while neutrinos acquire masses at the radiative level.…”

Section: Texture Zeros In Lepton Mass Matrices Of Lrsmmentioning

confidence: 99%

Phenomenological study of texture zeros in lepton mass matrices of minimal left-right symmetric model

Borgohain

Das

Borah

2019

J. High Energ. Phys.

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We consider the possibility of texture zeros in lepton mass matrices of the minimal left-right symmetric model (LRSM) where light neutrino mass arises from a combination of type I and type II seesaw mechanisms. Based on the allowed texture zeros in light neutrino mass matrix from neutrino and cosmology data, we make a list of all possible allowed and disallowed texture zeros in Dirac and heavy neutrino mass matrices which appear in type I and type II seesaw terms of LRSM. For the numerical analysis we consider those cases with maximum possible texture zeros in light neutrino mass matrix M ν , Dirac neutrino mass matrix M D , heavy neutrino mass matrix M RR while keeping the determinant of M RR non-vanishing, in order to use the standard type I seesaw formula. The possibility of maximum zeros reduces the free parameters of the model making it more predictive. We then compute the new physics contributions to rare decay processes like neutrinoless double beta decay, charged lepton flavour violation. We find that even for a conservative lower limit on left-right symmetry scale corresponding to heavy charged gauge boson mass 4.5 TeV, in agreement with collider bounds, for right-handed neutrino masses above 1 GeV, the new physics contributions to these rare decay processes can saturate the corresponding experimental bound. * happy@tezu.ernet.in † mkdas@tezu.ernet.in ‡ dborah@iitg.ac.in

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“…Because of their sensitivity, we here focus on low energy LFV processes µ → eγ, µ → eee and µ → e conversion in nuclei, and for example do not consider LFV τ decays. For a review of LFV and new physics scenarios, see for example [52]. In the LRSM, the processes are described by the diagrams shown in Figures 6 and 7, respectively.…”

Section: Low Energy Lepton Flavour Violating Processesmentioning

confidence: 99%

Double beta decay, lepton flavor violation, and collider signatures of left-right symmetric models with spontaneousD-parity breaking

et al. 2015

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We propose a class of left-right symmetric models (LRSMs) with spontaneous D parity breaking, where SU (2)R breaks at the TeV scale while discrete left-right symmetry breaks around 10 9 GeV. By embedding this framework in a non-supersymmetric SO(10) Grand Unified Theory (GUT) with Pati-Salam symmetry as the highest intermediate breaking step, we obtain gR/gL ≈ 0.6 between the right-and left-handed gauge couplings at the TeV scale. This leads to a suppression of beyond the Standard Model phenomena induced by the right-handed gauge coupling. Here we focus specifically on the consequences for neutrinoless double beta decay, low energy lepton flavour violation and LHC signatures due to the suppressed right handed currents. Interestingly, the reduced gR allows us to interpret an excess of events observed recently in the range of 1.9 TeV to 2.4 TeV by the CMS group at the LHC as the signature of a right handed gauge boson in LRSMs with spontaneous D parity breaking. Moreover, the reduced right-handed gauge coupling also strongly suppresses the non-standard contribution of heavy states to the neutrinoless double beta decay rate as well as the amplitude of low energy lepton flavour violating processes. In a dominant type-II Seesaw mechanism of neutrino mass generation, we find that both sets of observables provide stringent and complimentary bounds which make it challenging to observe the scenario at the LHC.

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Lepton flavour violation and flavour symmetries

Cited by 25 publications

References 171 publications

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

Phenomenological study of texture zeros in lepton mass matrices of minimal left-right symmetric model

Double beta decay, lepton flavor violation, and collider signatures of left-right symmetric models with spontaneousD-parity breaking

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