Lepton flavour violation in the MSSM

Girrbach, Jennifer; Mertens, S.; Nierste, Ulrich; Wiesenfeldt, Sören

doi:10.1007/jhep05(2010)026

Cited by 50 publications

(57 citation statements)

References 70 publications

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“…While it is not possible to distinguish the LHT model from the supersymmetric models on the basis of µ → eγ alone, it has been pointed out in [353] that such a distinction can be made by measuring any of the ratios B(µ → 3e)/B(µ → eγ), B(τ → 3µ)/B(τ → µγ), etc. In supersymmetric models all these decays are governed by dipole operators so that these ratios are O(α) [349,[354][355][356][357][358][359]. In the LHT model the LFV decays with three leptons in the final state are not governed by dipole operators but by Z-penguins and box diagrams and the ratios in question turn out to be by almost an order of magnitude larger than in supersymmetric models.…”

Section: Charged Lepton Flavour Violationmentioning

confidence: 97%

Towards the identification of new physics through quark flavour violating processes

2014

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We outline a systematic strategy which should help in this decade to identify New Physics (NP) beyond the Standard Model (SM) by means of quark flavour violating processes and thereby to extend the picture of short distance physics down to the scales as short as 10 −20 m and even shorter distance scales corresponding to energies of 100 TeV. Rather than using all possible flavour violating observables that will be measured in the coming years at the LHC, SuperKEKB and in Kaon physics dedicated experiments at CERN, J-PARC and Fermilab, we concentrate on those observables that are theoretically clean and very sensitive to NP. Assuming that the data on the selected observables by us will be very precise, we stress the importance of correlations between these observables as well as of future precise calculations of non-perturbative parameters by means of lattice QCD simulations with dynamical fermions. Our strategy consists of twelve steps which we will discuss in detail illustrating possible outcomes with the help of the SM, models with constrained Minimal Flavour Violation (CMFV), MFV at large and models with tree-level FCNCs mediated by neutral gauge bosons and scalars. We also briefly summarize the status of a number of concrete models. We propose DNA-charts that exhibit correlations between flavour observables in different NP scenarios. The models with new left-handed and/or right-handed currents and non-MFV interactions can be distinguished transparently in this manner. We emphasize the important role of the stringent CMFV relations between various observables as standard candles of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario. The success of this program will be very much facilitated through direct signals of NP at the LHC even if LHC will not be able to probe the physics at scales shorter than 4×10 −20 m. We also emphasize the importance of lepton flavour violation, electric dipole moments and (g − 2) e,µ in these studies.

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Section: Charged Lepton Flavour Violationmentioning

confidence: 97%

Towards the identification of new physics through quark flavour violating processes

2014

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“…24) contributing to g − 2: (i) muon-neutralino-smuon; (ii) muon-chargino-sneutrino, which are found to be, respectively [266][267][268][269][270][271][272][273][274][275][276][277][278][279][280][281][282] …”

Section: Minimal Supersymmetric Standard Modelmentioning

confidence: 99%

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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“…Many scenarios of NP introduce additional sources of mixing between the lepton families that can easily lead to strong CLFV contributions. CFLV violation can be realized, for example, in minimal see-saw type extensions of the SM [5,6], in the MSSM via flavour non-diagonal SUSY breaking terms [7][8][9][10][11], or in the context of two-Higgs-doublet models [12][13][14][15] and composite Higgs models [16] with generic flavour structures in the lepton sector.…”

Section: Introductionmentioning

confidence: 99%

Next-to-leading order prediction for the decay μ → e e + e − ν ν ¯ $$ \mu \to e\kern0.22em \left({e}^{+}{e}^{-}\right)\;\nu \kern0.2em \overline{\nu} $$

Fael

Greub

2017

J. High Energ. Phys.

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We present the differential decay rates and the branching ratios of the muon decay with internal conversion, µ → e (e + e − ) νν, in the Standard Model at next-to-leading order (NLO) in the on-shell scheme. This rare decay mode of the muon is among the main sources of background to the search for µ → eee decay. We found that in the phase space region where the neutrino energies are small, and the three-electron momenta have a similar signature as in the µ → eee decay, the NLO corrections decrease the leading-order prediction by about 10 − 20% depending on the applied cut.

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Lepton flavour violation in the MSSM

Cited by 50 publications

References 70 publications

Towards the identification of new physics through quark flavour violating processes

Towards the identification of new physics through quark flavour violating processes

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

Next-to-leading order prediction for the decay μ → e e + e − ν ν ¯ $$ \mu \to e\kern0.22em \left({e}^{+}{e}^{-}\right)\;\nu \kern0.2em \overline{\nu} $$

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