Five-body leptonic decays of muon and tau leptons

Flores-Tlalpa, A.; Castro, G. López; Roig, Pablo

doi:10.1007/jhep04(2016)185

Cited by 28 publications

(25 citation statements)

References 52 publications

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“…Processes with charged lepton flavour violation (CLFV) can occur, therefore, through neutrino mixing in the loops; however, their rates are extremely small because of the suppression given by neutrino masses. For example the µ → eγ branching ratio, which is proportional to (m ν /M W ) 4 , is estimated to be at the level of 10 −50 or smaller, far beyond the sensitivity of any foreseeable experiment. For this reason, an experimental observation of CLFV would be a bright evidence of new physics (NP) beyond the SM.…”

Section: Introductionmentioning

confidence: 93%

“…Muon and tau decays with CLFV have been studied in a model independent way in the framework of higher dimensional operators [1][2][3] and in a general effective field theory description of the weak interactions at low energies [4]. Many scenarios of NP introduce additional sources of mixing between the lepton families that can easily lead to strong CLFV contributions.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 93%

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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“…al. [3]. However [1] and [3] differ from the predictions of [2] whose various branching ratios are ∼ 7% higher.…”

Section: Introductionmentioning

confidence: 57%

“…[3]. However [1] and [3] differ from the predictions of [2] whose various branching ratios are ∼ 7% higher. The CLEO II experiment has searched for the τ − → e − e + e −ν e ν τ decay, whose measured value is [4]: …”

Section: Introductionmentioning

confidence: 57%

τ−→ ℓi−ℓi+ℓj−ν̄jντ decays with a magnetic dipole term

Arroyo-Ureña

Diaz

Meza-Aldama

et al. 2017

Int. J. Mod. Phys. A

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Using the massive helicity formalism, we calculate the five-body average square amplitude of the decays [Formula: see text] [Formula: see text] within the Standard Model (SM), we then introduce a dimension-five effective vertex [Formula: see text] in order to determine the feasibility of imposing limits on the tau anomalous magnetic dipole moment [Formula: see text] via the current or future experimental measurements of the branching ratio for the decay [Formula: see text].

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“…can reach a level of 10 −9 , which is the detecting sensitivity at the Belle II [38]. In the Bell II experiment, τ leptons are produced in pairs and the signals of the τ decays could be…”

Section: B Z ′ and Rare τ Decaysmentioning

confidence: 98%

Lμ−Lτ gauge-boson production from lepton flavor violating τ decays at Belle II

Chen

Nomura²

2017

Phys. Rev. D

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L µ − L τ gauge boson (Z ′ ) with a mass in the MeV to GeV region can resolve not only the muon g − 2 excess, but also the gap in the high-energy cosmic neutrino spectrum at IceCube. It was recently proposed that such a light gauge boson can be detected during the Belle II experiment with a luminosity of 50 ab −1 by the e + e − → γ + / E process through the kinetic mixing with the photon, where the missing energy / E is from the Z ′ →νν decays. We study the phenomenological implications when a pair of singlet vector-like leptons carrying different L µ − L τ charges are included, and a complex singlet scalar (φ S ) is introduced to accomplish the spontaneous U (1) Lµ−Lτ symmetry breaking. It is found that the extension leads to several phenomena of interest, including (i) branching ratio (BR) for h → µτ can be of the order of 10 −3 ; (ii) φ S -mediated muon g − 2 can be of the order of 10 × 10 −10 ; (iii) BR for τ → µφ * S → µZ ′ Z ′ can be 10 −8 , and (iv) kinetic mixing between the Z ′ boson and photon is sensitive to the relative heavy lepton masses. The predicted BRs for τ → (3µ + / E, 5µ) through the leptonic Z ′ decays can reach a level of 10 −9 , in which the results fall within the sensitivity of the Belle II in the search for the rare tau decays.

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Five-body leptonic decays of muon and tau leptons

Cited by 28 publications

References 52 publications

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

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

τ−→ ℓi−ℓi+ℓj−ν̄jντ decays with a magnetic dipole term

Lμ−Lτ gauge-boson production from lepton flavor violating τ decays at Belle II

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