Search for two body muon decay signals

Bayes, R.; Bueno, J. F.; Davydov, Yu. I.; Depommier, P.; Faszer, W.; Fujiwara, Masahiro; Gagliardi, C. A.; Gaponenko, A.; Gill, D. R.; Grossheim, A.; Gumplinger, P.; Hasinoff, M.; Henderson, R.; Hillairet, A.; Hu, J.; Koetke, D. D.; MacDonald, R.; Marshall, G. M.; Mathie, E. L.; Mischke, R. E.; Olchanski, K.; Olin, A.; Openshaw, R.; Poutissou, J. M.; Poutissou, R.; Selivanov, V. I.; Sheffer, Gabriel; Shin, B. K.; Stanislaus, T. D. S.; Tacik, R.; Tribble, R. E.

doi:10.1103/physrevd.91.052020

Cited by 75 publications

(70 citation statements)

References 25 publications

(35 reference statements)

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“…For large values of c γγ (red line), we find that the dipole effects driven by the Barr-Zee contributions dominate for any values of m a , reproducing the results of Eq. (44). For c γγ = ±1/16π 2 , the above relation is broken by the anapole contributions for small values of m a .…”

Section: Numerical Results and Discussionmentioning

confidence: 90%

“…Finally, for c γγ = 0, anapole and dipole effects have a comparable size for any value of m a yielding a significant departure from Eq. (44). Before moving into the discussion of processes involving hadrons, we turn our attention to the anomalous magnetic moment of leptons (g − 2) which are tightly related to LFV processes, as we are going to see in the following.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

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Hunting for ALPs with lepton flavor violation

Cornella

Paradisi

Sumensari

2020

J. High Energ. Phys.

130

137

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We examine the low-energy signatures of axion-like particles (ALPs) in lepton flavor violating (LFV) processes. By using a dimension-5 effective Lagrangian, we compute the most general ALP contributions to LFV decays of leptons and mesons. The provided expressions are valid for any choice of ALP mass and couplings. We explore the complementarity of different processes, identifying specific patterns to be experimentally tested. Constraints on LFV couplings are derived from existing data and prospects for forthcoming experiments are also discussed. As a by-product, we revisit the possibility of a simultaneous explanation of the observed discrepancies in the muon and electron g − 2 through ALP interactions.

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Section: Numerical Results and Discussionmentioning

confidence: 90%

Section: Numerical Results and Discussionmentioning

confidence: 99%

Hunting for ALPs with lepton flavor violation

Cornella

Paradisi

Sumensari

2020

J. High Energ. Phys.

130

137

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“…Currently, the most stringent limit on this decay channel is BR(µ → eX)/BR(µ → eνν) < 2.6×10 −6 for a massless Z [90]; a similarly strong limit is obtained for m Z 16 MeV [90]. The TWIST collaboration also gives an upper limit, BR(µ → eX) 10 −5 for m Z = 13-80 MeV [91]. For heavier Z , the limit gets weaker to be 10 −4 [92].…”

Section: Lepton Flavor Violating Decay Of Charged Leptonsmentioning

confidence: 99%

Minimal gauged U(1)Lα−Lβ models driven into a corner

et al. 2019

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It is well known that the differences between the lepton numbers can be gauged with the Standard Model matter content. Such extended gauge theories, dubbed as the gauged U(1) Lα−L β models, have been widely discussed so far as potential candidates for physics beyond the Standard Model. In this work, we study the minimal versions of these gauge theories, where three right-handed neutrinos as well as a single U(1) Lα−L β symmetry breaking Higgs field-an SU(2) L singlet or doublet-are introduced. In these minimal models, the neutrino mass terms are constrained by the gauge symmetry, which result in the two-zero texture or twozero minor structure of neutrino mass matrices. Such restrictive forms of neutrino mass matrices lead to non-trivial predictions for the neutrino oscillation parameters as well as the size of the mass eigenvalues. We find that due to this restriction the minimal gauged U(1) Lα−L β models are either incompatible with the observed values of the neutrino parameters or in strong tension with the Planck 2018 limit on the sum of the neutrino masses. Only the U(1) Lµ−Lτ model with an SU(2) L singlet U(1) Lµ−Lτ -breaking field barely evades the limit, which can be tested in the future neutrino experiments.

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“…which can be improved by Belle and Belle-II [68][69][70]. In the muon sector, the best constraints on a Majoron with anisotropic emission come from µ → eJ [71] (to be improved with Mu3e [72]) and µ → eJγ [73]. The latter is also sensitive to m J = 0 and provides a limit…”

Section: A Light Majoronsmentioning

confidence: 99%

Majoron at two loops

Heeck

Patel

2019

Phys. Rev. D

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We present singlet-Majoron couplings to Standard Model particles through two loops at leading order in the seesaw expansion, including couplings to gauge bosons as well as flavor-changing quark interactions. We discuss and compare the relevant phenomenological constraints on Majoron production as well as decaying Majoron dark matter. A comparison with standard seesaw observables in low-scale settings highlights the importance of searches for lepton-flavor-violating two-body decays → +Majoron in both the muon and tau sectors.

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Search for two body muon decay signals

Cited by 75 publications

References 25 publications

Hunting for ALPs with lepton flavor violation

Hunting for ALPs with lepton flavor violation

Minimal gauged U(1)Lα−Lβ models driven into a corner

Majoron at two loops

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