Indirect constraints on lepton-flavor-violating quarkonium decays

Li, Tong; Marcano, Xabier; Schmidt, Michael A.

doi:10.1103/physrevd.106.115039

Cited by 10 publications

(1 citation statement)

References 99 publications

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“…The phenomenology of Majoron was discussed in many recent papers and so were, in particular, its leptonflavor-violating (LFV) interactions, which provides strong support in theory to the search for Majoron [17][18][19]. Recently, models predicting the flavor-violating muon decay have been revisited and have caused wide concern all over the world, where X is an invisible boson with a mass smaller than the muon mass [20][21][22][23]. There are some candidates for the new particle X, such as light gauge bosons [24] and light (pseudo-)scalars [20] including the familon [25], Majoron or axion-like particle (ALP) [26].…”

Section: Introductionmentioning

confidence: 99%

Search for Majoron at the COMET experiment*

Xing

Wu²,

Miao³

et al. 2023

Chinese Phys. C

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A new Goldstone particle named Majoron is introduced in order to explain the origin of neutrino mass by some new physics models assuming that neutrinos are Majorana particle. By expanding signal region and using likelihood analysis, it becomes possible to search for Majoron at experiments that is originally designed to search for μ-e conversion. For the COMET experiment, the sensitivity of process μ→eJ is able to reach Β μ→eJ=2.3∗10-5 in Phase-I and O(10-8) in Phase-II. Meanwhile, the sensitivities to search for Majoron at future experiments are also discussed in this article. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Section: Introductionmentioning

confidence: 99%

Search for Majoron at the COMET experiment*

Xing

Wu²,

Miao³

et al. 2023

Chinese Phys. C

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Decay constants of $$ c\overline{b} $$ mesons involving the ten heavy flavor-changing currents at N3LO QCD

Tao,

Xiao

2024

J. High Energ. Phys.

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Within the nonrelativistic QCD (NRQCD) framework, we complete the three-loop calculations of the NRQCD renormalization constants and the matching coefficients, for the heavy flavor-changing temporal vector, spatial-spatial tensor, spatial-temporal axial-tensor currents, which are coupled to the P-wave $$ c\overline{b} $$ c b ¯ mesons. We further study the ten decay constants for the $$ c\overline{b} $$ c b ¯ mesons (Bc, $$ {B}_c^{\ast } $$ B c ∗ , $$ {B}_{c0}^{\ast } $$ B c 0 ∗ , Bc1) coupled with the ten heavy flavor-changing currents involving (pseudo-)scalar, (axial-)vector and (axial-)tensor up to the next-to-next-to-next-to-leading order (N3LO) of αs. We obtain the six ratios of decay constants by approximating them to the corresponding ratios of matching coefficients. We find the N3LO perturbative QCD results for the six ratios of decay constants have good convergence and weak scale-dependence. We finally predict the hierarchical relationship among the ten decay constants for the $$ c\overline{b} $$ c b ¯ mesons coupled with the ten currents.

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Probing lepton flavor violation at Circular Electron-Positron Colliders

Altmannshofer,

Munbodh,

2023

J. High Energ. Phys.

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Lepton flavor violation is one of the cleanest probes of physics beyond the standard model. In this work, we explore the sensitivity of the process e+e− → τμ to new physics above the TeV scale at the proposed circular electron-positron colliders FCC-ee and CEPC. We compute the e+e− → τμ cross-section in the Standard Model Effective Field Theory and assess the relevant backgrounds. We compare our sensitivity projections to existing and expected constraints from tau decays and Z decays and find that the future electron-positron colliders provide competitive probes of new physics. We highlight the complementarity of searches for resonant e+e−→ Z → τμ production on the Z pole and searches for non-resonant e+e−→ τμ at higher center-of-mass energies.

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Indirect constraints on lepton-flavor-violating quarkonium decays

Cited by 10 publications

References 99 publications

Search for Majoron at the COMET experiment*

Search for Majoron at the COMET experiment*

Decay constants of $$ c\overline{b} $$ mesons involving the ten heavy flavor-changing currents at N3LO QCD

Probing lepton flavor violation at Circular Electron-Positron Colliders

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