A robust search for lepton flavour violating axions at Mu3e

被引：0

作者：

Knapen, Simon ^{[1
,2
]}

Langhoff, Kevin ^{[1
,2
]}

Opferkuch, Toby ^{[1
,2
,3
]}

Redigolo, Diego ^{[4
]}

机构：

[1] Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Theory Grp, Berkeley, CA 94720 USA

[3] SISSA Int Sch Adv Studies, Via Bonomea 265, I-34136 Trieste, Italy

[4] INFN, Sez Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2025年 / 07期

基金：

美国国家科学基金会;

关键词：

Axions and ALPs; Baryon/Lepton Number Violation; New Light Particles; Theories of Flavour;

D O I：

10.1007/JHEP07(2025)243

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We propose a search at Mu3e for lepton flavor violating axion(-like) particles in mu -> 3e + a decays. By requiring an additional e+e- pair from internal conversion, one can circumvent the calibration challenges which plague the mu -> e + a channel for axions lighter than 20 MeV. Crucially, the corresponding reduction in signal rate is to a large extent compensated for by Mu3e's ability to resolve highly collimated tracks. For phase I of Mu3e, we project a sensitivity to decay constants as high as 6 x 109 GeV which probes uncharted parameter space in scenarios of axion dark matter. The sensitivity to axions which couple primarily to right-handed leptons can be further improved by leveraging the polarisation of the muon beam.

引用

页数：12

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