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Probing charged lepton flavor violation with axion-like particles at Belle II
- Source :
- Journal of High Energy Physics, Journal of High Energy Physics, Vol 2021, Iss 11, Pp 1-28 (2021)
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- We study charged lepton flavor violation associated with a light leptophilic axion-like particle (ALP), $X$, at the $B$-factory experiment Belle II. We focus on production of the ALP in the tau decays $\tau \to X l$ with $l=e,\mu$, followed by its decay via $X\to l^- l^+$. The ALP can be either promptly decaying or long-lived. We perform Monte-Carlo simulations, recasting a prompt search at Belle for lepton-flavor-violating $\tau$ decays, and propose a displaced-vertex (DV) search. For both types of searches, we derive the Belle~II sensitivity reaches in both the product of branching fractions and the ALP coupling constants, as functions of the ALP mass and lifetime. The results show that the DV search exceeds the sensitivity reach of the prompt search to the relevant branching fractions by up to about a factor of 40 in the long decay length regime.<br />Comment: v1, 27 pages, 9 figures, 3 tables; v2, minor changes, mainly updated beam-dump and lepton-flavor-universality constraints, accepted for publication in JHEP
- Subjects :
- Physics
Coupling constant
Nuclear and High Energy Physics
Particle physics
High Energy Physics::Phenomenology
FOS: Physical sciences
Effective Field Theories
QC770-798
High Energy Physics - Experiment
Physics::Geophysics
High Energy Physics - Phenomenology
High Energy Physics - Experiment (hep-ex)
High Energy Physics - Phenomenology (hep-ph)
Nuclear and particle physics. Atomic energy. Radioactivity
Product (mathematics)
Beyond Standard Model
Decay length
High Energy Physics::Experiment
Production (computer science)
Axion
Flavor
Lepton
Subjects
Details
- ISSN :
- 10298479
- Volume :
- 2021
- Database :
- OpenAIRE
- Journal :
- Journal of High Energy Physics
- Accession number :
- edsair.doi.dedup.....6b01ff63eb94f91d92547c2009a59434