Probing charged lepton flavor violation with axion-like particles at Belle II

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 τ → Xl with l = e, μ, followed by its decay via X → l − l +. The ALP can be either promptly de...

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Autores principales:	Kingman Cheung, Abner Soffer, Zeren Simon Wang, Yu-Heng Wu
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Beyond Standard Model Effective Field Theories Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/5b4660e4f6054cd1b2bd7942ea36e674
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spelling	oai:doaj.org-article:5b4660e4f6054cd1b2bd7942ea36e6742021-12-05T12:25:14ZProbing charged lepton flavor violation with axion-like particles at Belle II10.1007/JHEP11(2021)2181029-8479https://doaj.org/article/5b4660e4f6054cd1b2bd7942ea36e6742021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)218https://doaj.org/toc/1029-8479Abstract 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 τ → Xl with l = e, μ, followed by its decay via X → 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 τ 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.Kingman CheungAbner SofferZeren Simon WangYu-Heng WuSpringerOpenarticleBeyond Standard ModelEffective Field TheoriesNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-28 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Beyond Standard Model Effective Field Theories Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Beyond Standard Model Effective Field Theories Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Kingman Cheung Abner Soffer Zeren Simon Wang Yu-Heng Wu Probing charged lepton flavor violation with axion-like particles at Belle II
description	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 τ → Xl with l = e, μ, followed by its decay via X → 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 τ 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.
format	article
author	Kingman Cheung Abner Soffer Zeren Simon Wang Yu-Heng Wu
author_facet	Kingman Cheung Abner Soffer Zeren Simon Wang Yu-Heng Wu
author_sort	Kingman Cheung
title	Probing charged lepton flavor violation with axion-like particles at Belle II
title_short	Probing charged lepton flavor violation with axion-like particles at Belle II
title_full	Probing charged lepton flavor violation with axion-like particles at Belle II
title_fullStr	Probing charged lepton flavor violation with axion-like particles at Belle II
title_full_unstemmed	Probing charged lepton flavor violation with axion-like particles at Belle II
title_sort	probing charged lepton flavor violation with axion-like particles at belle ii
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/5b4660e4f6054cd1b2bd7942ea36e674
work_keys_str_mv	AT kingmancheung probingchargedleptonflavorviolationwithaxionlikeparticlesatbelleii AT abnersoffer probingchargedleptonflavorviolationwithaxionlikeparticlesatbelleii AT zerensimonwang probingchargedleptonflavorviolationwithaxionlikeparticlesatbelleii AT yuhengwu probingchargedleptonflavorviolationwithaxionlikeparticlesatbelleii
_version_	1718371958138077184

Probing charged lepton flavor violation with axion-like particles at Belle II

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