Search for lepton-flavor-violating τ− → μ−μ+μ− decays at Belle II

Files

hdl_144003.pdf (675.07 KB)
  (Published version)

Date

2024

Authors

Adachi, I.
Aggarwal, L.
Aihara, H.
Akopov, N.
Aloisio, A.
Althubiti, N.
Anh Ky, N.
Asner, D.M.
Atmacan, H.
Aushev, V.

Editors

Advisors

Journal Title

Journal ISSN

Volume Title

Type:

Journal article

Citation

The Journal of High Energy Physics, 2024; 2024(9):62-1-62-22

Statement of Responsibility

The Belle II collaboration

Conference Name

DOI

10.1007/jhep09(2024)062

Abstract

We present the result of a search for the charged-lepton-flavor violating decay τ− → μ−μ+μ− using a 424 fb−1 sample of data recorded by the Belle II experiment at the SuperKEKB e+e− collider. The selection of e+e− → τ+τ− events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a 90% confidence level upper limit of 1.9 × 10−8 on the branching fraction of the τ− → μ−μ+μ− decay, which is the most stringent bound to date.

School/Discipline

Dissertation Note

Provenance

Description

Access Status

Rights

© The Authors. Article funded by SCOAP3. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

License

Grant ID

http://purl.org/au-research/grants/arc/DP200101792
 http://purl.org/au-research/grants/arc/DP210101900
 http://purl.org/au-research/grants/arc/DP210102831
 http://purl.org/au-research/grants/arc/DE220100462
 http://purl.org/au-research/grants/arc/LE210100098
 http://purl.org/au-research/grants/arc/LE230100085

Published Version

http://dx.doi.org/10.1007/jhep09(2024)062

Call number

Persistent link to this record

https://hdl.handle.net/2440/144003