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Title: Search for charged lepton flavor violating decays of $$\Upsilon (1S)$$

Journal Article · · Journal of High Energy Physics (Online)
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We present a search for the charged lepton-flavor-violating decays Υ(1S) → ℓ±ℓ'∓ and radiative charged lepton-flavour-violating decays Υ(1S) → γℓ±ℓ'∓ [ℓ,ℓ' = e, μ, τ] using the 158 million Υ(2S) sample collected by the Belle detector at the KEKB collider. This search uses Υ(1S) mesons produced in Υ(2S) → π+π– Υ(1S) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
BELLE Collaboration
Grant/Contract Number:
FG02-97ER41033; SC0012704
OSTI ID:
1871825
Report Number(s):
BNL-223050-2022-JAAM
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 5 Vol. 2022; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

References (15)

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The Belle detector
  • Abashian, A.; Gotow, K.; Morgan, N.
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journal February 2002
Electron identification in Belle
  • Hanagaki, K.; Kakuno, H.; Ikeda, H.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 485, Issue 3 https://doi.org/10.1016/S0168-9002(01)02113-1
journal June 2002
Muon identification in the Belle experiment at KEKB
  • Abashian, A.; Abe, K.; Abe, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 491, Issue 1-2 https://doi.org/10.1016/S0168-9002(02)01164-6
journal September 2002
Belle PID journal November 2002
Overview of the KEKB accelerators journal February 2003
PYTHIA 6.4 physics and manual journal May 2006
Theoretical aspects of charged Lepton Flavour Violation journal September 2017
Physics achievements from the Belle experiment journal January 2012
Lepton number as the fourth "color" journal July 1974
Lepton flavor violating quarkonium decays journal October 2016
Unity of All Elementary-Particle Forces journal February 1974
Flavor physics of leptons and dipole moments journal September 2008

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