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Title: Search for a Light Higgs Boson in Single-Photon Decays of ϒ ( 1 S ) Using ϒ ( 2 S ) π + π ϒ ( 1 S ) Tagging Method

Journal Article · · Physical Review Letters
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We search for a light Higgs boson (A0) decaying into a τ+τ- or µ+µ- pair in the radiative decays of Υ(1S). The production of Υ(1S) mesons is tagged by Υ(2S) → π+π-Υ(1S) transitions, using 158 million x 106 Υ(2S) events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant A0 signals in the mass range from the τ+τ- or µ+µ- threshold to 9.2 GeV/c2 are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for Υ(1S) → γA0 and A0 → τ+τ- varying from 3.8 x 10-6 to 1.5 x 10-4. Our results represent an approximately twofold improvement on the current world best upper limits for the Υ(1S) → γA0(→ τ+τ-) production. For A0 → µ+µ-, the upper limits on the product branching fractions for Υ(1S) → γA0 and A0 → µ+µ- are at the same level as the world average limits, and vary from 3.1x10-7 to 1.6x10-5. The upper limits at 90% C.L. on the Yukawa coupling fΥ(1S) and mixing angle sinθA0 are also given.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Contributing Organization:
Belle Collaboration
Grant/Contract Number:
SC0012704
OSTI ID:
1846222
Alternate ID(s):
OSTI ID: 1862331
Report Number(s):
BNL-222912-2022-JAAM; PRLTAO; 081804
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 128 Journal Issue: 8; ISSN 0031-9007
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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