Search for a Light Higgs Boson in Single-Photon Decays of Upsilon(1S) Using (SIC)(2S) -> pi(+) pi(-) Upsilon(1S) Tagging Method

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10454435" target="_blank" >RIV/00216208:11320/22:10454435 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-ayw..5DzR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-ayw..5DzR</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.128.081804" target="_blank" >10.1103/PhysRevLett.128.081804</a>

Result language
angličtina
Original language name
Search for a Light Higgs Boson in Single-Photon Decays of Upsilon(1S) Using (SIC)(2S) -> pi(+) pi(-) Upsilon(1S) Tagging Method
Original language description
We search for a light Higgs boson (A(0)) decaying into a tau(+)tau(-) or mu(+)mu(-) pair in the radiative decays of Upsilon(1S). The production of Upsilon(1S) mesons is tagged by Upsilon(2S) -> pi(+)pi(-)Upsilon(1S) transitions, using 158 x 10(6) Upsilon(2S) events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant A(0) signals in the mass range from the tau(+)tau(-) or mu(+)mu(-) threshold to 9.2 GeV/c(2) are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for Upsilon(1S) -> gamma A(0) and A(0) -> tau(+)tau(-) 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 Upsilon(1S) -> gamma A(0) (tau(+)tau(-)) production. For A(0) -> mu(+) mu(-), the upper limits on the product branching fractions for Upsilon(1S) -> gamma A(0) and A(0) -> mu(+)mu(-) are at the same level as the world average limits, and vary from 3.1 x 10(-7) to 1.6 x 10(-5). The upper limits at 90% credibility level on the Yukawa coupling f((SIC)(1S)) and mixing angle sin theta(A0) are also given.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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