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Search for a light Higgs boson in single-photon decays of $$Upsilon(1S)$$ using $$Upsilon(2S) to pi^+ pi^- Upsilon(1S)$$ tagging method

Jia, S.*; 谷田 聖   ; Belle Collaboration*; 他211名*

Jia, S.*; Tanida, Kiyoshi; Belle Collaboration*; 211 of others*

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 $$Upsilon(2S)to pi^+ pi^- Upsilon(1S)$$ transitions, using 158 million $$Upsilon(2S)$$ 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 $$Upsilon(1S)to gamma A^0$$ and $$A^0to tau^+tau^-$$ varying from $$3.8times10^{-6}$$ to $$1.5times10^{-4}$$. Our results represent an approximately twofold improvement on the current world best upper limits for the $$Upsilon(1S)to gamma A^0(to tau^+tau^-)$$ production. For $$A^0to mu^+mu^-$$, the upper limits on the product branching fractions for $$Upsilon(1S)to gamma A^0$$ and $$A^0to mu^+mu^-$$ are at the same level as the world average limits, and vary from $$3.1times10^{-7}$$ to $$1.6times10^{-5}$$. The upper limits at 90% C.L. on the Yukawa coupling $$f_{Upsilon(1S)}$$ and mixing angle $${rm sin}theta_{A^0}$$ are also given.

発表言語

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English

掲載資料名

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Physical Review Letters

巻

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128

号

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8

ページ数

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p.081804_1 - 081804_9

発行年月

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2022/02

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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no keyword

特許データ

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PDF

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論文URL

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https://doi.org/10.1103/PhysRevLett.128.081804

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

使用施設

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広報プレスリリース

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論文解説
(JAEA R&D Navigator)

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受委託・共同研究相手機関

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Access

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- Accesses

InCites™

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パーセンタイル：39.48

分野：Physics, Multidisciplinary

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