2020年10月14日
Search for Axionlike Particles Produced in e⁺e⁻ Collisions at Belle II
Physical Review Letters
- 巻
- 125
- 号
- 16
- 開始ページ
- 161806
- 終了ページ
- 161806
- 記述言語
- 英語
- 掲載種別
- 出版者・発行元
- American Physical Society.
We present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e⁺e⁻ → γa, a → γγ in the mass range 0.2 < ma < 9.7 GeV/c² using data corresponding to an integrated luminosity of (445±3) pb⁻¹. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength gaγγ of ALPs to photons at the level of 10⁻³ GeV⁻¹. The limits are the most restrictive to date for 0.2 < ma < 1 GeV/c².
- リンク情報
- ID情報
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- ISSN : 0031-9007
- CiNii Articles ID : 120006950612