• Open Access

Search for Axionlike Particles Produced in e+e Collisions at Belle II

F. Abudinén et al. (Belle II Collaboration)
Phys. Rev. Lett. 125, 161806 – Published 14 October 2020
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Abstract

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+eγa, aγγ in the mass range 0.2<ma<9.7GeV/c2 using data corresponding to an integrated luminosity of (445±3)pb1. 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 103GeV1. The limits are the most restrictive to date for 0.2<ma<1GeV/c2.

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  • Received 26 July 2020
  • Accepted 8 September 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.161806

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

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Particles & Fields

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Vol. 125, Iss. 16 — 16 October 2020

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