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<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<1 GeV/c2.

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

Bianchi F.;Destefanis M.;Marcello S.;Mussa R.;Spataro S.;Tamponi U.;Watanabe M.;
2020-01-01

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+e-→γa, a→γγ in the mass range 0.2<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<1 GeV/c2.
2020
125
16
161806-1
161806-9
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.161806
Abudinen F.; Adachi I.; Aihara H.; Akopov N.; Aloisio A.; Ameli F.; Anh Ky N.; Asner D.M.; Aushev T.; Aushev V.; Babu V.; Baehr S.; Bahinipati S.; Bam...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1804844
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