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 þ e − → γa, a → γγ in the mass range 0.2 < m a < 9.7 GeV=c 2 using data corresponding to an integrated luminosity of ð445 3Þ 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 g aγγ of ALPs to photons at the level of 10 −3 GeV −1 . The limits are the most restrictive to date for 0.2 < m a < 1 GeV=c 2 .

Abudinén, F., Adachi, I., Aihara, H., Akopov, N., Aloisio, A., Ameli, F., et al. (2020). Search for Axionlike Particles Produced in e+e− Collisions at Belle II. PHYSICAL REVIEW LETTERS, 125(16), 161806 [10.1103/PhysRevLett.125.161806].

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

Bernieri, E.
Membro del Collaboration Group
;
Bussino, S.
Membro del Collaboration Group
;
De Pietro, G.
Membro del Collaboration Group
;
Martini, A.
Membro del Collaboration Group
;
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 þ e − → γa, a → γγ in the mass range 0.2 < m a < 9.7 GeV=c 2 using data corresponding to an integrated luminosity of ð445 3Þ 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 g aγγ of ALPs to photons at the level of 10 −3 GeV −1 . The limits are the most restrictive to date for 0.2 < m a < 1 GeV=c 2 .
Abudinén, F., Adachi, I., Aihara, H., Akopov, N., Aloisio, A., Ameli, F., et al. (2020). Search for Axionlike Particles Produced in e+e− Collisions at Belle II. PHYSICAL REVIEW LETTERS, 125(16), 161806 [10.1103/PhysRevLett.125.161806].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/371761
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