TY  - JOUR
AU  - Belle II Collaboration (Abudinen, F. et al
AU  - Gomis, P.
AU  - Marinas, C.
PY  - 2020
DA  - 2020//
TI  - Search for Axionlike Particles Produced in e(+)e(-) Collisions at Belle II
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 161806
EP  - 9pp
VL  - 125
IS  - 16
PB  - Amer Physical Soc
AB  - 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(-) -> gamma a, a -> gamma gamma in the mass range 0.2 < m(a) < 9.7 GeV/c(2) 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 g(a gamma gamma) 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).
SN  - 0031-9007
UR  - https://arxiv.org/abs/2007.13071
UR  - https://doi.org/10.1103/PhysRevLett.125.161806
DO  - 10.1103/PhysRevLett.125.161806
LA  - English
N1  - WOS:000577074900004
ID  - BelleIICollaborationAbudinen_etal2020
ER  -