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Search for axionlike particles produced in $$e^+e^-$$ collisions at Belle II

Abudin$'e$n, F.*; Tanida, Kiyoshi   ; Belle II Collaboration*; 334 of others*

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 $${e^+e^-togamma a, a togammagamma}$$ in the mass range $${0.2} , < m_a < {9.7},$$${GeV/$c^2$}$ using data corresponding to an integrated luminosity of $$(445pm 3),$$pb$$^{-1}$$. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axion-like 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 $$g_{agammagamma}$$ 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/$$c^2$$.

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Category:Physics, Multidisciplinary

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