Search for Axionlike Particles Produced in e^ + e^ - Collisions at Belle II.
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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^{+}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 (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_{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}. |
| Year of Publication | :
2020
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| Journal | :
Physical review letters
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| Volume | :
125
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| Issue | :
16
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| Number of Pages | :
161806
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| Date Published | :
2020
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| ISSN Number | :
0031-9007
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| URL | :
https://link.aps.org/abstract/PRL/v125/p161806
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| DOI | :
10.1103/PhysRevLett.125.161806
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| Short Title | :
Phys Rev Lett
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