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Abudinén, F.; Adachi, I.; Akopov, N.; Anh Ky, N.; Bessner, M.; Bettarini, S.; Bianchi, F.; Bilokin, S.; Bračko, M.; Bussino, S.; Chilikin, K.; De Nuccio, M.; De Pietro, G.; de Sangro, R.; De Yta-Hernandez, A.; Dujany, G.; Forti, F.; Geßler, T.; Giri, A.; Greenwald, D.; Halder, S.; Hill, E. C.; Hu, Y.; Inguglia, G.; Jia, S.; Joo, C.; Kato, Y.; Kim, S.-H.; Kim, Y.-K.; Kleinwort, C.; Komarov, I.; Kurz, S.; Lacaprara, S.; Lanceri, L.; Leitl, P.; Li, L. K.; Libby, J.; Liu, Q. Y.; Liventsev, D.; Longo, S.; MacQueen, C.; Maeda, Y.; Matsuoka, K.; Müller, F. J.; Mussa, R.; Nakamura, I.; Nisar, N. K.; Ogawa, K.; Ogawa, S.; Ono, H.; Ozaki, H.; Panta, A.; Park, S.-H.; Pathak, A.; Pedlar, T. K.; Peschke, R.; Polat, G.; Prim, M. T.; Rad, N.; Rasheed, R.; Reiter, S.; Remnev, M.; Ritzert, M.; Rostomyan, A.; Sanders, D. A.; Sangal, A.; Santelj, L.; Sato, Y.; Savinov, V.; Schwartz, A. J.; Seino, Y.; Sfienti, C.; Shiu, J.-G.; Simon, F.; Soffer, A.; Spataro, S.; Stefkova, S.; Sumiyoshi, T.; Summers, D. J.; Takizawa, M.; Tamponi, U.; Tanaka, S.; Tanida, K.; Taras, P.; Tenchini, F.; Tonelli, D.; Trabelsi, K.; Uglov, T.; Unger, K.; Ushiroda, Y.; Vahsen, S. E.; van Tonder, R.; Varner, G. S.; Vitale, L.; Waheed, E.; Yan, W.; Yonenaga, M.; Yusa, Y.; Zani, L.; Zhou, Q. D.
Physical review letters, 10/2020, Letnik: 125, Številka: 16Journal Article
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<ma<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<ma<1 GeV/c2.
