학술논문

Search for the decay $B^{0}\to\gamma\gamma$ using Belle and Belle II data
Document Type
Working Paper
Author
BelleCollaborations, Belle IIAdachi, I.Aggarwal, L.Aihara, H.Akopov, N.Aloisio, A.Said, S. AlAlthubiti, N.Ky, N. AnhAsner, D. M.Atmacan, H.Aushev, T.Aushev, V.Aversano, M.Ayad, R.Babu, V.Bae, H.Bahinipati, S.Bambade, P.Banerjee, Sw.Bansal, S.Barrett, M.Baudot, J.Baur, A.Beaubien, A.Becherer, F.Becker, J.Belous, K.Bennett, J. V.Bernlochner, F. U.Bertacchi, V.Bertholet, E.Bessner, M.Bettarini, S.Bhuyan, B.Bianchi, F.Bierwirth, L.Bilka, T.Biswas, D.Bobrov, A.Bodrov, D.Bolz, A.Borah, J.Boschetti, A.Bozek, A.Bračko, M.Branchini, P.Briere, R. A.Browder, T. E.Budano, A.Bussino, S.Campagna, Q.Campajola, M.Cao, L.Casarosa, G.Cecchi, C.Cerasxoli, J.Chang, M. -C.Chang, P.Cheema, P.Chen, C.Cheon, B. G.Chilikin, K.Chirapatpimol, K.Cho, H. -E.Cho, K.Cho, S. -J.Choi, S. -K.Choudhury, S.Corona, L.Cui, J. X.Dattola, F.De La Cruz-Burelo, E.De La Motte, S. A.De Nardo, G.De Nuccio, M.De Pietro, G.de Sangro, R.Destefanis, M.Dey, S.Dhamija, R.Di Canto, A.Di Capua, F.Dingfelder, J.Doležal, Z.Jiménez, I. DomínguezDong, T. V.Dorigo, M.Dorner, D.Dort, K.Dossett, D.Dreyer, S.Dubey, S.Dugic, K.Dujany, G.Ecker, P.Eliachevitch, M.Epifanov, D.Feichtinger, P.Ferber, T.Fillinger, T.Finck, C.Finocchiaro, G.Fodor, A.Forti, F.Frey, A.Fulsom, B. G.Ganiev, E.Garcia-Hernandez, M.Gaudino, G.Gaur, V.Gaz, A.Gellrich, A.Ghevondyan, G.Ghosh, D.Ghumaryan, H.Giakoustidis, G.Giordano, R.Giri, A.Glazov, A.Gobbo, B.Godang, R.Gogota, O.Goldenzweig, P.Gradl, W.Graziani, E.Greenwald, D.Gruberová, Z.Gu, T.Gudkova, K.Haide, I.Han, Y.Hara, T.Harris, C.Hayasaka, K.Hayashii, H.Hazra, S.Hearty, C.Hedges, M. T.Heidelbach, A.de la Cruz, I. HerediaVillanueva, M. HernándezHiguchi, T.Hoek, M.Hohmann, M.Horak, P.Hsu, C. -L.Humair, T.Inami, K.Ipsita, N.Ishikawa, A.Itoh, R.Iwasaki, M.Jackson, P.Jacobs, W. W.Jaffe, D. E.Jang, E. -J.Jia, S.Jin, Y.Johnson, A.Joo, K. K.Junkerkalefeld, H.Kalita, D.Kaliyar, A. B.Kandra, J.Kang, K. H.Kang, S.Karyan, G.Kawasaki, T.Keil, F.Kiesling, C.Kim, C. -H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kindo, H.Kinoshita, K.Kodyš, P.Koga, T.Kohani, S.Kojima, K.Korobov, A.Korpar, S.Kovalenko, E.Kowalewski, R.Križan, P.Krokovny, P.Kuhr, T.Kulii, Y.Kumar, J.Kumar, R.Kumara, K.Kunigo, T.Kuzmin, A.Kwon, Y. -J.Lacaprara, S.Lalwani, K.Lam, T.Lange, J. S.Laurenza, M.Leboucher, R.Lee, M. J.Lemettais, C.Leo, P.Levit, D.Li, L. K.Li, S. X.Li, Y.Li, Y. B.Libby, J.Liptak, Z.Liu, M. H.Liu, Q. Y.Liu, Z. Q.Liventsev, D.Longo, S.Lueck, T.Lyu, C.Ma, Y.Maggiora, M.Maharana, S. P.Maiti, R.Maity, S.Mancinelli, G.Manfredi, R.Manoni, E.Mantovano, M.Marcantonio, D.Marcello, S.Marinas, C.Martellini, C.Martens, A.Martini, A.Martinov, T.Massaccesi, L.Masuda, M.Matsuoka, K.Matvienko, D.Maurya, S. K.McKenna, J. A.Meier, F.Merola, M.Metzner, F.Miller, C.Mirra, M.Mitra, S.Miyabayashi, K.Mohanty, G. B.Mondal, S.Moneta, S.Moser, H. -G.Mrvar, M.Nakamura, I.Nakao, M.Nakazawa, Y.Naruki, M.Narwal, D.Natkaniec, Z.Natochii, A.Nayak, M.Nazaryan, G.Neu, M.Niiyama, M.Nishida, S.Ogawa, S.Onishchuk, Y.Ono, H.Pakhlova, G.Pardi, S.Parham, K.Park, H.Park, J.Park, S. -H.Paschen, B.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Peschke, R.Pestotnik, R.Piccolo, M.Piilonen, L. E.Angioni, G. PinnaPodesta-Lerma, P. L. M.Podobnik, T.Pokharel, S.Praz, C.Prell, S.Prencipe, E.Prim, M. T.Prudiiev, I.Purwar, H.Rados, P.Raeuber, G.Raiz, S.Rauls, N.Reif, M.Reiter, S.Remnev, M.Reuter, L.Ripp-Baudot, I.Rizzo, G.Robertson, S. H.Roehrken, M.Roney, J. M.Rostomyan, A.Rout, N.Sandilya, S.Santelj, L.Sato, Y.Savinov, V.Scavino, B.Schneider, S.Schnell, G.Schnepf, M.Schoenning, K.Schwanda, C.Seino, Y.Selce, A.Senyo, K.Serrano, J.Sevior, M. E.Sfienti, C.Shan, W.Sharma, C.Shen, C. P.Shi, X. D.Shillington, T.Shimasaki, T.Shiu, J. -G.Shtol, D.Sibidanov, A.Simon, F.Singh, J. B.Skorupa, J.Sobie, R. J.Sobotzik, M.Soffer, A.Sokolov, A.Solovieva, E.Spataro, S.Spruck, B.Starič, M.Stavroulakis, P.Stefkova, S.Stroili, R.Sue, Y.Sumihama, M.Suwonjandee, N.Svidras, H.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Thaller, A.Tittel, O.Tiwary, R.Tonelli, D.Torassa, E.Trabelsi, K.Ueda, I.Uglov, T.Unger, K.Unno, Y.Uno, K.Uno, S.Ushiroda, Y.Vahsen, S. E.van Tonder, R.Varvell, K. E.Veronesi, M.Vinokurova, A.Vismaya, V. S.Vitale, L.Vobbilisetti, V.Volpe, R.Vossen, A.Wach, B.Wakai, M.Wallner, S.Wang, E.Wang, M. -Z.Wang, X. L.Wang, Z.Warburton, A.Watanuki, S.Wessel, C.Won, E.Xie, Y.Xu, X. P.Yabsley, B. D.Yamada, S.Yan, W.Yang, S. B.Yelton, J.Yin, J. H.Yook, Y. M.Yoshihara, K.Yuan, C. Z.Yusa, Y.Zani, L.Zeng, F.Zhang, B.Zhilich, V.Zhou, J. S.Zhou, Q. D.Zhukova, V. I.Žlebčík, R.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We report the result of a search for the rare decay $B^{0} \to \gamma \gamma$ using a combined dataset of $753\times10^{6}$ $B\bar{B}$ pairs collected by the Belle experiment and $387\times10^{6}$ $B\bar{B}$ pairs collected by the Belle II experiment from decays of the $\rm \Upsilon(4S)$ resonance produced in $e^{+}e^{-}$ collisions. A simultaneous fit to the Belle and Belle II data sets yields $11.0^{+6.5}_{-5.5}$ signal events, corresponding to a 2.5$\sigma$ significance. We determine the branching fraction $\mathcal{B}(B^{0} \to \gamma\gamma) = (3.7^{+2.2}_{-1.8}(\rm stat)\pm0.5(\rm syst))\times10^{-8}$ and set a 90% credibility level upper limit of $\mathcal{B}(B^{0} \to \gamma\gamma) < 6.4\times10^{-8}$.