Measurement of $B \to K{}^{*}(892)\gamma$ decays at Belle II
Creators: name: Adachi, I.
name: Aggarwal, L.
name: Ahmed, H.
name: Aihara, H.
name: Akopov, N.
name: Aloisio, A.
name: Althubiti, N.
name: Anh Ky, N.
name: Asner, D. M.
name: Atmacan, H.
name: Aushev, T.
name: Aushev, V.
name: Aversano, M.
name: Ayad, R.
name: Babu, V.
name: Bae, H.
name: Baghel, N. K.
name: Bahinipati, S.
name: Bambade, P.
name: Banerjee, Sw.
name: Bansal, S.
name: Barrett, M.
name: Bartl, M.
name: Baudot, J.
name: Baur, A.
name: Beaubien, A.
name: Becherer, F.
name: Becker, J.
name: Bennett, J. V.
name: Bernlochner, F. U.
name: Bertacchi, V.
name: Bertemes, M.
name: Bertholet, E.
name: Bessner, M.
name: Bettarini, S.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Bianchi, F.
name: Bierwirth, L.
name: Bilka, T.
name: Biswas, D.
name: Bobrov, A.
name: Bodrov, D.
name: Bolz, A.
name: Bondar, A.
name: Borah, J.
name: Boschetti, A.
name: Bozek, A.
name: Bračko, M.
name: Branchini, P.
name: Briere, R. A.
name: Browder, T. E.
name: Budano, A.
name: Bussino, S.
name: Campagna, Q.
name: Campajola, M.
name: Cao, L.
name: Casarosa, G.
name: Cecchi, C.
name: Cerasoli, J.
name: Chang, M.-C.
name: Chang, P.
name: Cheaib, R.
name: Cheema, P.
name: Chen, C.
name: Cheon, B. G.
name: Chilikin, K.
name: Chirapatpimol, K.
name: Cho, H.-E.
name: Cho, K.
name: Cho, S.-J.
name: Choi, S.-K.
name: Choudhury, S.
name: Cochran, J.
name: Corona, L.
name: Cui, J. X.
name: Dattola, F.
name: De La Cruz-Burelo, E.
name: De La Motte, S. A.
name: de Marino, G.
name: De Nardo, G.
name: De Pietro, G.
name: de Sangro, R.
name: Destefanis, M.
name: Dey, S.
name: Dhamija, R.
name: Di Canto, A.
name: Di Capua, F.
name: Dingfelder, J.
name: Doležal, Z.
name: Domínguez Jiménez, I.
name: Dong, T. V.
name: Dorigo, M.
name: Dort, K.
name: Dossett, D.
name: Dubey, S.
name: Dugic, K.
name: Dujany, G.
name: Ecker, P.
name: Eliachevitch, M.
name: Feichtinger, P.
name: Ferber, T.
name: Fillinger, T.
name: Finck, C.
name: Finocchiaro, G.
name: Fodor, A.
name: Forti, F.
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name: Fulsom, B. G.
name: Gabrielli, A.
name: Ganiev, E.
name: Garcia-Hernandez, M.
name: Garg, R.
name: Gaudino, G.
name: Gaur, V.
name: Gaz, A.
name: Gellrich, A.
name: Ghevondyan, G.
name: Ghosh, D.
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name: Giakoustidis, G.
name: Giordano, R.
name: Giri, A.
name: Gironella Gironell, P.
name: Glazov, A.
name: Gobbo, B.
name: Godang, R.
name: Gogota, O.
name: Goldenzweig, P.
name: Gradl, W.
name: Graziani, E.
name: Greenwald, D.
name: Gruberová, Z.
name: Gu, T.
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name: Halder, S.
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name: Hayashii, H.
name: Hazra, S.
name: Hearty, C.
name: Hedges, M. T.
name: Heidelbach, A.
name: de la Cruz, I. Heredia
name: Hernández Villanueva, M.
name: Higuchi, T.
name: Hoek, M.
name: Hohmann, M.
name: Hoppe, R.
name: Horak, P.
name: Hsu, C.-L.
name: Humair, T.
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name: Ishikawa, A.
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name: Jacobs, W. W.
name: Jang, E.-J.
name: Jia, S.
name: Jin, Y.
name: Johnson, A.
name: Joo, K. K.
name: Junkerkalefeld, H.
name: Kaleta, M.
name: Kalita, D.
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name: Kang, S.
name: Karyan, G.
name: Kawasaki, T.
name: Keil, F.
name: Ketter, C.
name: Kiesling, C.
name: Kim, C.-H.
name: Kim, D. Y.
name: Kim, J.-Y.
name: Kim, K.-H.
name: Kim, Y.-K.
name: Kim, Y. J.
name: Kindo, H.
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name: Kodyš, P.
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name: Kohani, S.
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name: Korobov, A.
name: Korpar, S.
name: Kovalenko, E.
name: Kowalewski, R.
name: Križan, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kulii, Y.
name: Kumar, D.
name: Kumar, M.
name: Kumara, K.
name: Kunigo, T.
name: Kuzmin, A.
name: Kwon, Y.-J.
name: Lacaprara, S.
name: Lai, Y.-T.
name: Lalwani, K.
name: Lam, T.
name: Lanceri, L.
name: Lange, J. S.
name: Lau, T. S.
name: Laurenza, M.
name: Leboucher, R.
name: Le Diberder, F. R.
name: Lee, M. J.
name: Lemettais, C.
name: Leo, P.
name: Levit, D.
name: Lewis, P. M.
name: Li, C.
name: Li, L. K.
name: Li, Q. M.
name: Li, S. X.
name: Li, W. Z.
name: Li, Y.
name: Li, Y. B.
name: Liao, Y. P.
name: Libby, J.
name: Lin, J.
name: Liptak, Z.
name: Liu, M. H.
name: Liu, Q. Y.
name: Liu, Y.
name: Liu, Z. Q.
name: Liventsev, D.
name: Longo, S.
name: Lyu, C.
name: Ma, Y.
name: Madaan, C.
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name: Maharana, S. P.
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name: Maity, S.
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name: Marinas, C.
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name: Martens, A.
name: Martini, A.
name: Martinov, T.
name: Massaccesi, L.
name: Masuda, M.
name: Matsuda, T.
name: Matsuoka, K.
name: Matvienko, D.
name: Maurya, S. K.
name: Maushart, M.
name: McKenna, J. A.
name: Mehta, R.
name: Meier, F.
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name: Metzner, F.
name: Miller, C.
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name: Mitra, S.
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name: Mizuk, R.
name: Mohanty, G. B.
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name: Moser, H.-G.
name: Mrvar, M.
name: Mussa, R.
name: Nakamura, I.
name: Nakao, M.
name: Nakazawa, Y.
name: Naruki, M.
name: Natkaniec, Z.
name: Natochii, A.
name: Nayak, M.
name: Nazaryan, G.
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name: Niebuhr, C.
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name: Nishida, S.
name: Ogawa, S.
name: Onishchuk, Y.
name: Ono, H.
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name: Pakhlov, P.
name: Pakhlova, G.
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name: Park, H.
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name: Sumisawa, K.
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name: Suwonjandee, N.
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name: Takahashi, M.
name: Takizawa, M.
name: Tamponi, U.
name: Tanida, K.
name: Tenchini, F.
name: Thaller, A.
name: Tittel, O.
name: Tiwary, R.
name: Torassa, E.
name: Trabelsi, K.
name: Tsaklidis, I.
name: Ueda, I.
name: Uglov, T.
name: Unger, K.
name: Unno, Y.
name: Uno, K.
name: Uno, S.
name: Urquijo, P.
name: Ushiroda, Y.
name: Vahsen, S. E.
name: van Tonder, R.
name: Varvell, K. E.
name: Veronesi, M.
name: Vinokurova, A.
name: Vismaya, V. S.
name: Vitale, L.
name: Vobbilisetti, V.
name: Volpe, R.
name: Vossen, A.
name: Wach, B.
name: Wakai, M.
name: Wallner, S.
name: Wang, E.
name: Wang, M.-Z.
name: Wang, X. L.
name: Wang, Z.
name: Warburton, A.
name: Watanabe, M.
name: Watanuki, S.
name: Wessel, C.
name: Won, E.
name: Xu, X. P.
name: Yabsley, B. D.
name: Yamada, S.
name: Yan, W.
name: Yang, S. B.
name: Yelton, J.
name: Yin, J. H.
name: Yook, Y. M.
name: Yoshihara, K.
name: Yuan, C. Z.
name: Yuan, J.
name: Zani, L.
name: Zeng, F.
name: Zhang, B.
name: Zhilich, V.
name: Zhou, J. S.
name: Zhou, Q. D.
name: Zhukova, V. I.
name: Žlebčík, R.
name: Belle-II Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024

description: We present measurements of $B \to K{}^{*}(892)\gamma$ decays using $365\,{\rm fb}^{-1}$ of data collected from 2019 to 2022 by the Belle~II experiment at the SuperKEKB asymmetric-energy $e^+e^-$ collider. The data sample contains $(387 \pm 6) \times 10^6$$B\overline{B}$ events. We measure branching fractions ($\mathcal{B}$) and $C\!P$ asymmetries ($\mathcal{A}_{C\!P}$) for both $B^{0}\to K{}^{*0}\gamma$ and $B^{+}\to K{}^{*+}\gamma$ decays. The difference in $C\!P$ asymmetries ($\Delta \mathcal{A}_{C\!P}$) and the isospin asymmetry ($\Delta_{0+}$) between these neutral and charged channels are also measured. We obtain the following branching fractions and $C\!P$ asymmetries: $\mathcal{B} (B^{0} \to K{}^{*0}\gamma) = (4.14 \pm 0.10 \pm 0.11 ) \times 10^{-5}$, $\mathcal{B} (B^{+} \to K{}^{*+}\gamma) = (4.02 \pm 0.13 \pm 0.13 )\times 10^{-5}$, $\mathcal{A}_{C\!P} (B^{0} \to K{}^{*0}\gamma) = (-3.3 \pm 2.3 \pm 0.4 )\%$, and $\mathcal{A}_{C\!P} (B^{+} \to K{}^{*+}\gamma) = (-0.7 \pm 2.9 \pm 0.6 )\%$. The measured difference in $C\!P$ asymmetries is $\Delta \mathcal{A}_{C\!P} = (+2.6 \pm 3.8 \pm 0.7 )\%$, and the measured isospin asymmetry is $\Delta_{0+} = (+5.0 \pm 2.0 \pm 1.5 )\%$. The first uncertainties listed are statistical and the second are systematic. These results are consistent with world-average values and theory predictions.