학술논문

Measurement of the photon-energy spectrum in inclusive $B\rightarrow X_{s}\gamma$ decays identified using hadronic decays of the recoil $B$ meson in 2019-2021 Belle II data
Document Type
Working Paper
Author
Belle II CollaborationAbudinén, F.Adachi, I.Adamczyk, K.Aggarwal, L.Ahlburg, P.Ahmed, H.Ahn, J. K.Aihara, H.Akopov, N.Aloisio, A.Ameli, F.Andricek, L.Ky, N. AnhAsner, D. M.Atmacan, H.Aulchenko, V.Aushev, T.Aushev, V.Aziz, T.Babu, V.Bacher, S.Bae, H.Baehr, S.Bahinipati, S.Bakich, A. M.Bambade, P.Banerjee, Sw.Bansal, S.Barrett, M.Batignani, G.Baudot, J.Bauer, M.Baur, A.Beaubien, A.Beaulieu, A.Becker, J.Behera, P. K.Bennett, J. V.Bernieri, E.Bernlochner, F. U.Bertacchi, V.Bertemes, M.Bertholet, E.Bessner, M.Bettarini, S.Bhardwaj, V.Bhuyan, B.Bianchi, F.Bilka, T.Bilokin, S.Biswas, D.Bobrov, A.Bodrov, D.Bolz, A.Bondar, A.Bonvicini, G.Bozek, A.Bračko, M.Branchini, P.Braun, N.Briere, R. A.Browder, T. E.Brown, D. N.Budano, A.Burmistrov, L.Bussino, S.Campajola, M.Cao, L.Casarosa, G.Cecchi, C.Červenkov, D.Chang, M. -C.Chang, P.Cheaib, R.Cheema, P.Chekelian, V.Chen, C.Chen, Y. Q.Chen, Y. -T.Cheon, B. G.Chilikin, K.Chirapatpimol, K.Cho, H. -E.Cho, K.Cho, S. -J.Choi, S. -K.Choudhury, S.Cinabro, D.Corona, L.Cremaldi, L. M.Cunliffe, S.Czank, T.Das, S.Dash, N.Dattola, F.De La Cruz-Burelo, E.De La Motte, S. A.de Marino, G.De Nardo, G.De Nuccio, M.De Pietro, G.de Sangro, R.Deschamps, B.Destefanis, M.Dey, S.De Yta-Hernandez, A.Dhamija, R.Di Canto, A.Di Capua, F.Di Carlo, S.Dingfelder, J.Doležal, Z.Jiménez, I. DomínguezDong, T. V.Dorigo, M.Dort, K.Dossett, D.Dreyer, S.Dubey, S.Duell, S.Dujany, G.Ecker, P.Eidelman, S.Eliachevitch, M.Epifanov, D.Feichtinger, P.Ferber, T.Ferlewicz, D.Fillinger, T.Finck, C.Finocchiaro, G.Fischer, P.Flood, K.Fodor, A.Forti, F.Frey, A.Friedl, M.Fulsom, B. G.Gabriel, M.Gabrielli, A.Gabyshev, N.Ganiev, E.Garcia-Hernandez, M.Garg, R.Garmash, A.Gaur, V.Gaz, A.Gebauer, U.Gellrich, A.Gemmler, J.Geßler, T.Ghevondyan, G.Giakoustidis, G.Giordano, R.Giri, A.Glazov, A.Gobbo, B.Godang, R.Goldenzweig, P.Golob, B.Gomis, P.Gong, G.Grace, P.Gradl, W.Granderath, S.Graziani, E.Greenwald, D.Gu, T.Guan, Y.Gudkova, K.Guilliams, J.Hadjivasiliou, C.Halder, S.Hara, K.Hara, T.Hartbrich, O.Hayasaka, K.Hayashii, H.Hazra, S.Hearty, C.Hedges, M. T.de la Cruz, I. HerediaVillanueva, M. HernándezHershenhorn, A.Higuchi, T.Hill, E. C.Hirata, H.Hoek, M.Hohmann, M.Hollitt, S.Hotta, T.Hsu, C. -L.Huang, K.Humair, T.Iijima, T.Inami, K.Inguglia, G.Ipsita, N.Jabbar, J. IrakkathilIshikawa, A.Ito, S.Itoh, R.Iwasaki, M.Iwasaki, Y.Iwata, S.Jackson, P.Jacobs, W. W.Jaffe, D. E.Jang, E. -J.Jeandron, M.Jeon, H. B.Ji, Q. P.Jia, S.Jin, Y.Joo, C.Joo, K. K.Junkerkalefeld, H.Kadenko, I.Kahn, J.Kakuno, H.Kaleta, M.Kaliyar, A. B.Kandra, J.Kang, K. H.Kang, S.Kapusta, P.Karl, R.Karyan, G.Kato, Y.Kawai, H.Kawasaki, T.Ketter, C.Kichimi, H.Kiesling, C.Kim, C. -H.Kim, D. Y.Kim, H. J.Kim, K. -H.Kim, K.Kim, S. -H.Kim, Y. -K.Kim, Y.Kimmel, T. D.Kindo, H.Kinoshita, K.Kleinwort, C.Knysh, B.Kodyš, P.Koga, T.Kohani, S.Kojima, K.Komarov, I.Konno, T.Korobov, A.Korpar, S.Kovalchuk, N.Kovalenko, E.Kowalewski, R.Kraetzschmar, T. M. G.Krinner, F.Križan, P.Kroeger, R.Krohn, J. F.Krokovny, P.Krüger, H.Kuehn, W.Kuhr, T.Kumar, J.Kumar, M.Kumar, R.Kumara, K.Kumita, T.Kunigo, T.Künzel, M.Kurz, S.Kuzmin, A.Kvasnička, P.Kwon, Y. -J.Lacaprara, S.Lai, Y. -T.La Licata, C.Lalwani, K.Lam, T.Lanceri, L.Lange, J. S.Laurenza, M.Lautenbach, K.Laycock, P. J.Leboucher, R.Diberder, F. R. LeLee, I. -S.Lee, S. C.Leitl, P.Levit, D.Lewis, P. M.Li, C.Li, L. K.Li, S. X.Li, Y. B.Libby, J.Lieret, K.Lin, J.Liptak, Z.Liu, Q. Y.Liu, Z. A.Liventsev, D.Longo, S.Loos, A.Lozar, A.Lu, P.Lueck, T.Luetticke, F.Luo, T.Lyu, C.MacQueen, C.Maggiora, M.Maiti, R.Maity, S.Manfredi, R.Manoni, E.Manthei, A.Marcello, S.Marinas, C.Martel, L.Martini, A.Martinov, T.Massaccesi, L.Masuda, M.Matsuda, T.Matsuoka, K.Matvienko, D.McKenna, J. A.McNeil, J.Meggendorfer, F.Meier, F.Merola, M.Metzner, F.Milesi, M.Miller, C.Miyabayashi, K.Miyake, H.Miyata, H.Mizuk, R.Azmi, K.Mohanty, G. B.Molina-Gonzalez, N.Moneta, S.Moon, H.Moon, T.Grimaldo, J. A. MoraMorii, T.Moser, H. -G.Mrvar, M.Müller, F. J.Muller, Th.Muroyama, G.Murphy, C.Mussa, R.Nakamura, I.Nakamura, K. R.Nakano, E.Nakao, M.Nakayama, H.Nakazawa, H.Charan, A. NarimaniNaruki, M.Natkaniec, Z.Natochii, A.Nayak, L.Nayak, M.Nazaryan, G.Neverov, D.Niebuhr, C.Niiyama, M.Ninkovic, J.Nisar, N. K.Nishida, S.Nishimura, K.Nouxman, M. H. A.Ogawa, K.Ogawa, S.Olsen, S. L.Onishchuk, Y.Ono, H.Onuki, Y.Oskin, P.Otani, F.Oxford, E. R.Ozaki, H.Pakhlov, P.Pakhlova, G.Paladino, A.Pang, T.Panta, A.Paoloni, E.Pardi, S.Parham, K.Park, H.Park, S. -H.Paschen, B.Passeri, A.Pathak, A.Patra, S.Paul, S.Pedlar, T. K.Peruzzi, I.Peschke, R.Pestotnik, R.Pham, F.Piccolo, M.Piilonen, L. E.Angioni, G. PinnaPodesta-Lerma, P. L. M.Podobnik, T.Pokharel, S.Polat, L.Popov, V.Praz, C.Prell, S.Prencipe, E.Prim, M. T.Purohit, M. V.Purwar, H.Rad, N.Rados, P.Raiz, S.Morales, A. RamirezRasheed, R.Rauls, N.Reif, M.Reiter, S.Remnev, M.Ripp-Baudot, I.Ritter, M.Ritzert, M.Rizzo, G.Rizzuto, L. B.Röhrken, M.Robertson, S. H.Pérez, D. RodríguezRoney, J. M.Rosenfeld, C.Rostomyan, A.Rout, N.Rozanska, M.Russo, G.Sahoo, D.Sakai, Y.Sanders, D. A.Sandilya, S.Sangal, A.Santelj, L.Sartori, P.Sato, Y.Savinov, V.Scavino, B.Schnepf, M.Schram, M.Schreeck, H.Schueler, J.Schwanda, C.Schwartz, A. J.Schwenker, B.Schwickardi, M.Seino, Y.Selce, A.Senyo, K.Seong, I. S.Serrano, J.Sevior, M. E.Sfienti, C.Shebalin, V.Shen, C. P.Shibuya, H.Shillington, T.Shimasaki, T.Shiu, J. -G.Shwartz, B.Sibidanov, A.Simon, F.Singh, J. B.Skambraks, S.Skorupa, J.Smith, K.Sobie, R. J.Soffer, A.Sokolov, A.Soloviev, Y.Solovieva, E.Spataro, S.Spruck, B.Starič, M.Stefkova, S.Stottler, Z. S.Stroili, R.Strube, J.Stypula, J.Sue, Y.Sugiura, R.Sumihama, M.Sumisawa, K.Sumiyoshi, T.Sutcliffe, W.Suzuki, S. Y.Svidras, H.Tabata, M.Tackmann, K.Takahashi, M.Takizawa, M.Tamponi, U.Tanaka, S.Tanida, K.Tanigawa, H.Taniguchi, N.Tao, Y.Taras, P.Tenchini, F.Tiwary, R.Tonelli, D.Torassa, E.Toutounji, N.Trabelsi, K.Tsaklidis, I.Tsuboyama, T.Tsuzuki, N.Uchida, M.Ueda, I.Uehara, S.Uematsu, Y.Ueno, T.Uglov, T.Unger, K.Unno, Y.Uno, K.Uno, S.Urquijo, P.Ushiroda, Y.Usov, Y. V.Vahsen, S. E.van Tonder, R.Varner, G. S.Varvell, K. E.Vinokurova, A.Vitale, L.Vobbilisetti, V.Vorobyev, V.Vossen, A.Wach, B.Waheed, E.Wakeling, H. M.Wan, K.Abdullah, W. WanWang, B.Wang, C. H.Wang, E.Wang, M. -Z.Wang, X. L.Warburton, A.Watanabe, M.Watanuki, S.Webb, J.Wehle, S.Welsch, M.Wessel, C.Wiechczynski, J.Wieduwilt, P.Windel, H.Won, E.Wu, L. J.Xu, X. P.Yabsley, B. D.Yamada, S.Yan, W.Yang, S. B.Ye, H.Yelton, J.Yin, J. H.Yonenaga, M.Yook, Y. M.Yoshihara, K.Yoshinobu, T.Yuan, C. Z.Yusa, Y.Zani, L.Zhai, Y.Zhang, J. Z.Zhang, Y.Zhang, Z.Zhilich, V.Zhou, J.Zhou, Q. D.Zhou, X. Y.Zhukova, V. I.Zhulanov, V.Žlebčík, R.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We measure the photon-energy spectrum in radiative bottom-meson ($B$) decays into inclusive final states involving a strange hadron and a photon. We use SuperKEKB electron-positron collisions corresponding to $189~\mathrm{fb}^{-1}$ of integrated luminosity collected at the $\Upsilon(4S)$ resonance by the Belle II experiment. The partner $B$ candidates are fully reconstructed using a large number of hadronic channels. The $B \rightarrow X_s \gamma$ partial branching fractions are measured as a function of photon energy in the signal $B$ meson rest frame in eight bins above $1.8~\mathrm{GeV}$. The background-subtracted signal yield for this photon energy region is $343 \pm 122$ events. Integrated branching fractions for three photon energy thresholds of $1.8~\mathrm{GeV}$, $2.0~\mathrm{GeV}$, and $2.1~\mathrm{GeV}$ are also reported, and found to be in agreement with world averages.
Comment: 14 pages, 3 figures