학술논문

Measurement of the branching fraction for $B^{0} \rightarrow \pi^{0} \pi^{0}$ decays reconstructed in 2019-2020 Belle II data
Document Type
Working Paper
Author
Belle II CollaborationAbudinén, F.Adachi, I.Adak, R.Adamczyk, K.Ahlburg, P.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.Baehr, S.Bahinipati, S.Bakich, A. M.Bambade, P.Banerjee, Sw.Bansal, S.Barrett, M.Batignani, G.Baudot, J.Beaulieu, A.Becker, J.Behera, P. K.Bender, M.Bennett, J. V.Bernieri, E.Bernlochner, F. U.Bertemes, M.Bertholet, E.Bessner, M.Bettarini, S.Bhardwaj, V.Bhuyan, B.Bianchi, F.Bilka, T.Bilokin, S.Biswas, D.Bobrov, 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.Caria, G.Casarosa, G.Cecchi, C.Červenkov, D.Chang, M. -C.Chang, P.Cheaib, R.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.Cuesta, D.Cunliffe, S.Czank, T.Dash, N.Dattola, F.De La Cruz-Burelo, E.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.Di Canto, A.Di Capua, F.Di Carlo, S.Dingfelder, J.Doležal, Z.Jiménez, I. DomínguezDong, T. V.Dort, K.Dossett, D.Dubey, S.Duell, S.Dujany, G.Eidelman, S.Eliachevitch, M.Epifanov, D.Fast, J. E.Ferber, T.Ferlewicz, D.Fillinger, T.Finocchiaro, G.Fiore, S.Fischer, P.Fodor, A.Forti, F.Frey, A.Friedl, M.Fulsom, B. G.Gabriel, M.Gabyshev, N.Ganiev, E.Garcia-Hernandez, M.Garg, R.Garmash, A.Gaur, V.Gaz, A.Gebauer, U.Gelb, M.Gellrich, A.Gemmler, J.Geßler, T.Getzkow, D.Giordano, R.Giri, A.Glazov, A.Gobbo, B.Godang, R.Goldenzweig, P.Golob, B.Gomis, P.Grace, P.Gradl, W.Graziani, E.Greenwald, D.Guan, Y.Gudkova, K.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.Hu, Y.Huang, K.Humair, T.Iijima, T.Inami, K.Inguglia, G.Jabbar, J. IrakkathilIshikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Iwata, S.Jackson, P.Jacobs, W. W.Jaegle, I.Jaffe, D. E.Jang, E. -J.Jeandron, M.Jeon, H. B.Jia, S.Jin, Y.Joo, C.Joo, K. K.Junkerkalefeld, H.Kadenko, I.Kahn, J.Kakuno, H.Kaliyar, A. B.Kandra, J.Kang, K. H.Kapusta, P.Karl, R.Karyan, G.Kato, Y.Kawai, H.Kawasaki, T.Keck, T.Ketter, C.Kichimi, H.Kiesling, C.Kim, B. H.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.Kirby, B.Kleinwort, C.Knysh, B.Kodyš, P.Koga, T.Kohani, S.Komarov, I.Konno, T.Korobov, A.Korpar, S.Kovalchuk, N.Kovalenko, E.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.Lanceri, L.Lange, J. S.Laurenza, M.Lautenbach, K.Laycock, P. J.Diberder, F. R. LeLee, I. -S.Lee, S. C.Leitl, P.Levit, D.Lewis, P. M.Li, C.Li, C. -H.Li, L. K.Li, S. X.Li, Y. B.Libby, J.Lieret, K.Gioi, L. LiLin, J.Liptak, Z.Liu, Q. Y.Liu, Z. A.Liventsev, D.Longo, S.Loos, A.Lu, P.Lubej, M.Lueck, T.Luetticke, F.Luo, T.Lyu, C.MacQueen, C.Maeda, Y.Maggiora, M.Maity, S.Manfredi, R.Manoni, E.Marcello, S.Marinas, C.Martini, A.Masuda, M.Matsuda, T.Matsuoka, K.Matvienko, D.McNeil, J.Meggendorfer, F.Mei, J. C.Meier, F.Merola, M.Metzner, F.Milesi, M.Miller, C.Miyabayashi, K.Miyake, H.Miyata, H.Mizuk, R.Azmi, K.Mohanty, G. B.Moon, H.Moon, T.Grimaldo, J. A. MoraMorii, T.Moser, H. -G.Mrvar, M.Mueller, F.Müller, F. J.Muller, Th.Muroyama, G.Murphy, C.Mussa, R.Nakagiri, K.Nakamura, I.Nakamura, K. R.Nakano, E.Nakao, M.Nakayama, H.Nakazawa, H.Nanut, T.Natkaniec, Z.Natochii, A.Nayak, M.Nazaryan, G.Neverov, D.Niebuhr, C.Niiyama, M.Ninkovic, J.Nisar, N. K.Nishida, S.Nishimura, K.Nishimura, M.Nouxman, M. H. A.Oberhof, B.Ogawa, K.Ogawa, S.Olsen, S. L.Onishchuk, Y.Ono, H.Onuki, Y.Oskin, P.Oxford, E. R.Ozaki, H.Pakhlov, P.Pakhlova, G.Paladino, A.Pang, T.Panta, A.Paoloni, E.Pardi, S.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.Podesta-Lerma, P. L. M.Polat, G.Popov, V.Praz, C.Prell, S.Prencipe, E.Prim, M. T.Purohit, M. V.Rad, N.Rados, P.Raiz, S.Rasheed, R.Reif, M.Reiter, S.Remnev, M.Resmi, P. K.Ripp-Baudot, I.Ritter, M.Ritzert, M.Rizzo, G.Rizzuto, L. B.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.Sasaki, J.Sato, Y.Savinov, V.Scavino, B.Schram, M.Schreeck, H.Schueler, J.Schwanda, C.Schwartz, A. J.Schwenker, B.Seddon, R. M.Seino, Y.Selce, A.Senyo, K.Seong, I. S.Serrano, J.Sevior, M. E.Sfienti, C.Shebalin, V.Shen, C. P.Shibuya, H.Shiu, J. -G.Shwartz, B.Sibidanov, A.Simon, F.Singh, J. B.Skambraks, S.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.Sumihama, M.Sumisawa, K.Sumiyoshi, T.Summers, D. J.Sutcliffe, W.Suzuki, K.Suzuki, S. Y.Svidras, H.Tabata, M.Takahashi, M.Takizawa, M.Tamponi, U.Tanaka, S.Tanida, K.Tanigawa, H.Taniguchi, N.Tao, Y.Taras, P.Tenchini, F.Tonelli, D.Torassa, E.Trabelsi, K.Tsuboyama, T.Tsuzuki, N.Uchida, M.Ueda, I.Uehara, S.Ueno, T.Uglov, T.Unger, K.Unno, Y.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.Vorobyev, V.Vossen, A.Wach, B.Waheed, E.Wakeling, H. M.Wan, K.Abdullah, W. WanWang, B.Wang, C. H.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.Yeo, I.Yin, J. H.Yonenaga, M.Yook, Y. M.Yoshihara, K.Yoshinobu, T.Yuan, C. Z.Yuan, G.Yusa, Y.Zani, L.Zhang, J. Z.Zhang, Y.Zhang, Z.Zhilich, V.Zhou, J.Zhou, Q. D.Zhou, X. Y.Zhukova, V. I.Zhulanov, V.Zupanc, A.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We report the first reconstruction of the $B^{0} \to \pi^{0} \pi^{0}$ decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 fb$^{-1}$ of integrated luminosity. We find $14.0^{+6.8}_{-5.6}$ signal decays, corresponding to a significance of 3.4 standard deviations and determine a branching ratio of $\mathcal{B}(B^{0} \rightarrow \pi^{0} \pi^{0}) = [0.98^{+0.48}_{-0.39} \pm 0.27] \times 10^{-6}$. The results agree with previous determinations and contribute important information to an early assessment of detector performance and Belle II's potential for future determinations of $\alpha/\phi_2$ using $B \rightarrow \pi \pi$ modes.
Comment: 19 pages, 4 figures. Supporting material for Moriond 2021 conference