학술논문

Measurements of branching fractions and direct ${\it CP}$-violating asymmetries in $B^+ \to K^+ \pi^0~\mbox{and}~\pi^+ \pi^0$ decays using 2019 and 2020 Belle II data
Document Type
Working Paper
Author
Abudinén, 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.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
High Energy Physics - Phenomenology
Language
Abstract
We report measurements of branching fractions ($\mathcal B$) and direct ${\it CP}$-violating asymmetries ($\mathcal A_{\it CP}$) for the decays $B^+\to K^+\pi^0$ and $B^+ \to \pi^+\pi^0$ reconstructed with the Belle II detector in a sample of asymmetric-energy electron-positron collisions at the $\Upsilon(4S)$ resonance corresponding to 62.8 $\text{fb}^{-1}$ of integrated luminosity. The results are $\mathcal{B}(B^+ \to K^+\pi^0) = [11.9 ^{+1.1}_{-1.0} (\rm stat)\pm 1.6(\rm syst)]\times 10^{-6}$, $\mathcal{B}(B^+ \to \pi^+\pi^0) = [5.5 ^{+1.0}_{-0.9} (\rm stat)\pm 0.7(\rm syst)]\times 10^{-6}$, $\mathcal A_{\it CP}(B^+ \to K^+\pi^0) = -0.09 \pm 0.09 (\rm stat)\pm 0.03(\rm syst)$, and $\mathcal A_{\it CP}(B^+ \to \pi^+\pi^0) = -0.04 \pm 0.17 (\rm stat)\pm 0.06(\rm syst)$. The results are consistent with previous measurements and show a detector performance comparable with early Belle performance.
Comment: 23 pages, 10 figures. Supporting material for Winter 2021 conferences