1. Measurements of branching fractions and direct CP-violating asymmetries in $B^+ \to K^+ \pi^0$ and $\pi^+ \pi^0$ decays using 2019 and 2020 Belle II data
- Author
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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. Anh, Asner, 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., 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.-C., 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 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. Domínguez, Dong, 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., 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., Hadjivasiliou, C., Halder, S., Hara, K., Hara, T., Hartbrich, O., Hauth, T., Hayasaka, K., Hayashii, H., Hearty, C., Heck, M., Hedges, M.T., de la Cruz, I. Heredia, Villanueva, M. Hernández, Hershenhorn, A., Higuchi, T., Hill, E.C., Hirata, H., Hoek, M., Hohmann, M., Hollitt, S., Hotta, T., Hsu, C.-L., Hu, Y., Huang, K., Iijima, T., Inami, K., Inguglia, G., Jabbar, J. Irakkathil, Ishikawa, 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., 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, J.B., Kim, K.-H., Kim, S.-H., Kim, Y.-K., Kimmel, T.D., Kindo, H., Kinoshita, K., Kirby, B., Kleinwort, C., Knysh, B., Kodyš, P., Koga, T., Kohani, S., Komarov, I., Konno, T., Korpar, S., Kovalchuk, N., Kraetzschmar, T.M.G., 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., Lautenbach, K., Laycock, P.J., Le Diberder, F.R., Lee, I.-S., Lee, S.C., Leitl, P., Levit, D., Lewis, P.M., Li, C.-H., Li, L.K., Li, S.X., Li, Y.M., Li, Y.B., Libby, J., Lieret, K., Gioi, L. Li, Lin, 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., 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. Mora, Morda, A., Morii, 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, C., 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., 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. Rodríguez, Roney, 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., 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. Wan, Wang, B., Wang, C.H., Wang, M.-Z., Wang, X.L., Warburton, A., Watanabe, M., Watanuki, S., Watson, I., Webb, J., Wehle, S., Welsch, M., Wessel, C., Wiechczynski, J., Wieduwilt, P., Windel, H., Won, E., Wu, L.J., Xu, X.P., Yabsley, B., Yamada, S., Yan, W., Yang, S.B., Ye, H., Yelton, J., Yeo, I., Yin, J.H., Yonenaga, M., Yook, Y.M., Yoshinobu, T., Yuan, C.Z., Yuan, G., Yuan, W., Yusa, Y., Zani, L., Zhang, J.Z., Zhang, Y., Zhang, Z., Zhilich, V., Zhou, Q.D., Zhou, X.Y., Zhukova, V.I., Zhulanov, V., Zupanc, A., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Belle-II
- Subjects
Upsilon(10570): electroproduction ,detector: performance ,B+: branching ratio: measured ,BELLE ,electron positron: colliding beams ,electron positron: annihilation ,asymmetry: CP ,KEK-B ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,B+: hadronic decay ,CP: violation ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,+pi%2B+pi0%22">B+ --> pi+ pi0 ,+K%2B+pi0%22">B+ --> K+ pi0 ,experimental results - 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.
- Published
- 2021