학술논문

Measurement of $C\!P$ violation in $B^{0}\rightarrow K_{S}^{0}\pi^{0}$ decays at Belle II
Document Type
Working Paper
Author
Belle II CollaborationAdachi, I.Adamczyk, K.Aggarwal, L.Ahmed, H.Aihara, H.Akopov, N.Aloisio, A.Ky, N. AnhAsner, D. M.Atmacan, H.Aushev, T.Aushev, V.Aversano, M.Babu, V.Bae, H.Bahinipati, S.Bambade, P.Banerjee, Sw.Barrett, M.Baudot, J.Bauer, M.Baur, A.Beaubien, A.Becker, J.Behera, P. K.Bennett, J. V.Bertacchi, V.Bertemes, M.Bertholet, E.Bessner, M.Bettarini, S.Bhuyan, B.Bianchi, F.Bilka, T.Biswas, D.Bodrov, D.Bondar, A.Borah, J.Bozek, A.Bračko, M.Branchini, P.Briere, R. A.Browder, T. E.Budano, A.Bussino, S.Campajola, M.Cao, L.Casarosa, G.Cecchi, C.Cerasoli, J.Chang, P.Cheaib, R.Cheema, P.Chekelian, V.Chen, C.Cheon, B. G.Chilikin, K.Chirapatpimol, K.Cho, H. -E.Cho, K.Cho, S. -J.Choi, S. -K.Choudhury, S.Cochran, J.Corona, L.Cremaldi, L. M.Das, S.Dattola, F.De La Cruz-Burelo, E.De La Motte, S. A.de Marino, G.De Nuccio, M.De Pietro, G.de Sangro, R.Destefanis, M.De Yta-Hernandez, A.Dhamija, R.Di Canto, A.Di Capua, F.Dingfelder, J.Doležal, Z.Jiménez, I. DomínguezDong, T. V.Dorigo, M.Dort, K.Dreyer, S.Dubey, S.Dujany, G.Ecker, P.Eliachevitch, M.Feichtinger, P.Ferber, T.Ferlewicz, D.Fillinger, T.Finck, C.Finocchiaro, G.Fodor, A.Forti, F.Fulsom, B. G.Gabrielli, A.Ganiev, E.Garcia-Hernandez, M.Garg, R.Garmash, A.Gaudino, G.Gaur, V.Gaz, A.Gellrich, A.Ghosh, D.Giakoustidis, G.Giordano, R.Giri, A.Glazov, A.Gobbo, B.Godang, R.Goldenzweig, P.Gradl, W.Grammatico, T.Granderath, S.Graziani, E.Greenwald, D.Gruberová, Z.Gu, T.Guan, Y.Gudkova, K.Halder, S.Han, Y.Hara, K.Hara, T.Hayasaka, K.Hayashii, H.Hazra, S.Hearty, C.Hedges, M. T.de la Cruz, I. HerediaVillanueva, M. HernándezHershenhorn, A.Higuchi, T.Hill, E. C.Hoek, M.Hohmann, M.Hsu, C. -L.Humair, T.Iijima, T.Inami, K.Ipsita, N.Ishikawa, A.Ito, S.Itoh, R.Iwasaki, M.Jackson, P.Jacobs, W. W.Jang, E. -J.Ji, Q. P.Jia, S.Jin, Y.Johnson, A.Joo, K. K.Junkerkalefeld, H.Kaleta, M.Kaliyar, A. B.Kandra, J.Kang, K. H.Kang, S.Kar, S.Karyan, G.Kawasaki, T.Keil, F.Ketter, C.Kiesling, C.Kim, C. -H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kindo, H.Kodyš, P.Koga, T.Kohani, S.Kojima, K.Korobov, A.Korpar, S.Kovalenko, E.Kowalewski, R.Kraetzschmar, T. M. G.Križan, P.Krokovny, P.Kuhr, T.Kumar, J.Kumar, M.Kumara, K.Kunigo, T.Kuzmin, A.Kwon, Y. -J.Lacaprara, S.Lai, Y. -T.Lam, T.Lange, J. S.Laurenza, M.Leboucher, R.Diberder, F. R. LeLeitl, P.Levit, D.Li, C.Li, L. K.Libby, J.Liu, Q. Y.Liu, Z. Q.Liventsev, D.Longo, S.Lueck, T.Luo, T.Lyu, C.Ma, Y.Maggiora, M.Maharana, S. P.Maiti, R.Maity, S.Mancinelli, G.Manfredi, R.Manoni, E.Mantovano, M.Marcantonio, D.Marcello, S.Marinas, C.Martel, L.Martellini, C.Martinov, T.Massaccesi, L.Masuda, M.Matsuda, T.Matsuoka, K.Matvienko, D.Maurya, S. K.McKenna, J. A.Mehta, R.Meier, F.Merola, M.Metzner, F.Milesi, M.Miller, C.Mirra, M.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Molina-Gonzalez, N.Mondal, S.Moneta, S.Moser, H. -G.Mrvar, M.Mussa, R.Nakamura, I.Nakazawa, Y.Charan, A. NarimaniNaruki, M.Natochii, A.Nayak, L.Nayak, M.Nazaryan, G.Nisar, N. K.Nishida, S.Ono, H.Onuki, Y.Oskin, P.Pakhlov, P.Pakhlova, G.Paladino, A.Paoloni, E.Pardi, S.Parham, K.Park, H.Park, S. -H.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Peschke, R.Pestotnik, R.Pham, F.Piccolo, M.Piilonen, L. E.Podesta-Lerma, P. L. M.Podobnik, T.Pokharel, S.Praz, C.Prell, S.Prencipe, E.Prim, M. T.Purwar, H.Rad, N.Rados, P.Raeuber, G.Raiz, S.Reif, M.Reiter, S.Remnev, M.Ripp-Baudot, I.Rizzo, G.Robertson, S. H.Roehrken, M.Roney, J. M.Rostomyan, A.Rout, N.Russo, G.Sahoo, D.Sandilya, S.Sangal, A.Santelj, L.Sato, Y.Savinov, V.Scavino, B.Schmitt, C.Schwanda, C.Schwartz, A. J.Seino, Y.Selce, A.Senyo, K.Serrano, J.Sevior, M. E.Sfienti, C.Shan, W.Sharma, C.Shi, X. D.Shillington, T.Shiu, J. -G.Shtol, D.Sibidanov, A.Simon, F.Singh, J. B.Skorupa, J.Sobie, R. J.Sobotzik, M.Soffer, A.Sokolov, A.Solovieva, E.Spataro, S.Spruck, B.Starič, M.Stavroulakis, P.Stefkova, S.Stottler, Z. S.Stroili, R.Sumihama, M.Sumisawa, K.Sutcliffe, W.Svidras, H.Takahashi, M.Takizawa, M.Tamponi, U.Tanaka, S.Tanida, K.Tenchini, F.Thaller, A.Tittel, O.Tiwary, R.Tonelli, D.Torassa, E.Trabelsi, K.Tsaklidis, I.Uchida, M.Ueda, I.Uglov, T.Unger, K.Unno, Y.Uno, K.Uno, S.Urquijo, P.Ushiroda, Y.Vahsen, S. E.van Tonder, R.Varner, G. S.Varvell, K. E.Vinokurova, A.Vismaya, V. S.Vitale, L.Wach, B.Wakai, M.Wakeling, H. M.Wallner, S.Wang, E.Wang, M. -Z.Wang, Z.Warburton, A.Watanabe, M.Watanuki, S.Welsch, M.Wessel, C.Won, E.Xu, X. P.Yabsley, B. D.Yamada, S.Yan, W.Yang, S. B.Yin, J. H.Yoshihara, K.Yuan, C. Z.Yusa, Y.Zani, L.Zhang, Y.Zhilich, V.Zhou, Q. D.Zhukova, V. I.
Source
PRL 131, 111803 (2023)
Subject
High Energy Physics - Experiment
Language
Abstract
We report a measurement of the $C\!P$-violating parameters $A$ and $S$ in $B^{0}\to K_{S}^{0} \pi^{0}$ decays at Belle II using a sample of $387\times 10^{6}$ $B\bar{B}$ events recorded in $e^{+}e^{-}$ collisions at a center-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. These parameters are determined by fitting the proper decay-time distribution of a sample of 415 signal events. We obtain $A = 0.04^{+0.15}_{-0.14}\pm 0.05$ and $S = 0.75^{+0.20}_{-0.23}\pm 0.04$, where the first uncertainties are statistical and the second are systematic.