Measurement of Time-dependent $CP$ Asymmetries in $B^{0}\to K_S^0 ηγ$ Decays

Nakano, H.; Ishikawa, A.; Sumisawa, K.; Yamamoto, H.; Adachi, I.; Aihara, H.; Said, S. Al; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.; Bansal, V.; Behera, P.; Beleno, C.; Bhuyan, B.; Bilka, T.; Biswal, J.; Bozek, A.; Bracko, M.; Cervenkov, D.; Chekelian, V.; Cheon, B. G.; Chilikin, K.; Cho, K.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cunliffe, S.; Dash, N.; Di Carlo, S.; Dolezal, Z.; Eidelman, S.; Fast, J. E.; Ferber, T.; Fulsom, B. G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Gelb, M.; Giri, A.; Goldenzweig, P.; Guan, Y.; Guido, E.; Haba, J.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hedges, M. T.; Hirose, S.; Hou, W. -S.; Iijima, T.; Inami, K.; Inguglia, G.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W. W.; Jaegle, I.; Jeon, H. B.; Jia, S.; Jin, Y.; Julius, T.; Kaliyar, A. B.; Karyan, G.; Kawasaki, T.; Kiesling, C.; Kim, D. Y.; Kim, H. J.; Kim, J. B.; Kim, K. T.; Kim, S. H.; Kinoshita, K.; Kodys, P.; Korpar, S.; Kotchetkov, D.; Krizan, P.; Kroeger, R.; Krokovny, P.; Kuhr, T.; Kulasiri, R.; Kumita, T.; Kwon, Y. -J.; Lange, J. S.; Lee, I. S.; Lee, S. C.; Li, L. K.; Li, Y.; Li, Y. B.; Gioi, L. Li; Libby, J.; Liventsev, D.; Lubej, M.; Luo, T.; MacNaughton, J.; Masuda, M.; Matsuda, T.; Merola, M.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Moon, H. K.; Mussa, R.; Nakano, E.; Nakao, M.; Nanut, T.; Nath, K. J.; Natkaniec, Z.; Nayak, M.; Niiyama, M.; Nishida, S.; Ogawa, S.; Okuno, S.; Ono, H.; Pakhlov, P.; Pakhlova, G.; Pal, B.; Pardi, S.; Park, H.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Popov, V.; Ritter, M.; Rostomyan, A.; Russo, G.; Sahoo, D.; Sakai, Y.; Salehi, M.; Sandilya, S.; Santelj, L.; Sanuki, T.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Schwartz, A. J.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shebalin, V.; Shen, C. P.; Shibata, T. -A.; Shimizu, N.; Shiu, J. -G.; Shwartz, B.; Simon, F.; Sokolov, A.; Solovieva, E.; Stanic, S.; Staric, M.; Strube, J. F.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Trabelsi, K.; Uchida, M.; Uglov, T.; Uno, S.; Urquijo, P.; Usov, Y.; Van Hulse, C.; Varner, G.; Vorobyev, V.; Vossen, A.; Wang, B.; Wang, C. H.; Wang, M. -Z.; Wang, P.; Wang, X. L.; Watanabe, M.; Widmann, E.; Won, E.; Ye, H.; Yuan, C. Z.; Yusa, Y.; Zakharov, S.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.; Zhulanov, V.; Zupanc, A.

doi:10.48550/arxiv.1803.07774

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2023

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“…The resulting dipion mass must be in the range of [487, 508] MeV/c 2 , which corresponds to ±3σ around the known K 0 mass [5], with σ being the mass resolution. To improve purity, we reject combinatorial background based on the output of a neural network for Belle [30] and a boosted decision tree (BDT) [31] for Belle II. For the latter one, 15 input variables are selected including kinematic quantities and the number of hits…”

Section: Event Selectionmentioning

confidence: 99%

Measurement of CP asymmetries and branching-fraction ratios for B± → DK± and Dπ± with D → $$ {K}_{\textrm{S}}^0 $$K±π∓ using Belle and Belle II data

Adachi,

Aggarwal,

Aihara

et al. 2023

J. High Energ. Phys.

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We measure CP asymmetries and branching-fraction ratios for B±→ DK± and Dπ± decays with D →$$ {K}_{\textrm{S}}^0 $$ K S 0 K±π∓, where D is a superposition of D0 and $$ \overline{D} $$ D ¯ 0. We use the full data set of the Belle experiment, containing 772 × 106$$ B\overline{B} $$ B B ¯ pairs, and data from the Belle II experiment, containing 387 × 106$$ B\overline{B} $$ B B ¯ pairs, both collected in electron-positron collisions at the Υ(4S) resonance. Our results provide model-independent information on the unitarity triangle angle ϕ3.

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Section: Event Selectionmentioning

confidence: 99%