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Measurement of C P asymmetries in B 0 → η ′ K S 0 decays at Belle II

We describe a measurement of charge-parity ( C P ) violation asymmetries in B 0 → η ′ K S 0 decays using Belle II data. We consider η ′ → η ( → γ γ ) π + π − and η ′ → ρ ( → π + π − ) γ decays. The data were collected at the SuperKEKB asymmetric-energy e + e − collider between the years 2019 and 202...

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Bibliographic Details
Published in:Physical review. D 2024-12, Vol.110 (11), Article 112002
Main Authors: Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Anh Ky, N., Asner, D. M., Atmacan, H., Aushev, T., Aushev, V., Aversano, M., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, Sw, Barrett, M., Baudot, J., Baur, A., Beaubien, A., Becherer, F., Becker, J., Bennett, J. V., Bernlochner, F. U., Bertacchi, V., Bertemes, M., Bertholet, E., Bessner, M., Bettarini, S., Bhuyan, B., Bianchi, F., Bilka, T., Bilokin, S., Biswas, D., Bobrov, A., Bodrov, D., Bolz, A., 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, M.-C., Chang, P., Cheema, P., Chen, C., Cheon, B. G., Chilikin, K., Chirapatpimol, K., Cho, H.-E., Cho, K., Cho, S.-J., Choi, S.-K., Choudhury, S., Corona, L., Das, S., Dattola, F., De La Cruz-Burelo, E., De La Motte, S. A., De Nardo, G., De Nuccio, M., De Pietro, G., de Sangro, R., Destefanis, M., Dhamija, R., Di Canto, A., Di Capua, F., Dingfelder, J., Doležal, Z., Dong, 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., Frey, A., Fulsom, B. G., Gabrielli, A., Ganiev, E., Garcia-Hernandez, M.
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Language:English
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Summary:We describe a measurement of charge-parity ( C P ) violation asymmetries in B 0 → η ′ K S 0 decays using Belle II data. We consider η ′ → η ( → γ γ ) π + π − and η ′ → ρ ( → π + π − ) γ decays. The data were collected at the SuperKEKB asymmetric-energy e + e − collider between the years 2019 and 2022, and contain ( 387 ± 6 ) × 10 6 bottom-antibottom meson pairs. We reconstruct 829 ± 35 signal decays and extract the C P violating parameters from a fit to the distribution of the proper-decay-time difference between the two B mesons. The measured direct and mixing-induced C P asymmetries are C η ′ K S 0 = − 0.19 ± 0.08 ± 0.03 and S η ′ K S 0 = + 0.67 ± 0.10 ± 0.03 , respectively, where the first uncertainties are statistical and the second are systematic. These results are in agreement with current world averages and standard model predictions.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.110.112002