Measurement of C P Asymmetries in B 0 → K S 0 π 0 γ Decays at Belle II

We report measurements of time-dependent C P asymmetries in B 0 → K S 0 π 0 γ decays based on a data sample of ( 388 ± 6 ) × 10 6 B B ¯ events collected at the ϒ ( 4 S ) resonance with the Belle II detector. The Belle II experiment operates at the SuperKEKB asymmetric-energy e + e − collider. We mea...

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Veröffentlicht in:	Physical review letters 2025-01, Vol.134 (1), Article 011802
Hauptverfasser:	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., Ayad, R., Babu, V., Bae, H., Bahinipati, S., Bambade, P., Banerjee, Sw, Bansal, S., 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., Bierwirth, L., Bilka, T., Bilokin, S., Biswas, D., Bodrov, D., Bolz, A., Bondar, A., Borah, J., Boschetti, A., 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., Cheaib, R., Cheema, P., 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., Cui, J. X., 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., Dey, S., Dhamija, R., Di Canto, A., Di Capua, F., Dingfelder, J., Doležal, Z., Domínguez Jiménez, I., Dong, T. V., Dorigo, M., Dorner, D., Dort, K., Dossett, D., Dreyer, S., Dubey, S., Dugic, K., Dujany, G., Ecker, P., Eliachevitch, M., Feichtinger, P., Ferber, T.
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Sprache:	eng
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Zusammenfassung:	We report measurements of time-dependent C P asymmetries in B 0 → K S 0 π 0 γ decays based on a data sample of ( 388 ± 6 ) × 10 6 B B ¯ events collected at the ϒ ( 4 S ) resonance with the Belle II detector. The Belle II experiment operates at the SuperKEKB asymmetric-energy e + e − collider. We measure decay-time distributions to determine C P -violating parameters S and C . We determine these parameters for two ranges of K S 0 π 0 invariant mass: m ( K S 0 π 0 ) ∈ ( 0.8 , 1.0 ) GeV / c 2 , which is dominated by B 0 → K * 0 ( → K S 0 π 0 ) γ decays, and a complementary region m ( K S 0 π 0 ) ∈ ( 0.6 , 0.8 ) ∪ ( 1.0 , 1.8 ) GeV / c 2 . Our results have improved precision as compared to previous measurements and are consistent with theory predictions.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.134.011802