We report results from a study of B±→ DK± decays followed by D decaying to the CP-even final state K+K− and CP-odd final state KS0π0, where D is an admixture of D0 and D¯0 states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle ϕ3. The results are based on a combined analysis of the final data set of 772 × 106BB¯ pairs collected by the Belle experiment and a data set of 198 × 106BB¯ pairs collected by the Belle II experiment, both in electron-positron collisions at the Υ(4S) resonance. We measure the CP asymmetries to be ACP+ = (+12.5 ± 5.8 ± 1.4)% and ACP− = (−16.7 ± 5.7 ± 0.6)%, and the ratios of branching fractions to be RCP+ = 1.164 ± 0.081 ± 0.036 and RCP− = 1.151 ± 0.074 ± 0.019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries ACP+ and ACP− have similar magnitudes and opposite signs; their difference corresponds to 3.5 standard deviations. From these values we calculate 68.3% confidence intervals of (8.5° < ϕ3 < 16.5°) or (84.5° < ϕ3 < 95.5°) or (163.3° < ϕ3 < 171.5°) and 0.321 < rB < 0.465.

Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II / The Belle II, C., Null, N., Adachi, I., Aggarwal, L., 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., Barrett, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2024:5(2024), pp. 212.1-212.25. [10.1007/jhep05(2024)212]

Measurement of branching-fraction ratios and CP asymmetries in B± → DCP±K± decays at Belle and Belle II

Dattola, F.;Gabrielli, A.;Ganiev, E.;Gaudino, G.;Ghosh, D.;Giordano, R.;Gobbo, B.;Johnson, A.;Kumar, R.;Lanceri, L.;Li, Y.;Mancinelli, G.;Manfredi, R.;Mantovano, M.;Martini, A.;Merola, M.;Park, H.;Raiz, S.;Rizzuto, L. B.;Schnell, G.;Serrano, J.;Soffer, A.;Vitale, L.;
2024-01-01

Abstract

We report results from a study of B±→ DK± decays followed by D decaying to the CP-even final state K+K− and CP-odd final state KS0π0, where D is an admixture of D0 and D¯0 states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle ϕ3. The results are based on a combined analysis of the final data set of 772 × 106BB¯ pairs collected by the Belle experiment and a data set of 198 × 106BB¯ pairs collected by the Belle II experiment, both in electron-positron collisions at the Υ(4S) resonance. We measure the CP asymmetries to be ACP+ = (+12.5 ± 5.8 ± 1.4)% and ACP− = (−16.7 ± 5.7 ± 0.6)%, and the ratios of branching fractions to be RCP+ = 1.164 ± 0.081 ± 0.036 and RCP− = 1.151 ± 0.074 ± 0.019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries ACP+ and ACP− have similar magnitudes and opposite signs; their difference corresponds to 3.5 standard deviations. From these values we calculate 68.3% confidence intervals of (8.5° < ϕ3 < 16.5°) or (84.5° < ϕ3 < 95.5°) or (163.3° < ϕ3 < 171.5°) and 0.321 < rB < 0.465.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3097939
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