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

被引：1
|
作者：
Adachi, I.
Aggarwal, L.
Aihara, H.
Akopov, N.
Aloisio, A.
Ky, N. Anh
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.
Baudot, J.
Bauer, M.
Baur, A.
Beaubien, A.
Becherer, F.
Becker, J.
Behera, P. K.
Belous, K.
Bennett, J. V.
Bernlochner, F. U.
Bertacchi, V.
Bertemes, M.
Bertholet, E.
Bessner, M.
Bettarini, S.
Bhuyan, B.
Bianchi, F.
Bilka, T.
Biswas, D.
Bobrov, A.
Bodrov, D.
Bolz, A.
Bondar, A.
Borah, J.
Bozek, A.
Bracko, M.
Branchini, P.
Briere, R. A.
Browder, T. E.
Budano, A.
Bussino, S.
Campajola, M.
机构：
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2024年 / 06期
基金：
新加坡国家研究基金会; 欧洲研究理事会; 欧盟地平线“2020”; 以色列科学基金会; 国家重点研发计划; 澳大利亚研究理事会; 日本学术振兴会; 加拿大自然科学与工程研究理事会; 美国国家科学基金会; 中国国家自然科学基金; 奥地利科学基金会;
关键词：
B Physics; CKM Angle Gamma; CP Violation; e(+)-e(-) Experiments; VIOLATION;
D O I：
10.1007/JHEP05(2024)212
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
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 K-S(0)pi(0), where D is an admixture of D-0 and (D) over bar (0) states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle phi(3). The results are based on a combined analysis of the final data set of 772 x 10(6) B (B) over bar pairs collected by the Belle experiment and a data set of 198 x 10(6) B (B) over bar pairs collected by the Belle II experiment, both in electron-positron collisions at the Y(4S) resonance. We measure the CP asymmetries to be A(CP+) = (+12.5 +/- 5.8 +/- 1.4)% and A(CP-) = (-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 A(CP+) and A(CP-) 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 degrees < phi(3) < 16.5 degrees) or (84.5 degrees < phi(3) < 95.5 degrees) or (163.3 degrees < phi(3) < 171.5 degrees) and 0.321 < r(B) < 0.465.
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页数：26
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