Measurement of the branching fraction and time-dependent CP asymmetry for B0→J/ψπ0 decays

Measurement of the branching fraction and time-dependent CP asymmetry for B0→J/ψπ0 decays
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B0-J/ÏÏ0 衰变的支化分数和时间依赖性 CP 不对称性的测量

DOI:
10.1103/physrevd.98.112008
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发表时间:
2018
期刊:
影响因子:
5
通讯作者:
Badhrees, I.
Badhrees, I.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Pal, B.;Schwartz, A. J.;Aihara, H.;Al Said, S.;Asner, D. M.;Atmacan, H.;Aulchenko, V.;Aushev, T.;Ayad, R.;Badhrees, I.

文献摘要

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我们利用在KEKB对撞机上进行的贝儿实验收集的数据样本测量了衰变的分支分数和依赖于时间的破坏不对称性。支化率为B(B 0 →J/π π0)=[1.62±0.11(stat)±0.06(syst)]×10-5,这是迄今为止最精确的测量。测得的非对称性参数为A=-0.15 0. 14(stat)+0.04-0.03(syst)。混合诱导的不对称性()与无违反的情况相差3.0个标准差,而直接对称性()与零一致。
We measure the branching fraction and time-dependent-violating asymmetry fordecays using a data sample ofcollected on the ϒ(4S) resonance by the Belle experiment running at the KEKBcollider. The branching fraction is measured to be B(B0→J/ψπ0)=[1.62±0.11(stat)±0.06(syst)]×10-5, which is the most precise measurement to date. The measuredasymmetry parameters areand A=-0.15±0.14(stat)+0.04-0.03(syst). The mixing-inducedasymmetry () differs from the case of noviolation by 3.0 standard deviations, and the directasymmetry () is consistent with zero.