Measurement of the Lepton Forward-Backward Asymmetry in B → Xs l+ l- Decays with a Sum of Exclusive Modes

Measurement of the Lepton Forward-Backward Asymmetry in B → Xs l+ l- Decays with a Sum of Exclusive Modes
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B → Xs l+ l- 中轻子前向-后向不对称性的测量与独占模式之和

DOI:
10.1103/physrevd.93.032008
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发表时间:
2016
期刊:
影响因子:
5
通讯作者:
Y. Sato et al (Belle Collaboration)
Y. Sato et al (Belle Collaboration)
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
○芝山啓充;藤森悠介;竹内裕紀;上田善弘;古田巧;川端猛夫;Y. Sato et al (Belle Collaboration)

文献摘要

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我们报告了轻子的前后不对称性的第一次测量,作为双轻子系统的平方四动量的函数,对于具有排他最终态和的电弱企鹅过程,其中一个是电子或介子,一个是带夸克的强子反冲系统。这些结果是基于一个数据样本,其中包含了KEKBcollider上Belle探测器在y (4S)共振中记录的对子对。因为包含量是由不变质量小于的10个排他态的和推断出来的。对于,在水平上被排除,其中是标准偏差。因为,结果在标准模型的理论期望范围内。
We report the first measurement of the lepton forward-backward asymmetryas a function of the squared four-momentum of the dilepton system,, for the electroweak penguin processwith a sum of exclusive final states, whereis an electron or a muon andis a hadronic recoil system with anquark. The results are based on a data sample containingpairs recorded at the ϒ(4S) resonance with the Belle detector at the KEKBcollider.for the inclusiveis extrapolated from the sum of 10 exclusivestates whose invariant mass is less than. For,is excluded at thelevel, whereis the standard deviation. For, the result is withinof the standard model theoretical expectation.