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Measurements of charge and CP asymmetries in b-hadron decays using top-quark events collected by the ATLAS detector in pp collisions at root s=8 TeV

机译:使用ATLAS检测器在根s = 8 TeV的pp碰撞中由ATLAS检测器收集的顶夸克事件测量b-强子衰变中的电荷和CP不对称性

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摘要

Same- and opposite-sign charge asymmetries are measured in lepton+jets tt¯tt¯ events in which a b-hadron decays semileptonically to a soft muon, using data corresponding to an integrated luminosity of 20.3 fb−1 from proton-proton collisions at a centre-of-mass energy of s√=8s=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. The charge asymmetries are based on the charge of the lepton from the top-quark decay and the charge of the soft muon from the semileptonic decay of a b-hadron and are measured in a fiducial region corresponding to the experimental acceptance. Four CP asymmetries (one mixing and three direct) are measured and are found to be compatible with zero and consistent with the Standard Model.
机译:在轻子+射流tt事件中测量了相同符号和相反符号的不对称性,在该事件中,b子强子从半轻子衰变到软质子,使用了来自质子-质子碰撞时20.3 fb-1的积分光度的数据使用位于欧洲核子研究组织(CERN)的大型强子对撞机的ATLAS探测器收集的s√= 8s = 8 TeV质心能量。电荷不对称性基于顶部夸克衰变产生的轻子的电荷和b强子的半轻子衰变产生的软质子的电荷,并在与实验接受程度相对应的基准区域进行测量。测量了四个CP不对称(一个混合和三个直接),发现它们与零兼容并且与标准模型一致。

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