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    • Measurement Of The Charge Asymmetry In Top Quark Pair Production In Pp Collisions At S =8 Tev Using A Template Method

    user-5f8cf7e04c775ec6fa691c92（2016）

    Cited 10|Views43
    Abstract
    The charge asymmetry in the production of top quark and antiquark pairs is measured in proton-proton collisions at a center-of-mass energy of 8 TeV. The data, corresponding to an integrated luminosity of 19.6 inverse femtobarns, were collected by the CMS experiment at the LHC. Events with a single isolated electron or muon, and four or more jets, at least one of which is likely to have originated from hadronization of a bottom quark, are selected. A template technique is used to measure the asymmetry in the distribution of differences in the top quark and antiquark absolute rapidities. The measured asymmetry is A[c,y] = [0.33 +/- 0.26 (stat) +/- 0.33 (syst)]%, which is the most precise result to date. The results are compared to calculations based on the standard model and on several beyond-the-standard-model scenarios.
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    Key words
    B meson,Bottom quark,Top quark,Hadronization,Quark,Pair production,Asymmetry,Muon,Particle physics,Nuclear physics,Physics
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    【要点】：该论文通过模板方法测量了质子-质子碰撞中 топ-кварк-антикварк пар production的电荷不对称性，并得到了迄今为止最精确的结果，进一步与标准模型及超出标准模型的多种场景进行了比较。
    

    【方法】：使用模板技术测量top quark和antiquark的绝对快速度差异分布中的不对称性。
    

    【实验】：在LHC的CMS实验中，利用质心能量为8 TeV、总积分亮度为19.6逆飞姆托巴的数据，选取了包含单个孤立电子或μ子以及至少四个喷流（其中至少一个可能源于底夸克碎片化）的事件，测量结果为A[c,y] = [0.33 +/- 0.26 (统计) +/- 0.33 (系统)]%，并与标准模型及其他理论预测进行了对比。