Measurement of the forward-backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set
Measurement of the forward-backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set
复制标题
使用完整的 CDF Run II 数据集测量顶夸克和反夸克对的前后不对称性
DOI：
10.1103/physrevd.93.112005
复制
发表时间：
2016
影响因子：
5
通讯作者：
Aaltonen T
中科院分区：
文献类型：
--
作者：
Aaltonen T
我们利用费米实验室（CDF）的Tevatron Run II对撞机探测器收集的完整数据集，测量了质能中心质子-反质子碰撞中顶夸克和反夸克对产生的前后不对称性。这种不对称性的特征是顶夸克和反夸克之间的速度差异（），并在最终状态下用两个带电轻子（电子和介子）测量。对整个相空间在部分子水平上的不对称性进行校正后，测量结果与标准模型（SM）和之前的CDF结果在单个带电轻子的最终状态下的预期一致。包含两种最终状态的CDF测量结果的组合产生，这与SM预测一致。我们也测量微分不对称作为的函数。假设在处不对称为零，线性拟合得到斜率为，这与SM预测和先前在单带电轻子的最终状态下的CDF测定一致。两种最终状态的联合斜率为，大于SM预测。
We measure the forward–backward asymmetry of the production of top-quark and antiquark pairs in proton-antiproton collisions at center-of-mass energyusing the full data set collected by the Collider Detector at Fermilab (CDF) in Tevatron Run II corresponding to an integrated luminosity of. The asymmetry is characterized by the rapidity difference between top quarks and antiquarks () and measured in the final state with two charged leptons (electrons and muons). The inclusive asymmetry, corrected to the entire phase space at parton level, is measured to be, consistent with the expectations from the standard model (SM) and previous CDF results in the final state with a single charged lepton. The combination of the CDF measurements of the inclusivein both final states yields, which is consistent with the SM predictions. We also measure the differential asymmetry as a function of. A linear fit to, assuming zero asymmetry at, yields a slope of, consistent with the SM prediction and the previous CDF determination in the final state with a single charged lepton. The combined slope ofin the two final states is, which islarger than the SM prediction.