强子对撞机Drell-Yan双轻子对前后不对称性测量的简单事件加权技术
A simple event weighting technique for optimizing the measurement of the forward-backward asymmetry of Drell-Yan dilepton pairs at hadron colliders
摘要：
本文描述了一种简单的方法，用于优化强子对撞机上$\bar{p}p$和$pp$碰撞产生的Drell-Yan轻子对（$e^+e^-$，$ μ^+μ^-$）的前后不对称性（$A_{fb}$）的提取.该方法采用简单的事件权重，这是轻子对的快度和$cosθ$衰变角的函数。它产生的接受校正部分子水平（$\bar{q}q$）的前向后不对称性作为最终状态双轻子质量（$M_{\ell\ell}$）的函数的最佳估计。通常，与简单计数方法相比，该技术分别将$\bar{p}p$和$pp$冲突的统计误差减少了20%和40%。该技术可用于寻找新的高质量和大宽度Z'玻色子，通过观察与标准模型对前后不对称性的期望的偏差，可以最好地检测到这些玻色子。此外，我们还导出了Drell-Yan事件的QCD角系数的表达式。
英文摘要：
We describe a simple technique for optimizing the extraction of the forward-backward asymmetry ($A_{fb}$) of Drell-Yan lepton pairs ($e^+e^-$,$ μ^+μ^-$) produced in $\bar{p}p$ and $pp$ collisions at hadron colliders. The method employs simple event weights which are functions of the rapidity and $cosθ$ decay angle of the lepton pair. It yields the best estimate of the acceptance corrected parton level ($\bar{q}q$) forward backward asymmetry as a function of final state dilepton mass ($M_{\ell\ell}$). Typically, when compared to the simple count method, the technique reduces the statistical errors by 20% for $\bar{p}p$, and 40% for $pp$ collisions, respectively. The technique can be used to search for new high mass and large width Z' bosons which may be best detected through the observation of deviations from the Standard Model expectation for the forward-backward asymmetry. In addition, we derive expressions for the QCD angular coefficients for Drell-Yan events.
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