"Table 2" of "Measurement of the forward-backward asymmetry of electron and muon pair-production in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector"

The Observable is calculated as a function of the di-lepton invariant mass. The forward backward asymmetry has been calculated at detector level and then corrected with an unfolding technique. Two corrections are applied: detector resolution and QED radiative corrections (namely mass bin migration), dilution. The results are presented for the cases when only the mass bin migration correction has been applied and when both the mass bin migration and dilution corrections have been applied. A measurements of $A_{FB}$ at Dressed level is also shown. The forward-backward asymmetry has been calculated for three different final states: electron Central-Central (CC), electron Central-Forward (CF) and muons. CC electrons are required to have $p_{T}>25$ GeV and $|\eta|<2.4$, CF electrons are required to have $p_{T}>25$ GeV, one electron with $|\eta|<2.4$ and one electron with $2.5<|\eta|<4.9$. Muons are required to have $p_{T}>20$ GeV and $|\eta|<2.4$. The $A_{FB}$ has been calculated for di-lepton invariant-masses $66

观测量被构造为双轻子不变质量（di-lepton invariant mass）的函数。前向-后向不对称性（forward-backward asymmetry，A_FB）首先在探测器层级完成计算，随后通过解褶积技术（unfolding technique）进行修正。本次分析共施加两项修正：其一为探测器分辨率修正与QED辐射修正（具体为质量箱迁移效应），其二为稀释修正（dilution）。研究结果针对两种修正方案分别展示：仅施加质量箱迁移修正，以及同时施加质量箱迁移与稀释修正。此外还展示了裸层级（Dressed level）下的A_FB测量结果。前向-后向不对称性针对三种不同末态进行计算：电子中心-中心（CC）、电子中心-前向（CF）以及μ子。其中CC电子需满足横动量（transverse momentum, p_T）>25 GeV且赝快度（pseudorapidity, |η|）<2.4；CF电子需满足p_T>25 GeV，且其中一个电子的|η|<2.4，另一个电子满足2.5<|η|<4.9；μ子则需满足p_T>20 GeV且|η|<2.4。本次计算针对双轻子不变质量66。