论文标题
$ t \ bar {t} J $实验分析的理论输入的不确定性在LHC
Uncertainties on the theoretical input for $t\bar{t}j$ experimental analyses at the LHC
论文作者
论文摘要
顶级质量质量的精确度量构成了LHC Top-Quark物理计划的主要目标之一。提取此参数的一种可能性使用$ρ_ {\ mathrm {s}} $分布，这取决于$ t \ bar {t} j $ system的不变质量。为了充分利用LHC上顶级夸克产量横截面的实验精度，理论不确定性需要很好地控制。我们介绍了改变理论计算的输入参数对预测的$ρ_ {\ mathrm {s}} $分布的效果的研究。因此，我们研究了$ r $参数在JET重建过程中的影响，以及各种重新归一化和分解量表定义和不同PDF集的影响。对于$ρ_{\ mathrm {s}} $ - 在其他微分发行版中也发现了类似于此处介绍的行为。
The precise measurement of the top-quark mass constitutes one of the main goals of the LHC top-quark physics program. One possibility to extract this parameter uses the $ρ_{\mathrm{s}}$ distribution, which depends on the invariant mass of the $t\bar{t}j$ system. To fully take advantage of the experimental accuracy achievable in measuring top quark production cross sections at the LHC, the theory uncertainties need to be well under control. We present a study of the effect of varying the input parameters of the theoretical calculation on the predicted $ρ_{\mathrm{s}}$ distribution. Thereby we studied the influence of the $R$ parameter in the jet reconstruction procedure, as well as the effect of various renormalization and factorization scale definitions and different PDF sets. A behaviour similar to the one presented here for the $ρ_{\mathrm{s}}$-distribution was also found for other differential distributions.
