论文标题
$ t \ bar {t} w $多勒普顿签名中的EW校正和自旋相关效应
Subleading EW corrections and spin-correlation effects in $t\bar{t}W$ multi-lepton signatures
论文作者
论文摘要
最近，CMS和ATLAS协作都在$ t \ bar {t} W $生产中报告了数据和预测之间的轻微张力。我们重新审视此过程的理论预测，重点是以下两种效果。我们消除了导致（反）顶级夸克和$ w $玻色子的松性衰减产物中不对称的各种效果，为此我们发现顶级Quark对中的自旋相关性是主要来源。我们还讨论了大型，正式的转向型电校正校正对$ t \ bar {t} w $生产的影响。我们发现，这种效果在签名相空间区域中大大改变了$ t \ bar {t} w $横截面，因此应将理论中的理论差异包括在数据比较中。
Recently a slight tension between data and predictions has been reported in $t\bar{t}W$ production by both the CMS and ATLAS collaborations. We revisit the theoretical predictions for this process, focussing on the following two effects. We disentangle various effects that lead to asymmetries among the leptonic decay products of the (anti-)top quarks and $W$ bosons, for which we find that the spin correlations in the top-quark pair are the dominant source. We also discuss the impact of the large, formally subleading, electroweak corrections to $t\bar{t}W$ production at the LHC. We find that this effect changes the $t\bar{t}W$ cross section significantly in the signature phase-space regions, and should therefore be included differentially in the theory to data comparisons.
