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arXiv 2004.09552hep-ph
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$t\bar{t}W$多轻子特征的次主导EW修正和自旋相关效应

Subleading EW corrections and spin-correlation effects in $t\bar{t}W$ multi-lepton signatures

Rikkert Frederix, Ioannis Tsinikos

摘要:

最近,CMS和ATLAS合作在$t\bar{t}W$生产中报告了数据和预测之间的轻微紧张关系。我们重新审视这个过程的理论预测,重点关注以下两个效应。我们解开各种影响,导致轻子衰变产物的(反)顶夸克和$W$玻色子之间的不对称性,我们发现,自旋相关的顶夸克对是占主导地位的来源。我们还讨论了大型,正式subleading,电弱修正$t\bar{t}W$生产在大型强子对撞机的影响。我们发现,这种影响改变了$t\bar{t}W$截面显着的签名相空间区域,因此,应包括差异的理论数据比较。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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