在LHC生产$tHj$和$tZj$的NLO QCD + EW预测
NLO QCD+EW predictions for $tHj$ and $tZj$ production at the LHC
摘要：
本文在NLO QCD+EW精度下计算了单个顶夸克或反夸克与Higgs（$tHj$）或$Z$玻色子（$tZj$）的强子产生截面.在$tZj$生产的情况下，我们考虑的情况下的$Z$玻色子未衰变和完整的最终状态$t \ell^+ \ell^- j$，包括离壳和非共振效应。我们在五味方案（5 FS）中进行计算，而不选择任何特定的生产通道（$s$ -、$t$ -或相关的$tW$）。此外，我们提供了一个更现实的估计理论的不确定性仔细包括四味方案（4FS）和5 FS预测之间的差异。这个过程中存在的EW校正的困难进行了详细讨论。我们发现，只有当味方案不确定度（4FS与~ 5 FS）的情况下进行考虑。对于$t \ell^+ \ell^- j$生产的情况下，我们还调查NLO QCD+EW预测和NLO QCD预测匹配的部分子簇射模拟，包括多光子发射之间的差异。
英文摘要：
In this work we calculate the cross sections for the hadroproduction of a single top quark or antiquark in association with a Higgs ($tHj$) or $Z$ boson ($tZj$) at NLO QCD+EW accuracy. In the case of $tZj$ production we consider both the case of the $Z$ boson undecayed and the complete final state $t \ell^+ \ell^- j$, including off-shell and non-resonant effects. We perform our calculation in the five-flavour-scheme (5FS), without selecting any specific production channel ($s$-, $t$- or $tW$ associated). Moreover, we provide a more realistic estimate of the theory uncertainty by carefully including the differences between the four-flavour-scheme (4FS) and 5FS predictions. The difficulties underlying this procedure in the presence of EW corrections are discussed in detail. We find that NLO EW corrections are in general within the NLO QCD theory uncertainties only if the flavour scheme uncertainty (4FS vs.~5FS) is taken into account. For the case of $t \ell^+ \ell^- j$ production we also investigate differences between NLO QCD+EW predictions and NLO QCD predictions matched with a parton shower simulation including multiple photon emissions.
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