论文标题
关于标量leptoquarks耦合到重型夸克风味
On Drell-Yan production of scalar leptoquarks coupling to heavy-quark flavours
论文作者
论文摘要
鉴于Leptonic $ b $衰减中Lepton-favour非通行的提示，Leptoquark（LQ）模型具有相当大的耦合到重型Quark风味的耦合，正在享受文艺复兴时期。尽管这种模型受到低能实验的严格约束，但在大型强子对撞机（LHC）的非共振DILEPTON搜索中也界定了与现象学相关的范围。 Based on the latest LHC dilepton analyses corresponding to an integrated luminosity of around $140 \, {\rm fb}^{-1}$ of proton-proton collisions at $\sqrt{s} = 13 \, {\rm TeV}$, we present improved limits on the scalar LQ couplings that involve heavy-quark flavours and light or heavy障碍。特别是，我们表明，在这种情况下，与实际QCD排放相关的领先顺序之外的效果是相关的，因为包含其他重型喷气式喷气机，显着改善了从高质量的Dilepton尾巴中得出的排除限制。还分析了电信校正和信号和背景之间的干扰效应的影响。在Powheg-box框架内，我们提供了专用的蒙特卡洛代码，该代码允许在本文中考虑的所有LQ校正。
Given the hints of lepton-flavour non-universality in semi-leptonic $B$ decays, leptoquark (LQ) models with sizeable couplings to heavy-quark flavours are enjoying a renaissance. While such models are subject to stringent constraints from low-energy experiments also bounds from non-resonant dilepton searches at the Large Hadron Collider (LHC) turn out to be phenomenologically relevant. Based on the latest LHC dilepton analyses corresponding to an integrated luminosity of around $140 \, {\rm fb}^{-1}$ of proton-proton collisions at $\sqrt{s} = 13 \, {\rm TeV}$, we present improved limits on the scalar LQ couplings that involve heavy-quark flavours and light or heavy dileptons. In particular, we show that effects beyond the leading order that are related to real QCD emissions are relevant in this context, since the inclusion of additional heavy-flavoured jets notably improves the exclusion limits that derive from the high-mass dilepton tails. The impact of electroweak corrections and interference effects between signal and background is also analysed. Within the POWHEG-BOX framework we provide a dedicated Monte Carlo code that allows for an on-the-fly signal event generation including all the LQ corrections considered in this article.
