论文标题
RIP $ h b \ bar b $：其他希格斯生产模式如何共同杀死LHC的罕见信号
RIP $H b \bar b$: How other Higgs production modes conspire to kill a rare signal at the LHC
论文作者
论文摘要
Higgs Boson与底部Quark对（$ H B \ B \ B $）相关的HADRRODUCTION通常被认为是直接探测Higgs Boson和Bottom Quark（$ y__b $）之间的Yukawa互动的关键过程。但是，在标准模型（SM）中，此过程也众所周知，其他HIGGS生产渠道的不可还原背景很大，尤其是Gluon融合（$ GG $ F）。在本文中，我们首次使用四燃烧方案，首次计算出$ h b \ b $ b $生产的所谓QCD和electroweak完整的NLO预测。我们的计算表明，不仅$ gg $ f，而且$ zh $，甚至矢量 - 玻璃融合频道也是可观的背景。此外，我们证明，在LHC上，相对于“真正的”和$ y_b $依赖的$ h b \ bar b $生产模式，这些背景的速度非常大。特别是，没有抑制在差异水平上发生，因此背景在典型的分析削减中存活。这一事实进一步危害了LHC在SM中的$ h b \ b \ b $生产的$ y_b $依赖组件的机会。特别是，除非新物理学大大扩大$ y_b $，否则即使在SM方案中，通过此过程的直接确定$ Y_B $的直接确定似乎在LHC上似乎是没有希望的。
The hadroproduction of a Higgs boson in association with a bottom-quark pair ($H b \bar b$) is commonly considered as the key process for directly probing the Yukawa interaction between the Higgs boson and the bottom quark ($y_b$). However, in the Standard-Model (SM) this process is also known to suffer from very large irreducible backgrounds from other Higgs production channels, notably gluon-fusion ($gg$F). In this paper we calculate for the first time the so-called QCD and electroweak complete-NLO predictions for $H b \bar b$ production, using the four-flavour scheme. Our calculation shows that not only the $gg$F but also the $ZH$ and even the vector-boson fusion channels are sizeable irreducible backgrounds. Moreover, we demonstrate that, at the LHC, the rates of these backgrounds are very large with respect to the "genuine" and $y_b$-dependent $H b \bar b$ production mode. In particular, no suppression occurs at the differential level and therefore backgrounds survive typical analysis cuts. This fact further jeopardises the chances of measuring at the LHC the $y_b$-dependent component of $H b \bar b$ production in the SM. Especially, unless $y_b$ is significantly enlarged by new physics, even for beyond-the SM scenarios the direct determination of $y_b$ via this process seems to be hopeless at the LHC.
