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arXiv 2111.01427hep-phhep-ex
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与顶夸克有关的希格斯玻色子玻色子的产生和衰变

Production and decay of the Higgs boson in association with top quarks

Daniel Stremmer, Malgorzata Worek

摘要:

本文计算了与顶夸克有关的希格斯玻色子玻色子产生和衰变的次低阶QCD修正。我们考虑了在具有$\sqrt{s}=13$ TeV的大型强子对撞机上,顶夸克轻子衰变导致强子过程$pp\to e^+ν_e\, μ^-\barν_μ\, b\bar{b}\,H\, (H\to X)$。所有的共振以及非共振费曼图,干扰和离壳效应的顶夸克和$W$规范玻色子。另一方面,希格斯玻色子玻色子的衰变则包含在窄宽度近似中。具体来说,我们考虑希格斯玻色子衰变为$b\bar{b}$,$τ^+τ^-$,$γγ$和$e^+e^-e^+e^-$。数值结果给出了在集成和差分置信水平的各种因子分解和重正化尺度的选择和不同的PDF集。我们研究的主要理论不确定性,忽略高阶项的微扰展开和不同的参数化的PDF。此外,我们研究的离壳效应的大小,通过一个明确的比较,在全窄宽度近似的计算。最后,研究了底夸克部分子密度对量子贡献的影响。

英文摘要:

We report on the calculation of the next-lo-leading order QCD corrections to Higgs boson production and decay in association with top quarks. We consider leptonic decays of top quarks leading to the hadronic process $pp\to e^+ν_e\, μ^-\barν_μ\, b\bar{b}\,H\, (H\to X)$ at the LHC with $\sqrt{s}=13$ TeV. All resonant as well as non-resonant Feynman diagrams, interferences and off-shell effects are included for the top quark and $W$ gauge boson. Decays of the Higgs boson, on the other hand, are included in the narrow-width-approximation. Specifically, we consider Higgs boson decays into $b\bar{b}$, $τ^+τ^-$, $γγ$ and $e^+e^-e^+e^-$. Numerical results are given at the integrated and differential fiducial level for various factorisation and renormalisation scale choices and different PDF sets. We study the main theoretical uncertainties that are associated with neglected higher order terms in the perturbative expansion and with different parametrisations of the PDFs. Furthermore, we examine the size of the off-shell effects by an explicit comparison to the calculation in the full narrow-width-approximation. Finally, the impact of the contributions induced by the bottom-quark parton density is investigated.

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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