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arXiv 1605.01733hep-phhep-ex
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13 TeV LHC处$b\bar{b}H$截面的匹配预测

Matched predictions for the $b\bar{b}H$ cross section at the 13 TeV LHC

Marco Bonvini, Andrew S. Papanastasiou, Frank J. Tackmann

备注：
26 pages, 7 figures, 4 tables. Final version published in JHEP
发表信息：
JHEP10(2016)053
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摘要：

我们提出了最新的匹配预测$b\bar{b}H$包含截面在大型强子对撞机在$\sqrt{s}=13$ TeV。使用以前开发的方法，我们的预测始终结合完整的NLO贡献，是目前在4味方案计算，包括有限的b-夸克质量效应，以及顶环诱导$Y_b Y_t$干扰的贡献，与$m_b/m_H$的共线矩阵的重申，目前在5味方案计算到NNLO。我们提供了一个详细的估计的匹配结果的微扰不确定性，通过检查其依赖的因式分解和重整化尺度，汤川耦合的规模，以及低b-夸克匹配尺度的PDF。我们鼓励使用的$m_H$ /2，这是中间的值通常选择在4味和5味方案计算的中央重整化规模。我们评估的参数不确定性，由于PDF和b-夸克质量，特别是讨论如何系统地解开参数$m_b$依赖和非物理的b-夸克匹配标度依赖。在13 TeV和$m_H$ = 125 GeV的标准模型中，我们对$b\bar{b} H$产生截面的最佳预测是$σ(b\bar b H) = 0.52 \,{\rm pb}\, [1 \pm 9.6\% {\rm (perturbative)}\,{}^{+2.9\%}_{-3.6\%} {\rm (parametric)}]$。我们还提供了一系列的希格斯质量$m_H\in [50, 750]$ GeV的预测。我们的方法来计算匹配的预测和评估其不确定性可以很容易地应用到其他重夸克在大型强子对撞机启动的过程。

英文摘要：

We present up-to-date matched predictions for the $b\bar{b}H$ inclusive cross section at the LHC at $\sqrt{s}=13$ TeV. Using a previously developed method, our predictions consistently combine the complete NLO contributions that are present in the 4-flavor scheme calculation, including finite b-quark mass effects as well as top-loop induced $Y_b Y_t$ interference contributions, with the resummation of collinear logarithms of $m_b/m_H$ as present in the 5-flavor scheme calculation up to NNLO. We provide a detailed estimate of the perturbative uncertainties of the matched result by examining its dependence on the factorization and renormalization scales, the scale of the Yukawa coupling, and also the low b-quark matching scale in the PDFs. We motivate the use of a central renormalization scale of $m_H$/2, which is halfway between the values typically chosen in the 4-flavor and 5-flavor scheme calculations. We evaluate the parametric uncertainties due to the PDFs and the b-quark mass, and in particular discuss how to systematically disentangle the parametric $m_b$ dependence and the unphysical b-quark matching scale dependence. Our best prediction for the $b\bar{b} H$ production cross section in the Standard Model at 13 TeV and for $m_H$ = 125 GeV is $σ(b\bar b H) = 0.52 \,{\rm pb}\, [1 \pm 9.6\% {\rm (perturbative)}\,{}^{+2.9\%}_{-3.6\%} {\rm (parametric)}]$. We also provide predictions for a range of Higgs masses $m_H\in [50, 750]$ GeV. Our method to compute the matched prediction and to evaluate its uncertainty can be readily applied to other heavy-quark-initiated processes at the LHC.

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