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arXiv 1310.7601hep-phhep-ex
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希格斯玻色子截面的CTEQ-TEA整体分析

Higgs Boson Cross Section from CTEQ-TEA Global Analysis

Sayipjamal Dulat, Tie-Jiun Hou, Jun Gao, Joey Huston, Pavel Nadolsky, Jon Pumplin, Carl Schmidt, Daniel Stump, C. -P. Yuan

摘要:

我们研究了希格斯玻色子产生截面的不确定性,通过胶子融合子过程在大型强子对撞机($\sqrt s=7, 8$和$14$ TeV)所产生的部分子分布函数(PDF)的不确定性和强耦合常数$α_s(M_Z)$的值。这些不确定性计算的两个互补的方法,在CTEQ-TEA全球分析框架内的海森和拉格朗日乘数法的基础上。我们发现他们对希格斯玻色子截面的预测是一致的。此外,拉格朗日乘数法的结果支持我们之前提供的使用Hessian方法计算PDF和$α_s$组合不确定度的处方,并通过从$90\%$置信水平缩放它们来估计$68\%$置信水平下的不确定度。

英文摘要:

We study the uncertainties of the Higgs boson production cross section through the gluon fusion subprocess at the LHC (with $\sqrt s=7, 8$ and $14$ TeV) arising from the uncertainties of the parton distribution functions (PDFs) and of the value of the strong coupling constant $α_s(M_Z)$. These uncertainties are computed by two complementary approaches, based on the Hessian and the Lagrange Multiplier methods within the CTEQ-TEA global analysis framework. We find that their predictions for the Higgs boson cross section are in good agreement. Furthermore, the result of the Lagrange Multiplier method supports the prescriptions we have previously provided for using the Hessian method to calculate the combined PDF and $α_s$ uncertainties, and to estimate the uncertainties at the $68\%$ confidence level by scaling them from the $90\%$ confidence level.

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