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arXiv 0901.2427hep-phhep-ex
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通过胶子聚变产生希格斯粒子:Tevatron和LHC的最新截面

Higgs production through gluon fusion: updated cross sections at the Tevatron and the LHC

D. de Florian, M. Grazzini

摘要:

我们提出了强子碰撞中胶子-胶子融合产生希格斯玻色子的总截面的最新预测。我们的计算包括目前最先进的理论信息,可观察到:软胶子重混到下一个到下一个到领先的对数精度,下一个到领先的顺序,和双回路电弱效应的底夸克贡献的确切治疗。我们采用最新的参数化部分子分布函数在次-领先的顺序,我们评估相应的不确定性。与我们以前的中心预测相比,在Tevatron上,差异范围从m_H=115 GeV的+9%到m_H=200 GeV的-9%。在大型强子对撞机上,截面反而显著增加。这种效应从115 GeV的+30%增加到300 GeV的+9%,主要是由于新的部分子分布函数.我们还为LHC在sqrt{s}=10 TeV处提供了新的预测。

英文摘要:

We present updated predictions for the total cross section for Higgs boson production by gluon--gluon fusion in hadron collisions. Our calculation includes the most advanced theoretical information available at present for this observable: soft-gluon resummation up to next-to-next-to-leading logarithmic accuracy, the exact treatment of the bottom-quark contribution up to next-to-leading order, and two-loop electroweak effects. We adopt the most recent parametrization of parton distribution functions at next-to-next-to-leading order, and we evaluate the corresponding uncertainties. In comparison with our previous central predictions, at the Tevatron the difference ranges from +9% for m_H=115 GeV to -9% for m_H=200 GeV. At the LHC the cross section is instead significantly increased. The effect goes from +30% for m_H=115 GeV to +9% for m_H=300 GeV, and is mostly due to the new parton distribution functions. We also provide new predictions for the LHC at sqrt{s}=10 TeV.

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