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arXiv 0704.1344hep-ph
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强子对撞机上寻找SM希格斯玻色子的恢复效应

Resummation Effects in the Search of SM Higgs Boson at Hadron Colliders

Qing-Hong Cao, Chuan-Ren Chen

摘要:

在寻找标准模型希格斯玻色子的过程中,我们研究了软胶子的再激发效应,包括末态粒子之间的自旋关联。通过过程$gg\to H\to WW/ZZ \to 4 leptons, at the Tevatron and the LHC. A comparison between the resummation and the Next-to-Leading order (NLO) calculation is performed after imposing various kinematics cuts suggested in the literature for the Higgs boson search. For the $ H \to ZZ $ mode, the resummation effects increase the acceptance of the signal events by about 25%, as compared to the NLO prediction, and dramatically alter various kinematics distributions of the final state leptons. For the $ H \to WW$模式,再激发和NLO计算所预言的信号事件的接受率几乎相同,但某些预言的运动学分布却有很大的不同。因此,要精确地确定希格斯玻色子在强子对撞机上的性质,就必须考虑软胶子的再膨胀效应。

英文摘要:

We examine the soft-gluon resummation effects, including the exact spin correlations among the final state particles, in the search of the Standard Model Higgs boson, via the process $gg\to H\to WW/ZZ \to 4 leptons, at the Tevatron and the LHC. A comparison between the resummation and the Next-to-Leading order (NLO) calculation is performed after imposing various kinematics cuts suggested in the literature for the Higgs boson search. For the $H\to ZZ$ mode, the resummation effects increase the acceptance of the signal events by about 25%, as compared to the NLO prediction, and dramatically alter various kinematics distributions of the final state leptons. For the $H\to WW$ mode, the acceptance rates of the signal events predicted by the resummation and NLO calculations are almost the same, but some of the predicted kinematical distributions are quite different. Thus, to precisely determine the properties of the Higgs boson at hadron colliders, the soft-gluon resummation effects have to be taken into account.

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