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arXiv 1107.5569hep-phhep-ex
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胶子-胶子对W+ W-产生和Higgs干涉效应的贡献

Gluon-gluon contributions to W+ W- production and Higgs interference effects

John M. Campbell, R. Keith Ellis, Ciaran Williams

摘要:

在本文中,我们通过计算gg -> W+ W- ->(νl lν)过程的解析结果,包括在环中循环的重夸克的影响,完成了我们对LHC中W玻色子对产生的重新评估。与包含前两代无质量夸克在圈中传播的单圈振幅一起,这些图可以给出大胶子通量的显著贡献。这个计算的组成部分之一是产生一个标准模型希格斯玻色子,gg -> H及其随后的衰变,H -> W+(-> νl)W-(-> l ν)。我们将量化的重要性之间的干扰希格斯玻色子玻色子的生产过程和胶子诱导的连续生产的背景下,寻找希格斯玻色子玻色子在Tevatron和大型强子对撞机。例如,对于mH < 140 GeV,干扰的影响通常会导致希格斯信号事件的预期数量减少约10%。这种干扰的大部分是由于非共振贡献。因此,在横向质量上的切割,例如ATLAS协作组目前使用的那些切割,将相消干涉减少到约1%的效果。我们主张在未来的希格斯粒子搜索中使用最大横向质量的切割。

英文摘要:

In this paper we complete our re-assessment of the production of W boson pairs at the LHC, by calculating analytic results for the gg -> W+ W- -> (νl lν) process including the effect of massive quarks circulating in the loop. Together with the one-loop amplitudes containing the first two generations of massless quarks propagating in the loop, these diagrams can give a significant contribution with a large flux of gluons. One of the component parts of this calculation is the production of a standard model Higgs boson, gg -> H and its subsequent decay, H -> W+(-> νl) W-(-> l ν). We will quantify the importance of the interference between the Higgs boson production process and the gluon-induced continuum production in the context of searches for the Higgs boson at the Tevatron and the LHC. For instance, for mH < 140 GeV the effect of the interference typically results in around a 10% reduction in the expected number of Higgs signal events. The majority of this interference is due to non-resonant contributions. Therefore cuts on the transverse mass such as those currently used by the ATLAS collaboration reduce the destructive interference to about a 1% effect. We advocate that a cut on the maximum transverse mass be used in future Higgs searches in this channel.

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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