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Gluon-gluon contributions to W+W− production and Higgs interference effects
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Journal Article
Gluon-gluon contributions to W+W− production and Higgs interference effects
2011
Overview
In this paper we complete our re-assessment of the production of
W
boson pairs at the LHC, by calculating analytic results for the
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,
. 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
m
H
< 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.
Publisher
Springer-Verlag,Springer Nature B.V
