Restoring good high energy behaviour in Higgs production via W fusion at the LHC

Details Restoring good high energy behaviour in Higgs production via W fusion at the LHC Restoring good high energy behaviour in Higgs production via W fusion at the LHC

1999-01-29

arxiv.org/abs/hep-ph/9901451v1

Eur.Phys.J.C9:181-195,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

32 pages, Latex, 11 figures as postscript files

Scientific paper

10.1007/s100529900050

The W-fusion scattering process W+W- --> ZZ for off-shell W bosons is studied, focusing on the issue of its high-energy behaviour which is known to be anomalous. It is shown that the unitarity violating terms can be isolated and extracted in a well-defined and efficient way using the pinch-technique. This restores the good high energy behaviour of the cross section and, in particular, makes possible the identification of the Higgs resonance in the invariant mass distribution M(ZZ) of the Z pair. The discarded terms, which are proportional to the off-shellness of the W bosons, cancel against similar terms originating from the remaining diagrams for the full physical process f1 f2 --> f1' f2' Z Z. This cancellation ensures the gauge invariance of our result, which therefore constitutes a meaningful separation between signal and background when they both contribute coherently. Equipped with this result, we are able to define a resonant approximation for the process p p --> Z Z + 2 jets + X, which circumvents the problem of good high energy behaviour without having to resort to the lengthy calculation of the complete set of diagrams. In this approximation only the W and Z fusion signal graphs are included, i.e. the ones which contain the Higgs resonance. We have verified that the approximate resonant cross section describes very well the full result not only close to the resonance but also beyond it.

Affiliated with

Also associated with

No associations

Rating

Restoring good high energy behaviour in Higgs production via W fusion at the LHC does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Restoring good high energy behaviour in Higgs production via W fusion at the LHC, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Restoring good high energy behaviour in Higgs production via W fusion at the LHC will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-615631