Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-03-06
Eur.Phys.J.direct C4 (2002) 7
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages Latex, 14 eps figures, replaced by published version
Scientific paper
We discuss the production of photon-pion and pion pairs with a large invariant mass at collider energies. We present a study based on a perturbative QCD calculation at full next-to-leading order accuracy, implemented in the computer programme DIPHOX. We give estimations for various observables, which concern the reducible background to the Higgs boson search in the channel H --> gamma gamma, in the mass range 80-140 GeV at the LHC. We critically discuss the reliability of these estimates due to our imperfect knowledge of fragmentation functions at high z and a subtle interplay between higher order corrections and realistic experimental cuts. We conclude that, whereas the invariant mass spectrum of photon-pion pairs is theoretically better under control, in the dipion case large uncertainties remain.
Binoth Thomas
Guillet J.-Ph.
Pilon Eric
Werlen Monique
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