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A next-to-leading order study of photon-pion and pion pair hadro-production in the light of the Higgs boson search at the LHC

T. Binoth·J. P. Guillet·E. Pilon·M. Werlen
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Abstract

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.

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T. Binoth, J. P. Guillet, E. Pilon, M. Werlen. 2002-05-09. A next-to-leading order study of photon-pion and pion pair hadro-production in the light of the Higgs boson search at the LHC. https://arxiv.org/abs/hep-ph/0203064

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