Reference : High-energy resummation of direct photon production at hadronic colliders
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/9074
High-energy resummation of direct photon production at hadronic colliders
English
Diana, Giovanni mailto [Universita di Milano and INFN > Dipartimento di Fisica]
Rojo, Juan [Universita di Milano > Dipartimento di Fisica]
Ball, Richard D. [University of Edinburgh > School of Physics and Astronomy]
2010
Physics Letters B
Elsevier
693
4
430--437
Yes
International
[en] Perturbative QCD ; Resummation ; LHC physics
[en] Direct photon production is an important process at hadron colliders, being relevant
both for precision measurement of the gluon density, and as background to Higgs and other
new physics searches. Here we explore the implications of recently derived results for high
energy resummation of direct photon production for the interpretation of measurements
at the Tevatron and the LHC. The effects of resummation are compared to various sources
of theoretical uncertainties like PDFs and scale variations. We show how the high–energy
resummation procedure stabilizes the logarithmic enhancement of the cross section at
high–energy which is present at any fixed order in the perturbative expansion starting at
NNLO. The effects of high–energy resummation are found to be negligible at Tevatron,
while they enhance the cross section by a few percent for pT < 10 GeV at the LHC. Our

results imply that the discrepancy at small pT between fixed order NLO and Tevatron
data cannot be explained by unresummed high–energy contributions.
http://hdl.handle.net/10993/9074
10.1016/j.physletb.2010.08.063
http://dx.doi.org/10.1016/j.physletb.2010.08.063

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