Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-02-01
Phys.Rev.D76:013008,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 11 figures; published version
Scientific paper
10.1103/PhysRevD.76.013008
We compute the contributions to continuum photon pair production at hadron colliders from processes initiated by gluon-gluon and gluon-quark scattering into two photons through a four-leg virtual quark loop. Complete two-loop cross sections in perturbative quantum chromodynamics are combined with contributions from soft parton radiation resummed to all orders in the strong coupling strength. The structure of the resummed cross section is examined in detail, including a new type of unintegrated parton distribution function affecting azimuthal angle distributions of photons in the pair's rest frame. As a result of this analysis, we predict diphoton transverse momentum distributions in gluon-gluon scattering in wide ranges of kinematic parameters at the Fermilab Tevatron collider and the CERN Large Hadron Collider.
Balazs Csaba
Berger Edmond L.
Nadolsky Pavel
Yuan C.--P.
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