High-energy resummation in direct photon production
نویسندگان
چکیده
منابع مشابه
High-energy resummation in direct photon production
We present the computation of the direct photon production cross-section in perturbative QCD to all orders in the limit of high partonic center-of-mass energy. We show how the high-energy resummation can be performed consistently in the presence of a collinear singularity in the final state, we compare our results to the fixed order NLO cross-section in MS scheme, and we provide predictions at ...
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The resummation of threshold logarithms for direct photon production cross sections in hadronic collisions is presented. The resummation is based on the factorization properties of the cross section and is formulated at next-to-leading logarithmic or higher accuracy. Full analytical and numerical results for the next-to-next-toleading order expansion of the resummed cross section are given. A s...
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We present the explicit expressions for the resummation of large-xT Sudakov effects in the transverse-energy distribution of prompt-photons produced in hadronic collisions, to next-to-leading logarithmic (NLL) accuracy. Fragmentation processes do not contribute to the Sudakov resummation at NLL level. In Mellin space, the resummed radiative factor is the product of independent radiators for eac...
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The production rate and kinematic distributions of isolated photon pairs produced in hadron interactions are studied. The effects of the initial–state multiple soft–gluon emission to the scattering subprocesses qq̄, qg, and gg → γγX are resummed with the Collins–Soper–Sterman soft gluon resummation formalism. The effects of fragmentation photons from qg → γq, followed by q → γX, are also studied...
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We prove the all-order exponentiation of soft logarithmic corrections to prompt photon production in hadronic collisions, by generalizing an approach previously developed in the context of Drell-Yan production and deep-inelastic scattering. We show that all large logs in the soft limit can be expressed in terms of two dimensionful variables, and we use the renormalization group to resum them. T...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2010
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2009.09.001