IR-Improved DGLAP Theory: Kernels, Parton Distributions, Reduced Cross Sections

Details IR-Improved DGLAP Theory: Kernels, Parton Distributions, Reduced Cross Sections IR-Improved DGLAP Theory: Kernels, Parton Distributions, Reduced Cross Sections

2007-07-23

arxiv.org/abs/0707.3424v2

Annals Phys.323:2147-2171,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 2 figures

Scientific paper

10.1016/j.aop.2007.11.010

It is shown that exact, amplitude-based resummation allows IR-improvement of the usual DGLAP theory. This results in a new set of kernels, parton distributions and attendant reduced cross sections, so that the QCD perturbative result for the respective hadron-hadron or lepton-hadron cross section is unchanged order-by-order in $\alpha_s$ at large squared-momentum transfers. We compare these new objects with their usual counter-parts and illustrate the effects of the IR-improvement in some phenomenological cases of interest with an eye toward precision applications in LHC physics scenarios.

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