Renormalization group approach to soft gluon resummation

Details Renormalization group approach to soft gluon resummation Renormalization group approach to soft gluon resummation

2002-09-13

arxiv.org/abs/hep-ph/0209154v2

Nucl.Phys. B650 (2003) 229-270

Physics

High Energy Physics

High Energy Physics - Phenomenology

37 pages, LaTeX

Scientific paper

10.1016/S0550-3213(02)01034-9

We present a simple proof of the all-order exponentiation of soft logarithmic corrections to hard processes in perturbative QCD. Our argument is based on proving that all large logs in the soft limit can be expressed in terms of a single dimensionful variable, and then using the renormalization group to resum them. Beyond the next-to-leading log level, our result is somewhat less predictive than previous all-order resummation formulae, but it does not rely on non-standard factorization, and it is thus possibly more general. We use our result to settle issues of convergence of the resummed series, we discuss scheme dependence at the resummed level, and we provide explicit resummed expressions in various factorization schemes.

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