Unification of the $k_T$ and threshold resummations

Details Unification of the $k_T$ and threshold resummations Unification of the $k_T$ and threshold resummations

1998-12-15

arxiv.org/abs/hep-ph/9812363v1

Phys.Lett. B454 (1999) 328-334

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages in latex, 1 figure in postscript

Scientific paper

10.1016/S0370-2693(99)00350-0

We derive a resummation formula for a $k_T$-dependent parton distribution function at threshold, where $k_T$ is a parton transverse momentum. The derivation requires infrared cutoffs for both longitudinal and transverse loop momenta as evaluating soft gluon emissions in the Collins-Soper resummation framework. This unified resummation exhibits suppression at large $b$, $b$ being the conjugate variable of $k_T$, which is similar to the $k_T$ resummation, and exhibits enhancement at small $b$, similar to the threshold resummation.

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