TH Meeting on Particle Physics Phenomenology

Joint resummations

Name: Joint resummations
Start: 2001-07-27T14:00:00+02:00
End: 2001-07-27T15:00:00+02:00
Location: CERN

by HsiangNan LI (Inst. of Physics, Academia Sinica, Taipei, Taiwan)

Friday 27 Jul 2001, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

TH Auditorium

CERN

Description

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. This joint 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. Its importance for understanding the p _T spectrum of direct photon production is emphasized.