Soft-Gluon Resummation and the Valence Parton Distribution Function of the Pion

Journal Article · Fri Dec 17 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.252003· OSTI ID:21554478

Aicher, Matthias; Schaefer, Andreas ^[1]; Vogelsang, Werner ^[2]

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1. Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg (Germany)
2. Institute for Theoretical Physics, Universitaet Tuebingen, Auf der Morgenstelle 14, D-72076 Tuebingen (Germany)

We determine the valence parton distribution function of the pion by performing a new analysis of data for the Drell-Yan process {pi}{sup -}N{yields}{mu}{sup +}{mu}{sup -}X. Compared to previous analyses, we include next-to-leading-logarithmic threshold resummation effects in the calculation of the Drell-Yan cross section. As a result of these, we find a considerably softer valence distribution at high momentum fractions x than obtained in previous next-to-leading-order analyses, in line with expectations based on perturbative-QCD counting rules or Dyson-Schwinger equations.

• OSTI ID: 21554478
• Journal Information: Physical Review Letters, Vol. 105, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.105.252003; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
DATA ANALYSIS
DISTRIBUTION
DISTRIBUTION FUNCTIONS
DRELL MODEL
GLUONS
MUONS MINUS
PIONS MINUS
QUANTUM CHROMODYNAMICS
VALENCE
BOSONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FUNCTIONS
HADRONS
LEPTONS
MESONS
MUONS
PIONS
PSEUDOSCALAR MESONS
QUANTUM FIELD THEORY