DOI 10.1007/s100529900124
Pionic parton distributions revisited
M. Glück - E. Reya - I. Schienbein
Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany
Received: 3 March 1999 / Revised version: 3 May 1999 / Published online: 15 July 1999
Abstract
Using constituent quark model constraints we calculate the gluon and
sea-quark content of pions solely in terms of their valence density
(fixed by 
Drell-Yan data) and the known sea and gluon distributions
of the nucleon, using the most recent updated valence-like input parton
densities of the nucleon. The resulting small-x dynamical QCD
predictions for 
and 
are unique
and parameter free. Simple analytic parametrizations of the resulting
parton distributions of the pion are presented in LO and NLO. These
results and parametrizations will be important, among other things,
for updated formulations of the parton distributions of real and virtual
photons.
Copyright Springer-Verlag
