2022 Impact factor 4.4
Particles and Fields

Eur. Phys. J. C 21, 613-620 (2001)
DOI: 10.1007/s100520100771

Constraints for the nuclear sea quark distributions from the Drell-Yan process at the SPS

K.J. Eskola1, 2, V.J. Kolhinen1, C.A. Salgado3 and R.L. Thews4

1  Department of Physics, University of Jyväskylä, P.O. Box 35, 40351 Jyväskylä, Finland
2  Helsinki Institute of Physics, P.O. Box 9, 00014 University of Helsinki, Finland
3  Laboratoire de Physique Théorique (Laboratoire associé au Centre National de la Recherche Scientifique - URA D0063) , Université de Paris XI, Bâtiment 211, 91405 Orsay Cedex, France
4  Department of Physics, University of Arizona, Tucson, Arizona 85721, USA

(Received: 6 October 2000 / Revised version: 2 July 2001 / Published online: 19 September 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

Nuclear modifications to the Drell-Yan dilepton production cross sections in p+A and A+A collisions in the leading twist approximation are caused by nuclear effects in the parton distributions of bound nucleons. For non-isoscalar nuclei, isospin corrections must also be considered. We calculate these effects for p+A and Pb+Pb collisions at CERN SPS energies. Our goal is to place constraints on nuclear effects in sea quark distributions in the region $x\gtrsim0.2$. We show that the net nuclear corrections remain small for p+A collisions at Elab=450 GeV. However, in Pb+Pb collisions at E lab=158 AGeV, effects of $\gtrsim20\%$ are predicted at large M. The data collected by the NA50 collaboration could thus be used to constrain the nuclear effects in the sea quark distributions in the region of the EMC effect, $x\gtrsim0.3$.

© Società Italiana di Fisica, Springer-Verlag 2001