2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 3, 351-359

Work supported in part by BMBF

Nuclear quark and gluon distributions in coordinate space

M. Vänttinen1 - G. Piller1 - L. Mankiewicz1,2 - W. Weise1 - K.J. Eskola3

1 Physik Department, Technische Universität München, D-85747 Garching, Germany
2 N. Copernicus Astronomical Center, Polish Academy of Science, Warsaw
3 Department of Physics, University of Jyväskylä, P.O.Box 35, FIN-40351 Jyväskylä, Finland

Received: 17 August 1998 / Revised version: 25 September 1998 Communicated by A. Schäfer

Abstract
In coordinate space, quark and gluon distributions of the nucleon are defined as correlation functions involving two field operators separated by a light-cone distance y+ = 2l. We study the nuclear modifications of these distributions. The largest effect is a strong depletion of parton distributions (shadowing) at large longitudinal distances, which starts for all parton species at l=2 fm, i.e. at the average nucleon-nucleon separation in nuclei. On the other hand, the nuclear radius does not play a significant role. At $l \buildrel < \over {_\sim}1$ fm, nuclear modifications of parton distributions are small. The intrinsic structure of individual nucleons is evidently not very much affected by nuclear binding. In particular, there is no evidence for a significant increase of the quark or gluon correlation length in bound nucleons.

PACS
13.60.Hb Total and inclusive cross sections - 14.20.Dh Protons and neutrons - 24.85.+p Quarks, gluons, and QCD in nuclei and nuclear processes


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