Nuclear Quark and Gluon Distributions in Coordinate Space

Details Nuclear Quark and Gluon Distributions in Coordinate Space Nuclear Quark and Gluon Distributions in Coordinate Space

1998-08-14

arxiv.org/abs/hep-ph/9808330v1

Eur.Phys.J. A3 (1998) 351-359

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages; Latex and Postscript files

Scientific paper

10.1007/s100500050189

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 $l \lsim 1$ 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.

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