Eur. Phys. J. A 14, 105-112 (2002)
DOI: 10.1140/epja/iepja1323

Quark-hadron duality and the nuclear EMC effect

W. Melnitchouk¹, K. Tsushima² and A.W. Thomas<sup>2

1</sup>  Jefferson Lab, 12000 Jefferson Avenue, Newport News, VA 23606, USA
²  Special Research Centre for the Subatomic Structure of Matter, and Department of Physics and Mathematical Physics, Adelaide University, 5005, Australia

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(Received: 26 October 2001 / Revised version: 12 January 2002 Communicated by V. Vento)

Abstract
Recent data on polarized proton knockout reactions off ⁴He nuclei suggest a small but nonzero modification of proton electromagnetic form factors in medium. Using model-independent relations derived on the basis of quark-hadron duality, we relate the medium modification of the form factors to the modification at large x of the deep-inelastic structure function of a bound proton. This places strong constraints on models of the nuclear EMC effect which assume a large deformation of the intrinsic structure of the nucleon in medium.

PACS
13.60.Hb - Total and inclusive cross-sections (including deep-inelastic processes).
13.40.Gp - Electromagnetic form factors.
14.20.Dh - Protons and neutrons.

© Società Italiana di Fisica, Springer-Verlag 2002