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Hadrons and Nuclei

EPJ A Highlight - Nuclear physics with a medium-energy Electron-Ion Collider

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Possible realizations of a medium-energy EIC: MEIC at Jefferson Lab (top) and eRHIC at Brookhaven National Lab (bottom)

Quarks and gluons are the fundamental constituents of most of the matter in the visible Universe; Quantum Chromodynamics (QCD), a relativistic quantum field theory based on color gauge symmetry, describes their strong interactions. The understanding of the static and dynamical properties of the visible strongly interacting particles - hadrons - in terms of quarks and gluons is one of the most fascinating issues in hadron physics and QCD. In particular the exploration of the internal structure of protons and neutrons is one of the outstanding questions in experimental and theoretical nuclear and hadron physics. Impressive progress has been achieved recently.

The paper, clearly and concisely, addresses several of the issues related to the microscopic structure of hadrons and nuclei: (i) the three–dimensional structure of the nucleon in QCD, which involves the spatial distributions of quark and gluons , their orbital motion, possible correlations between spin and intrinsic motion; (ii) the fundamental color fields in nuclei (nuclear parton densities, shadowing, coherence effects, color transparency); (iii) the conversion of color charge to hadrons (fragmentation, parton propagation through matter, in–medium jets).

The conceptual aspects of these questions are briefly reviewed and the measurements that would address them are discussed, with emphasis on the new information that could be obtained with experiments at an electron-ion collider collider (EIC). Such a medium–energy EIC could be realized at Jefferson Lab after the 12 GeV upgrade (MEIC), or at Brookhaven National Lab as the low–energy stage of eRHIC.

Nuclear physics with a medium-energy Electron-Ion Collider. A. Accardi, V. Guzey, A. Prokudin, C. Weiss, Eur. Phys. J. A (2012) 48:92

Editors-in-Chief
David Blaschke, Thomas Duguet and Maria Jose Garcia Borge
We are grateful to the referees for their very detailed review of our manuscript and for the important remarks and corrections. The referees are very nice experts of the subject of the paper. The manuscript has been revised with our pleasure. Thank you very much for the choice of the referees who were high level experts and kind scientists.

Avazbek Nasirov, Joint Institute for Nuclear Research, Moscow Region, Russian Federation

ISSN (Electronic Edition): 1434-601X

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