Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Volume 22, Issue 6, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218301313300154
Keywords
Electromagnetic form-factors; baryon resonances; meson production; lattice QCD calculations; quark models; dispersion relations; nonperturbative QCD; confinement; dynamical chiral symmetry breaking; CLAS; Jefferson lab
Categories
Funding
- U.S. National Science Foundation [NSF-PHY-0856010, NSF-PHY-0903991, NSF-PHY-1206082]
- U.S. Department of Energy, Office of Nuclear Physics Division [DE-AC02-76SF00515, DE-AC02-06CH11357, DE-AC05-06OR23177]
- European Union [283286]
- Fundacao para a Ciencia e a Tecnologia [SFRH/BPD/26886/2006, PTDC/FIS/113940/2009]
- Programa de Cooperacion Bilateral Mexico-Estados Unidos CONACyT Project [46614-F]
- Coordinacion de la Investigacion Cientifica (CIC) Project [4.10]
- Forschungszentrum Julich GmbH
- University of Adelaide
- Australian Research Council [FL0992247]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2009/51296-1, 2010/05772-3]
- National Energy Research Scientific Computing Center
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205782] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0856010] Funding Source: National Science Foundation
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/113940/2009] Funding Source: FCT
Ask authors/readers for more resources
Studies of the structure of excited baryons are key factors to the N* program at Jefferson Lab (JLab). Within the first year of data taking with the Hall B CLAS12 detector following the 12 GeV upgrade, a dedicated experiment will aim to extract the N* electrocouplings at high photon virtualities Q(2). This experiment will allow exploration of the structure of N* resonances at the highest photon virtualities ever achieved, with a kinematic reach up to Q(2) = 12 GeV2. This high-Q(2) reach will make it possible to probe the excited nucleon structures at distance scales ranging from where effective degrees of freedom, such as constituent quarks, are dominant through the transition to where nearly massless bare-quark degrees of freedom are relevant. In this document, we present a detailed description of the physics that can be addressed through N* structure studies in exclusive meson electroproduction. The discussion includes recent advances in reaction theory for extracting N* electrocouplings from meson electroproduction off protons, along with Quantum Chromodynamics (QCD)-based approaches to the theoretical interpretation of these fundamental quantities. This program will afford access to the dynamics of the nonperturbative strong interaction responsible for resonance formation, and will be crucial in understanding the nature of confinement and dynamical chiral symmetry breaking in baryons, and how excited nucleons emerge from QCD.
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