By Carl Carlson
An exploration of advancements within the region of three-quark structures. Emphasis is given to the dialogue of experimental leads to the parts of shape elements, unpolarized and polarized constitution services, and baryon constitution and spectroscopy. Of specific curiosity are the theoretical advancements within the sector of generalized parton distributions and lattice quantum chromodynamics. The papers are taken from the 9th overseas convention at the constitution of Baryons, held in Newport information, Virginia in 2002.
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Extra resources for Baryons, 2002
C 60,068201 (1999). 50. A. W. , nucl-th/9807027. 51. S. Strauch, contribution to this conference. 16 Danielle Morel and Simon Capstick Gerrit Schierholz and Christine Davies BARYON SPECTROSCOPY IN THE QUARK MODEL S. edu The basis of constituent quark models of the baryon spectrum is reviewed, with a description of the effective degrees of freedom, their confinement, and various models of their short-distance interactions. It is argued that such models should not be compared with the results of analyses of hadron scattering data without considering the effects of quark-antiquark pairs on the spectrum, and a model of such effects is described.
The predictions of such models for this richer spectrum are testable in experiments designed to find new baryon states. Baryons can also be described as current quarks moving in a confining bag, with pions coupled to the surface in the cloudy 17 18 bag model5. Although this description has several advantages, it is difficult to describe non-spherical excited states in this framework, and so its application has largely been limited to ground states. 2 Constituent Quarks Constituent quarks have dynamically generated masses, which run with Q’.
Geiger and N. Isgur, Phys. Rev. Lett. 67,1066 (1991). 24. M. A. Pichowsky, S. Walawalkar and S. Capstick, Phys. Rev. D 60, 054030 (1999). 25. Danielle Morel, Florida State University PhD thesis, and in these proceedings. ELECTROEXCITATION OF NUCLEON RESONANCES VOLKER D. BURKERT Jefferson Lab, 12000 Jefferson Avenue, Newport News, VA23606 Recent elcctroproductiori results in the domain of schaniiel nucleon rcsoriaricc excitation arc prcsentcd. and preliminary data in the search for missing states will be discussed.