The CLAS Excited Baryon Program at JLab

Journal Article · Fri Oct 26 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2813878· OSTI ID:21036101

Crede, Volker ^[1]

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1. Florida State University, Tallahassee, FL 32306 (United States)

Nucleons are complex systems of confined quarks and exhibit characteristic spectra of excited states. Highly excited nucleon states are sensitive to details of quark confinement which is poorly understood within Quantum Chromodynamics (QCD), the fundamental theory of strong interactions. Thus, measurements of excited states and the corresponding determination of their properties are needed to come to a better understanding of how confinement works in nucleons. However, the excited states of the nucleon cannot simply be inferred from cleanly separated spectral lines. Quite the contrary, a spectral analysis in nucleon resonance physics is challenging because of the fact that the resonances are broadly overlapping states which decay into a multitude of final states involving mesons and baryons. To provide a consistent and complete picture of an individual nucleon resonance, the various possible production and decay channels must be treated in a multichannel framework that permits separating resonance from background contributions. Very often, resonances reveal themselves more clearly through interference with dominant amplitudes. These interference terms can be isolated via polarization observables. The current CLAS effort is to utilize highly-polarized hydrogen and deuterium targets as well as polarized photon beams toward a complete measurement of a large number of reaction channels.

• OSTI ID: 21036101
• Journal Information: AIP Conference Proceedings, Vol. 947, Issue 1; Conference: 7. Latin American symposium on nuclear physics and applications, Cusco (Peru), 11-16 Jun 2007; Other Information: DOI: 10.1063/1.2813878; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
BAG MODEL
CEBAF ACCELERATOR
DEUTERIUM TARGET
EXCITED STATES
HYDROGEN 1 TARGET
INTERFERENCE
MULTIPARTICLE SPECTROMETERS
NUCLEONS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PHOTON BEAMS
PHOTOPRODUCTION
POLARIZATION
POLARIZED TARGETS
QUANTUM CHROMODYNAMICS
QUARKS
RESONANCE PARTICLES
STRONG INTERACTIONS