Highlights in light-baryon spectroscopy and searches for gluonic excitations

Journal Article · Fri Jan 22 00:00:00 EST 2016 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4938596· OSTI ID:22499013

Crede, Volker ^[1]

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

The spectrum of excited hadrons - mesons and baryons - serves as an excellent probe of quantum chromodynamics (QCD), the fundamental theory of the strong interaction. The strong coupling however makes QCD challenging. It confines quarks and breaks chiral symmetry, thus providing us with the world of light hadrons. Highly-excited hadronic states are sensitive to the details of quark confinement, which is only poorly understood within QCD. This is the regime of non-perturbative QCD and it is one of the key issues in hadronic physics to identify the corresponding internal degrees of freedom and how they relate to strong coupling QCD. The quark model suggests mesons are made of a constituent quark and an antiquark and baryons consist of three such quarks. QCD predicts other forms of matter. What is the role of glue? Resonances with large gluonic components are predicted as bound states by QCD. The lightest hybrid mesons with exotic quantum numbers are estimated to have masses in the range from 1 to 2 GeV/c{sup 2} and are well in reach of current experimental programs. At Jefferson Laboratory (JLab) and other facilities worldwide, the high-energy electron and photon beams present a remarkably clean probe of hadronic matter, providing an excellent microscope for examining atomic nuclei and the strong nuclear force.

• OSTI ID: 22499013
• Journal Information: AIP Conference Proceedings, Vol. 1701, Issue 1; Conference: 11. conference on quark confinement and hadron spectrum, Saint Petersburg (Russian Federation), 8-12 Sep 2014; Other Information: (c) 2016 AIP Publishing LLC; 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
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTIQUARKS
BAG MODEL
BARYON SPECTROSCOPY
BARYONS
BOUND STATE
CEBAF ACCELERATOR
CHIRAL SYMMETRY
ELECTRONS
EXCITATION
GEV RANGE 01-10
MESONS
NUCLEAR FORCES
QUANTUM CHROMODYNAMICS
QUANTUM NUMBERS
STRONG INTERACTIONS
STRONG-COUPLING MODEL