The Search for Exotic Mesons in {gamma}p{yields}{pi}{sup +{pi}+{pi}-}n with CLAS at Jefferson Lab

Journal Article · Thu Aug 05 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3483377· OSTI ID:21426440

Bookwalter, Craig ^[1]

---

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

In addition to ordinary qq-bar pairs, quantum chromodynamics (QCD) permits many other possibilities in meson spectra, such as gluonic hybrids, glueballs, and tetraquarks. Experimental discovery and study of these exotic states provides insight on the nonperturbative regime of QCD. Over the past twenty years, some searches for exotic mesons have met with controversial results, especially those obtained in the three-pion system. Prior theoretical work indicates that in photoproduction one should find gluonic hybrids at significantly enhanced levels compared to that found in pion production. To that end, the CLAS g12 run was recently completed at Jefferson Lab, using a liquid hydrogen target and tagged photons from a 5.71 GeV electron beam. The CLAS experimental apparatus was modified to maximize forward acceptance for peripheral production of mesons. The resulting data contains the world's largest 3{pi} photoproduction dataset, with {gamma}p{yields}{pi}{sup +{pi}+{pi}-}n events numbering in the millions. Early results describing the data quality, kinematics, and dysnamics will be shown.

• OSTI ID: 21426440
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1257; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYONS
BASIC INTERACTIONS
BOSONS
CEBAF ACCELERATOR
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
GLUEBALLS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
MESON SPECTROSCOPY
MESON-MESON INTERACTIONS
MESONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SPECTROMETERS
SPECTROSCOPY