Measurement of the Helicity Difference in {gamma}{sup {yields}p{yields}{yields}p{pi}+{pi}-} with the CLAS Spectrometer at Jefferson Laboratory

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

DOI:https://doi.org/10.1063/1.3483405· OSTI ID:21426468

Park, Sungkyun ^[1]

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

The study of the properties of baryon resonances can provide us with hints to help us understand the structure of non-perturbative QCD and the effect of a particular resonance on polarization observables. The investigation of double-pion photoproduction data is needed to discover higher-lying states and their properties at and above W {approx_equal} 1.8 GeV. Therefore, the analysis of the helicity difference in gp {gamma}p{yields}p{pi}{sup +{pi}-} will help us in our understanding of QCD.The CLAS g9a (FROST) experiment, as part of the N* spectroscopy program at Jefferson Laboratory, has accumulated photoproduction data using linearly and circularly polarized photons incident on a longitudinally-polarized butanol target in the photon energy range 0.3 to 2.4 GeV. The FROST experiment provides an important step toward a ''complete'' experiment for the reaction {gamma}N{yields}KY.In this contribution, the method to calculate the helicity difference for the reaction {gamma}p{yields}p{pi}{sup +{pi}-} will be described and preliminary results will be discussed.

• OSTI ID: 21426468
• Journal Information: AIP Conference Proceedings, Vol. 1257, Issue 1; Conference: HADRON 2009: 13. international conference on hadron spectroscopy, Tallahassee, FL (United States), 29 Nov - 4 Dec 2009; Other Information: DOI: 10.1063/1.3483405; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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