Author: Hall Crannell

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AUTHOR

Hall Crannell

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Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton

2005

Beam-helicity asymmetries for the two-pion-photoproduction reaction gamma + p --> p pi+ pi- have been studied for the first time in the resonance region for center-of-mass energies between 1.35 GeV and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an unpolarized hydrogen target. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics and dynamics of the reaction. The data are compared with the results of various phenomenological model calculations, and show that these…

Particle physicsPhotonProtonGeneral Physics and AstronomyFOS: Physical sciences13.60.-r 13.60.Le 13.88.+e[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)Pion0103 physical sciencesPhenomenological model[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentNuclear ExperimentPhysics010308 nuclear & particles physicsBremsstrahlungHelicity3. Good healthPair productionNucleon

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