Helicity asymmetries in the vec gammap → pπ+π− reaction
2005
Beam-helicity asymmetries in the p → pπ+π− reaction have been measured at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an unpolarized hydrogen target. The experiment covered the resonance region for center-of-mass energies between 1.35 GeV and 2.30 GeV. Here, we show a few examples out of the comprehensive data set and demonstrate the sensitivity of the helicity asymmetries to the dynamics of the reaction by comparing with the results of various phenomenological model calculations.
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