CLAS: DOUBLE-PION BEAM ASYMMETRY
CLAS: DOUBLE-PION BEAM ASYMMETRY
Beam-helicity asymmetries for the gamma+p -> pi+ + pi- + p reaction have been measured for center-of-mass energies between 1.35 GeV and 2.30 GeV at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons. The beam-helicity asymmetries vary with kinematics and exhibit strong sensitivity to the dynamics of the reaction, as demonstrated in the comparison of the data with results of various phenomenological model calculations. These models currently do not provide an adequate description of the data over the entire kinematic range covered in this experiment. Additional polarization observables are accessible in an upcoming experiment at Jefferson Lab with polarized beam and target.
10 pages, 8 Figures, Proc. Int. Workshop NSTAR 2005 at Tallahassee, FL, October 2005
- University of South Carolina United States
- University of South Carolina System United States
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
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