Beam-helicity asymmetries in double-charged-pion photoproduction on the proton - INSPIRE

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Beam-helicity asymmetries in double-charged-pion photoproduction on the proton

CLAS

Collaboration

•

S. Strauch
(
- George Washington U. and
- South Carolina U.
)

Aug, 2005

6 pages

Published in:

Phys.Rev.Lett. 95 (2005) 162003

e-Print:

hep-ex/0508002 [hep-ex]

DOI:

10.1103/PhysRevLett.95.162003

Report number:

JLAB-PHY-05-322

Experiments:

JLAB-E-89-004

View in:

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Abstract:

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 models currently do not provide an adequate description for the behavior of this new observable.

13.88.+e
13.60.Le
photon-proton interactions
pion production
meson photoproduction
polarisation in elementary particle interactions
photon p: exclusive reaction
photon: polarized beam
pi: photoproduction
pi: pair production

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Figures(0)

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