Helicity dependence of gamma p --> N pi below 450-MeV and contribution to the Gerasimov-Drell-Hearn sum rule - INSPIRE

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Helicity dependence of gamma p --> N pi below 450-MeV and contribution to the Gerasimov-Drell-Hearn sum rule

GDH and
A2

Collaborations

•

J. Ahrens
(
- Mainz U.
)

2000

5 pages

Published in:

Phys.Rev.Lett. 84 (2000) 5950-5954

DOI:

10.1103/PhysRevLett.84.5950

Experiments:

View in:

reference search117 citations

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Abstract: (APS)

The helicity dependence of the single pion photoproduction on the proton has been measured in the energy range from 200 to 450 MeV for the first time. The experiment, performed at the Mainz microtron MAMI, used a 4π-detector system, a circularly polarized, tagged photon beam, and a frozen-spin target. The data obtained provide new information for multipole analyses of pion photoproduction and determine the main contributions to the Gerasimov-Drell-Hearn sum rule and the forward spin polarizability γ0.

photon p: inelastic scattering
photon: tagged beam
photon: polarized beam
p: polarized target
pi: photoproduction
helicity: dependence
amplitude analysis: multipole
sum rule
channel cross section: energy dependence
channel cross section: helicity

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Figures(0)

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