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

Citation
J. Ahrens et al., Helicity dependence of gamma p -> N pi below 450 MeV and contribution to the Gerasimov-Drell-Hearn sum rule, PHYS REV L, 84(26), 2000, pp. 5950-5954
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
84
Issue
26
Year of publication
2000
Pages
5950 - 5954
Database
ISI
SICI code
0031-9007(20000626)84:26<5950:HDOGP->2.0.ZU;2-5
Abstract
The helicity dependence of the single pion photoproduction on the proton ha s 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 4 pi-detecto r system, a circularly polarized, tagged photon beam, and a frozen-spin tar get. The data obtained provide new information for multipole analyses of pi on photoproduction and determine the main contributions to the Gerasimov-Dr ell-Hearn sum rule and the forward spin polarizability gamma(0).