Test of low-energy theorems for H-1(gamma over-right-arrow,pi(0))H-1 in the threshold region - art. no. 232501

Citation
A. Schmidt et al., Test of low-energy theorems for H-1(gamma over-right-arrow,pi(0))H-1 in the threshold region - art. no. 232501, PHYS REV L, 8723(23), 2001, pp. 2501
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
8723
Issue
23
Year of publication
2001
Database
ISI
SICI code
0031-9007(200112)8723:23<2501:TOLTFH>2.0.ZU;2-6
Abstract
The photon asymmetry in the reaction H-1(<(<gamma>)over right arrow>, pi (0 ))H-1 close to threshold has been measured for the first time with the phot on spectrometer TAPS using linearly polarized photons from the tagged-photo n facility at the Mainz Microtron MAMI. The total and differential cross se ctions were also measured simultaneously with the photon asymmetry. This al lowed determination of the S-wave and all three P-wave amplitudes. The valu es obtained at threshold are E0+ = [-1.33 +/- 0.08(stat) +/- 0.03(syst)] x 10(-3)/m(pi+), P-1 = [9.47 +/- 0.08(stat) +/- 0.29(syst)] x 10(-3)q /m(pi+) (2) P-2 [-9.46 +/- 0.1(stat) +/- 0.29(syst)] x 10(-3)q/m(pi+)(2), and P-3 = [11.48 +/- 0.06(stat) +/- 0.35(syst)] x 10(-3)q/m(pi+)(2).