Test of low-energy theorems for H-1(gamma over-right- arrow,pi(0))H-1 in the threshold region

Schmidt, A. et al. (2001) Test of low-energy theorems for H-1(gamma over-right- arrow,pi(0))H-1 in the threshold region. Physical Review Letters, 8723(23), art 232501. (doi: 10.1103/PhysRevLett.87.232501)

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 photon spectrometer TAPS using linearly polarized photons from the tagged-photon facility at the Mainz Microtron MAMI. The total and differential cross sections were also measured simultaneously with the photon asymmetry. This allowed determination of the S-wave and all three P-wave amplitudes. The values 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).

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: MacGregor, Professor Douglas
• Authors: Schmidt, A., Achenbach, P., Ahrens, J., Arends, H.J., Beck, R., Bernstein, A.M., Hejny, V., Kotulla, M., Krusche, B., Kuhr, V., Leukel, R., MacGregor, I.J.D., McGeorge, J.C., Metag, V., de Leon, V.M.O., Rambo, F., Siodlaczek, U., Stroher, H., Walcher, T., Weiss, J., Wissmann, F., and Wolf, M.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114