Test of low-energy theorems for 1H(--> gamma, pi(0))(H)in the threshold hegion.
作者信息
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, McGeorge J C, Metag V, Olmos De León V M, Rambo F, Siodlaczek U, Ströher H, Walcher T, Weiss J, Wissmann F, Wolf M
机构信息
Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany.
出版信息
Phys Rev Lett. 2001 Dec 3;87(23):232501. doi: 10.1103/PhysRevLett.87.232501. Epub 2001 Nov 15.
The photon asymmetry in the reaction 1H(--> gamma,pi(0))(1)H 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 E(0+) = [-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(2)(pi(+)), P(2) = [-9.46 +/- 0.1(stat) +/- 0.29(syst)] x 10(-3)q/m(2)(pi(+)), and P(3) = [11.48 +/- 0.06(stat) +/- 0.35(syst)] x 10(-3)q/m(2)(pi(+)).
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