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Test of low-energy theorems for ¹H(γ⃗,π0)¹H in the threshold region

Schmidt, A. and Achenbach, P. and Ahrens, J. and Arends, H. J. and Beck, R. and Bernstein, A. M. and Hejny, V. and Kotulla, M. and Krusche, B. and Kuhr, V. and Leukel, R. and MacGregor, I. J. D. and McGeorge, J. C. and Metag, V. and de Leon, V. M. O. and Rambo, F. and Siodlaczek, U. and Stroher, H. and Walcher, T. and Weiss, J. and Wissmann, F. and Wolf, M.. (2001) Test of low-energy theorems for ¹H(γ⃗,π0)¹H in the threshold region. Physical review letters, Vol. 87, H. 23 , 232501, 4 S..

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Official URL: http://edoc.unibas.ch/dok/A5261960

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Abstract

The photon asymmetry in the reaction H-1(, 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).
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0031-9007
Note:Variant title: Test of low-energy theorems for H-1(gamma over-right-arrow,pi(0))H-1 in the threshold region -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:53

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