Low-energy Compton scattering and the polarizabilities of the proton

de Leon, V. O. and Wissmann, F. and Achenbach, P. and Ahrens, J. and Arends, H. J. and Beck, R. and Harty, P. D. and Hejny, V. and Jennewein, P. and Kotulla, M. and Krusche, B. and Kuhr, V. and Leukel, R. and McGeorgc, J. C. and Metag, V. and Novotny, R. and Polonski, A. and Rambo, F. and Schmidt, A. and Schumacher, M. and Siodlaczek, U. and Stroher, H. and Thomas, A. and Weiss, J. and Wolf, M.. (2001) Low-energy Compton scattering and the polarizabilities of the proton. The European physical journal. A, Hadrons and nuclei, Vol. 10, H. 2. pp. 207-215.

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Official URL: http://edoc.unibas.ch/dok/A5261965

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Differential cross-sections for Compton scattering from the proton hal e been measured at the MAMI tagged photon facility using the TAPS setup. The data cover an angular range of theta (lab)(gamma) = 59 degrees -155 degrees and photon energies ranging from 55 MeV to 165 MeV. Our results are in good agreement with those from previous experiments, but yield higher precision. Using dispersion relations the proton polarizabilities have been determined to be = [11.9 +/- 0.5(stat.) -/+ 1.3(syst.) +/- 0.3(mod.)] (.) 10(-4) fm(3) and = [1.2 +/- 0.7(stat.) +/- 0.3(syst). +/- 0.4(mod.))] (.) 10(-4) fm(3). These results confirm the Baldin sum rule which was re-evaluated to be + = [13.8 +/- 0.4] 10(-4) fm(3). We can also conclude that there is no significant additional asymptotic contribution to the backward spin polarizability gamma (pi) beyond the t-channel pi (0)-exchange.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note: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 13:55

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