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Low-energy Compton scattering and the polarizabilities of the proton |
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| Authors: | V Olmos de León F Wissmann P Achenbach J Ahrens H-J Arends R Beck PD Harty V Hejny P Jennewein M Kotulla B Krusche V Kuhr R Leukel JC McGeorge V Metag R Novotny A Polonski F Rambo A Schmidt M Schumacher U Siodlaczek H Ströher A Thomas J Weiß M Wolf |
| Institution: | Institut für Kernphysik, Johannes Gutenberg Universit?t, D-55099 Mainz, Germany, DE |
| Abstract: | Differential cross-sections for Compton scattering from the proton have been measured at the MAMI tagged photon facility using the TAPS setup. The data cover an angular range of θlab γ = 59°-155° 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±0.5stat.±1.3syst.±0.3mod.] . 10-4 fm 3 and = 1.2±0.7stat.±0.3syst.±0.4mod.)] . 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 γπ beyond the t-channel π0-exchange. Received: 9 January 2001 / Accepted: 13 February 2001 |
| Keywords: | PACS 11 55 Fv Dispersion relation – 13 60 Fz Elastic and Compton scattering – 14 20 Dh Proton and neutrons – 25 20 Dc Photon absorption and scattering |
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