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Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q2=0.92 and 1.76 GeV2 |
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| Authors: | Laveissière G Todor L Degrande N Jaminion S Jutier C Di Salvo R Van Hoorebeke L Alexa L C Anderson B D Aniol K A Arundell K Audit G Auerbach L Baker F T Baylac M Berthot J Bertin P Y Bertozzi W Bimbot L Boeglin W U Brash E J Breton V Breuer H Burtin E Calarco J R Cardman L S Cavata C Chang C-C Chen J-P Chudakov E Cisbani E Dale D S de Jager C W De Leo R Deur A d'Hose N Dodge G E Domingo J J Elouadrhiri L Epstein M B Ewell L A Finn J M Fissum K G Fonvieille H Fournier G Frois B Frullani S Furget C Gao H Gao J Garibaldi F Gasparian A Gilad S Gilman R Glamazdin A Glashausser C Gomez J Gorbenko V |
| Affiliation: | Université Blaise Pascal/IN2P3, F-63177 Aubière, France. |
| Abstract: | We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P(LL)-P(TT)/epsilon and P(LT), and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q2) and beta(M)(Q2) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from piN intermediate states. |
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