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20 April 2024

» pubmed » pmid15447252

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Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q2=0.92 and 1.76 GeV2
G Laveissière ; L Todor ; N Degrande ; S Jaminion ; C Jutier ; R Di Salvo ; L Van Hoorebeke ; L C Alexa ; B D Anderson ; K A Aniol ; K Arundell ; G Audit ; L Auerbach ; F T Baker ; M Baylac ; J Berthot ; P Y Bertin ; W Bertozzi ; L Bimbot ; W U Boeglin ; E J Brash ; V Breton ; H Breuer ; E Burtin ; J R Calarco ; L S Cardman ; C Cavata ; C-C Chang ; J-P Chen ; E Chudakov ; E Cisbani ; D S Dale ; C W de Jager ; R De Leo ; A Deur ; N d’Hose ; G E Dodge ; J J Domingo ; L Elouadrhiri ; M B Epstein ; L A Ewell ; J M Finn ; K G Fissum ; H Fonvieille ; G Fournier ; B Frois ; S Frullani ; C Furget ; H Gao ; J Gao ; F Garibaldi ; A Gasparian ; S Gilad ; R Gilman ; A Glamazdin ; C Glashausser ; J Gomez ; V Gorbenko ; P Grenier ; P A M Guichon ; J O Hansen ; R Holmes ; M Holtrop ; C Howell ; G M Huber ; C E Hyde-Wright ; S Incerti ; M Iodice ; J Jardillier ; M K Jones ; W Kahl ; S Kato ; A T Katramatou ; J J Kelly ; S Kerhoas ; A Ketikyan ; M Khayat ; K Kino ; S Kox ; L H Kramer ; K S Kumar ; G Kumbartzki ; M Kuss ; A Leone ; J J LeRose ; M Liang ; R A Lindgren ; N Liyanage ; G J Lolos ; R W Lourie ; R Madey ; K Maeda ; S Malov ; D M Manley ; C March ; D March ; D J Margaziotis ; P Markowitz ; J Marroncle ; J Martino ; K McCormick ; J McIntyre ; S Mehrabyan ; F Merchez ; Z E Meziani ; R Michaels ; G W Miller ; J Y Mougey ; S K Nanda ; D Neyret ; E A J M Offermann ; Z Papandreou ; B Pasquini ; C F Perdrisat ; R Perrino ; G G Petratos ; S Platchkov ; R Pomatsalyuk ; D L Prout ; V A Punjabi ; T Pussieux ; G Quémenér ; R D Ransome ; O Ravel ; J S Real ; F Renard ; Y Roblin ; D Rowntree ; G Rutledge ; P M Rutt ; A Saha ; T Saito ; A J Sarty ; A Serdarevic ; T Smith ; G Smirnov ; K Soldi ; P Sorokin ; P A Souder ; R Suleiman ; J A Templon ; T Terasawa ; R Tieulent ; E Tomasi-Gustaffson ; H Tsubota ; H Ueno ; P E Ulmer ; G M Urciuoli ; M Vanderhaeghen ; R Van De Vyver ; R L J Van der Meer ; P Vernin ; B Vlahovic ; H Voskanyan ; E Voutier ; J W Watson ; L B Weinstein ; K Wijesooriya ; R Wilson ; B B Wojtsekhowski ; D G Zainea ; W-M Zhang ; J Zhao ; Z-L Zhou ; ;
Date:	17 Sep 2004
Journal:	Phys Rev Lett, 93 (12), 122001
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.
Source:	PubMed, pmid15447252
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