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Measurement of the generalized polarizabilities of the proton in virtual compton scattering at $Q^2$ = 0.92 and 1.76 Gev$^2$

G. Laveissiere 1 L. Todor N. Degrande S. Jaminion 1 C. Jutier 1 R. Di Salvo 1 L. van Hoorebeke L.C. Alexa B.D. Anderson K.A. Aniol K. Arundell G. Audit L. Auerbach F.T. Baker M. Baylac 2 J. Berthot 1 P.Y. Bertin 1 W. Bertozzi L. Bimbot 3 W.U. Boeglin E.J. Brash Vincent Breton 1 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 1 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 1 G. Fournier B. Frois S. Frullani C. Furget 4 H. Gao J. Gao F. Garibaldi A. Gasparian S. Gilad R. Gilman A. Glamazdin C. Glashausser J. Gomez V. Gorbenko P. Grenier 1 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 4 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. Marchand D. Marchand D.J. Margaziotis P. Markowitz J. Marroncle J. Martino 5 C.J. Martoff K. Mccormick J. Mcintyre S. Mehrabyan F. Merchez 4 Z.E. Meziani R. Michaels G.W. Miller J.Y. Mougey 4 S.K. Nanda D. Neyret E.A.J.M. Offermann Z. Papandreou C.F. Perdrisat R. Perrino G.G. Petratos S. Platchkov R. Pomatsalyuk D.L. Prout V.A. Punjabi T. Pussieux G. Quéméner 4 R.D. Ransome O. Ravel 1 J.S. Real 4 F. Renard Y. Roblin 1 D. Rowntree G. Rutledge P.M. Rutt A. Saha T. Saito A.J. Sarty A. Serdarevic T. Smith George Smirnov 1 K. Soldi P. Sorokin P.A. Souder R. Suleiman J.A. Templon T. Terasawa R. Tieulent 4 E. Tomasi-Gustaffson H. Tsubota H. Ueno P.E. Ulmer G.M. Urciuoli R. van de Vyver R.L.J. van der Meer P. Vernin B. Vlahovic H. Voskanyan E. Voutier 4 J.W. Watson L.B. Weinstein K. Wijesooriya R. Wilson B.B. Wojtsekhowski D.G. Zainea W.M. Zhang J. Zhao Z.L. Zhou
Abstract : We report a Virtual Compton Scattering study of the proton in Hall A at the Thomas Jefferson National Accelerator Facility at low CM energies. We have determined the structure functions $P_{LL}-P_{TT}/\epsilon$ and $P_{LT}$, and the electric and magnetic Generalized Polarizabilities (GP) $\alpha_E(Q2)$ and $\beta_M(Q2)$ at momentum transfer Q2= 0.92 and 1.76 GeV2. All these observables show a strong fall-off with Q2, and neither the electric nor magnetic GP follows a simple dipole form.
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Submitted on : Wednesday, December 1, 2004 - 9:03:08 AM
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G. Laveissiere, L. Todor, N. Degrande, S. Jaminion, C. Jutier, et al.. Measurement of the generalized polarizabilities of the proton in virtual compton scattering at $Q^2$ = 0.92 and 1.76 Gev$^2$. Physical Review Letters, American Physical Society, 2004, 93, 122001 (5 p.). ⟨10.1103/PhysRevLett.93.122001⟩. ⟨in2p3-00021750⟩

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