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Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of $Q^2$ = 1.0 $GeV^2$

G. Laveissiere 1 N. Degrande S. Jaminion 1 C. Jutier 1 L. Todor 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 J. Berthot 1 P.Y. Bertin 1 W. Bertozzi L. Bimbot 2 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 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. Kamalov 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. Marchand D. Marchand D.J. Margaziotis P. Markowitz J. Marroncle J. Martino 3 C.J. Martoff 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 C.F. Perdrisat R. Perrino G.G. Petratos S. Platchkov R. Pomatsalyuk D.L. Prout V.A. Punjabi T. Pussieux G. Quéméner R.D. Ransome O. Ravel 1 J.S. Real 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 L. Tiator R. Tieulent 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 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 have made the first measurements of the virtual Compton scattering process via the e p -> e p gamma exclusive reaction at Q**2 = 1 GeV**2 in the nucleon resonance region. The cross section is obtained at center of mass (CM) backward angle, theta_gamma_gamma*, in a range of total (gamma* p) CM energy W from the proton mass up to W = 1.91 GeV. The data show resonant structures in the first and second resonance regions, and are well reproduced at higher W by the Bethe-Heitler+Born cross section, including t-channel pi0-exchange. At high W, our data, together with existing real photon data, show a striking Q**2 independence. Our measurement of the ratio of H(e,e'p)gamma to H(e,e'p)pi0 cross sections is presented and compared to model predictions.
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Submitted on : Wednesday, May 5, 2004 - 4:25:23 PM
Last modification on : Friday, November 13, 2020 - 3:20:08 PM

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G. Laveissiere, N. Degrande, S. Jaminion, C. Jutier, L. Todor, et al.. Virtual compton scattering in the resonance region up to the deep inelastic region at backward angles and momentum transfer squared of $Q^2$ = 1.0 $GeV^2$. Physical Review C, American Physical Society, 2009, 79, pp.015201. ⟨10.1103/PhysRevC.79.015201⟩. ⟨in2p3-00021754⟩

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