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. BoeglinE. 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. le Rose, 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, 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

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Abstract

The generalized polarizabilities (GP) of proton at low c.m. energies were investigated in virtual Compton scattering (VCS). At momentum transfer Q 2 = 0.92 and 1.76 GeV2, the structure functions and the electric and magnetic GP were determined. The global behavior of electric GP did not follow a simple dipole form and indicated a strong falloff with Q 2. A paramagnetic contribution from πN intermediate states at higher Q2 compensated the dominance of a long-distance diamagnetic pion cloud at low Q2.

Original languageEnglish (US)
Article number122001
Pages (from-to)122001-1-122001-5
JournalPhysical Review Letters
Volume93
Issue number12
DOIs
StatePublished - Sep 17 2004

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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., ... Zhou, Z. L. (2004). Measurement of the generalized polarizabilities of the proton in virtual compton scattering at Q2 = 0.92 and 1.76 GeV2. Physical Review Letters, 93(12), 122001-1-122001-5. [122001]. https://doi.org/10.1103/PhysRevLett.93.122001