Measurement of the N +(1232) transition at high-momentum transfer by 0 electroproduction

M. Ungaro, P. Stoler, I. Aznauryan, V. D. Burkert, K. Joo, L. C. Smith, G. Adams, M. Amarian, P. Ambrozewicz, M. Anghinolfi, G. Asryan, G. Audit, H. Avakian, H. Bagdasaryan, J. P. Ball, N. A. Baltzell, S. Barrow, V. Batourine, M. Battaglieri, I. BedliskiM. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, A. Cazes, S. Chen, P. L. Cole, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, J. P. Cummings, E. de Sanctis, R. DeVita, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, Michael Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, P. Eugenio, R. Fatemi, G. Fedotov, G. Feldman, R. J. Feuerbach, H. Funsten, M. Garçon, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. Goetz, C. I O Gordon, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, I. Hleiqawi, M. Holtrop, K. Hicks, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, M. M. Ito, D. Jenkins, H. S. Jo, H. G. Juengst, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Kossov, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, J. Li, K. Livingston, C. Marchand, N. Markov, S. McAleer, B. McKinnon, J. W C McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. Niroula, R. A. Niyazov, M. Nozar, G. V. O'Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, G. Rosner, P. Rossi, P. D. Rubin, F. Sabatié, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, A. V. Skabelin, E. S. Smith, D. I. Sober, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, U. Thoma, A. Tkabladze, L. Todor, S. Tkachenko, C. Tur, M. F. Vineyard, A. V. Vlassov, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, B. Zhang, J. Zhang, B. Zhao

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Abstract

We report a new measurement of the exclusive electroproduction reaction 0p to explore the evolution from soft nonperturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the N transition. 9000 differential cross section data points cover W from threshold to 1.4GeV/c2, 4 center-of-mass solid angle, and Q2 from 3 to 6GeV2/c2, the highest yet achieved. It is found that the magnetic form factor GM* decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating strong helicity nonconservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.

Original languageEnglish (US)
Article number112003
JournalPhysical Review Letters
Volume97
Issue number11
DOIs
StatePublished - Sep 21 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ungaro, M., Stoler, P., Aznauryan, I., Burkert, V. D., Joo, K., Smith, L. C., Adams, G., Amarian, M., Ambrozewicz, P., Anghinolfi, M., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Ball, J. P., Baltzell, N. A., Barrow, S., Batourine, V., Battaglieri, M., ... Zhao, B. (2006). Measurement of the N +(1232) transition at high-momentum transfer by 0 electroproduction. Physical Review Letters, 97(11), [112003]. https://doi.org/10.1103/PhysRevLett.97.112003