Q2 dependence of quadrupole strength in the γ*p → Δ+(1232) → pπ0 transition

K. Joo, L. C. Smith, V. D. Burkert, R. Minehart, I. G. Aznauryan, L. Elouadrhiri, S. Stepanyan, G. S. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, D. S. Armstrong, B. Asavapibhop, G. Audit, T. Auger, H. Avakian, S. Barrow, H. Bagdasaryan, M. Battaglieri, K. BeardM. Bektasoglu, W. Bertozzi, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, W. K. Brooks, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. Cummings, E. de Sanctis, R. de Vita, P. V. Degtyarenko, R. A. Demirchyan, H. Denizli, L. C. Dennis, A. Deppman, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, Michael Dugger, S. Dytman, M. Eckhause, Y. V. Efremenko, H. Egiyan, K. S. Egiyan, L. Farhi, R. J. Feuerbach, J. Ficenec, K. Fissum, T. A. Forest, H. Funsten, M. Gai, V. B. Gavrilov, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, K. A. Griffioen, M. Guidal, M. Guillo, V. Gyurjyan, D. Hancock, J. Hardie, D. Heddle, J. Heisenberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, J. H. Kelley, M. Khandaker, K. Y. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, Y. Kuang, S. E. Kuhn, J. M. Laget, D. Lawrence, A. Longhi, K. Loukachine, M. Lucas, R. W. Major, J. J. Manak, C. Marchand, S. K. Matthews, S. McAleer, J. W C McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, M. Mirazita, R. Miskimen, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, G. Niculescu, B. Niczyporuk, R. A. Niyazov, M. S. Ohandjanyan, A. Opper, Y. Patois, G. A. Peterson, S. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, C. W. Salgado, M. Sanzone, V. Sapunenko, M. Sargsyan, R. A. Schumacher, Y. G. Sharabian, J. Shaw, S. M. Shuvalov, A. Skabelin, E. S. Smith, T. Smith, D. I. Sober, M. Spraker, P. Stoler, M. Taiuti, S. Taylor, D. Tedeschi, R. Thompson, L. Todor, T. Y. Tung, M. F. Vineyard, A. Vlassov, H. Weller, L. B. Weinstein, R. Welsh, D. P. Weygand, S. Whisnant, M. Witkowski, E. Wolin, A. Yegneswaran, J. Yun, Z. Zhou, J. Zhao

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206 Scopus citations

Abstract

The dependence of quadrupole strength in the γ*p → δ+ (1232) → pπ0 transition was discussed. Experimental values for the ratios E1+/M1+ and S1+/M1+ over the range Q2 = 0.4-1.8 GeV2, were extracted from precision p(e, e'p)π0 data using a truncated multipole expansion. It was found that the typical (worst) absolute truncation error (including model dependence) was 0.3(0.7)% for REM and 0.1(0.5)% for RSM over the Q2 range of this experiment, with the error generally increasing with Q2 due to the larger relative importance of neglected nonresonant multipoles.

Original languageEnglish (US)
Article number122001
Pages (from-to)1220011-1220015
Number of pages5
JournalPhysical Review Letters
Volume88
Issue number12
StatePublished - Mar 25 2002

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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