Search for quadrupole strength in the electroexcitation of the Δ+ (1232)

Authors :: Mertz, C. Vellidis, C.E. Alarcon, R. Barkhuff, D.H. Bernstein, A.M. Bertozzi, W. Burkert, V. Chen, J. Comfort, J.R. Dodson, G. Dow, K. Farkhondeh, M. Finn, J.M. Gilad, S. Gothe, R.W. Jiang, X. Joo, K. Kaloskamis, N.I. Karabarbounis, A. Kelly, J.J. Kowalski, S. Kunz, C. Lourie, R.W. McIntyre, J.I. Milbrath, B.D. Miskimen, R. Mitchell, J.H. Papanicolas, C.N. Perdrisat, C.F. Sarty, A.J. Shaw, J. Soong, S.-B. Tieger, D. Tschalær, C. Turchinetz, W. Ulmer, P.E. Van Verst, S. Warren, G.A. Weinstein, L.B. Williamson, S. Woo, R.J. Young, A.
Publication Year :: 2001
Abstract: High-precision 1H(e, elp)φ0 measurements at Q2 = 0.126 (GeV/c)2 are presented. It allows the determination of quadrupole amplitudes in the γ*N → △ transition, in which the reliability of electroproduction models was simultaneously tested. The derived quadrupole-to-dipole (I = 3/2) amplitude ratios, RSM = (-6.5 ± 0.2stat+sys ± 2.5mod)% and REM = (-2.1 ± 0.2stat+sys ± 2.0mod)%, are dominated by model error.

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