Measurement Of The R-Lt Response Function For Pi(0) Electroproduction At Q(2)=0.070 (Gev/C)(2) In The N ->Delta Transition

Nf Sparveris,R Alarcon, D Barkhuff, A Bernstein, W Bertozzi, J Calarco, F Casagrande, J Chen,J Comfort,Mo Distler, G Dodson, S Dolfini, A Dooley,K Dow, M Farkondeh,S Gilad,R Hicks, M Holtrop,A Hotta, X Jiang, N Kaloskamis, A Karabarbounis,S Kowalski,C Kunz, D Margaziotis,C Mertz,R Milner, R Miskimen,I Nakagawa,Cn Papanicolas, Mm Pavan,G Peterson,A Ramirez, D Rowntree,Aj Sarty,J Shaw,E Six,S Soong, E Stiliaris, D Tieger, C Tschalaer, W Turchinetz, C Vellidis, Ga Warren,A Young, J Zhao,Zl Zhou, T Zwart

PHYSICAL REVIEW C（2003）

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摘要

Quadrupole amplitudes in the gamma(*)N-->Delta transition are associated with the issue of nucleon deformation. A search for these small amplitudes has been the focus of a series of measurements undertaken at Bates/MIT by the OOPS Collaboration. We report on results from H(e,e(')p)pi(0) data obtained at Q(2)=0.070 (GeV/c)(2) and invariant mass of W=1155 MeV using the out-of-plane detection technique with the OOPS spectrometers. The sigma(LT) and sigma(T)+epsilonsigma(L) response functions were isolated. These results, along with those of previous measurements at W=1172 MeV and Q(2)=0.127 (GeV/c)(2), aim in elucidating the interplay between resonant and nonresonant amplitudes.

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