Measurement of the partial cross sections σtT, σlT, and (σT+ σl) of the 1H(e,e′π+)n reaction in the Δ(1232) resonance

Authors :: Kirkpatrick, J.M. Sparveris, N.F. Nakagawa, I. Bernstein, A.M. Alarcon, R. Bertozzi, W. Botto, T. Bourgeois, P. Calarco, J. Casagrande, F. Distler, M.O. Dow, K. Farkondeh, M. Georgakopoulos, S. Gilad, S. Hicks, R. Holtrop, A. Hotta, A. Jiang, X. Karabarbounis, A. Kowalski, S. Milner, R. Miskimen, R. Papanicolas, C.N. Sarty, A.J. Sato, Y. Širca, S. Shaw, J. Six, E. Stave, S. Stiliaris, E. Tamae, T. Tsentalivich, G. Tschalaer, C. Turchinetz, W. Zhou, Z.-L. Zwart, T.
Publication Year :: 2011
Abstract: We report precision 1H(e,e′π+)n measurements in the Δ(1232) resonance at Q2=0.127(GeV/c)2 obtained at the MIT-Bates out-of-plane scattering facility. These are the lowest, but nonzero, Q2 measurements in the π+ channel. The data offer tests of the theoretical calculations, particularly of the background amplitude contributions. The chiral effective field theory and Sato-Lee model calculations are not in agreement with this experiment. © 2011 American Physical Society.

Tools