Measurement of the partial cross sections σ<inf>tT</inf>, σ<inf>lT</inf>, and (σ<inf>T</inf>+ σ<inf>l</inf>) of the 1H(e,e<sup>′</sup>π<sup>+</sup>)n reaction in the Δ(1232) resonance

Kirkpatrick, JM; Sparveris, NF; Nakagawa, I; Bernstein, AM; Alarcon, R; Bertozzi, W; Botto, T; Bourgeois, P; Calarco, J; Casagrande, F; Distler, MO; 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, CN; Sarty, AJ; Sato, Y; Širca, S; Shaw, J; Six, E; Stave, S; Stiliaris, E; Tamae, T; Tsentalivich, G; Tschalaer, C; Turchinetz, W; Zhou, ZL; Zwart, T

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Genre

Journal Article

Date

2011-08-26

Author

Kirkpatrick, JM
Sparveris, NF
Nakagawa, I
Bernstein, AM
Alarcon, R
Bertozzi, W
Botto, T
Bourgeois, P
Calarco, J
Casagrande, F

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DOI

10.1103/PhysRevC.84.028201

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.

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American Physical Society (APS)

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Physical Review C - Nuclear Physics

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