Phys. Rev. Lett. 35, 13131316 (1975); DOI: 10.1103/PhysRevLett.35.1313

Electroproduction of Single Pions with Large Transverse Momenta

A. Browman, K. M. Hanson, S. D. Holmes, R. V. Kline, D. Larson, F. M. Pipkin, S. W. Raither, and A. Silverman
Cornell University and Harvard University

Abstract

We report measurements of the electroproduction reaction e + p --> e + pi+ + n for pions produced between 60 and 90 in the virtual-photon-proton center-of-mass system. The cross section is studied as a function of the center-of-mass energy, W, and the square of the virtual-photon mass, -Q^2, in the region 1.2 GeV <~ W <~ 3.0 GeV, 1.2 GeV^2 <~ Q^2 <~ 4.4 GeV^2. The data show a strong W dependence in accord with simple quark-model predictions but exhibit a Q^2 dependence which is difficult to explain in the context of such a model.

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