Phys. Rev. D 1, 12851303 (1970); DOI: 10.1103/PhysRevD.1.1285

Search for Violation of Time-Reversal Invariance in Inelastic e-p Scattering

J. A. Appel, J. R. Chen, J. Sanderson, G. Gladding, M. Goitein, K. M. Hanson, D. C. Imrie, T. Kirk, R. Madaras, R. V. Pound, L. Price, Richard Wilson, and C. Zajde
Harvard University

Abstract

Electrons have been scattered inelastically from a hydrocarbon target containing protons polarized normal to the scattering plane. Scattered electrons with energies corresponding to the production of the Delta (1236), N(1512), and N(1688) pion-nucleon resonances were observed. A search was made for changes in the cross section as the target polarization was reversed. Any changes would have been evidence of a violation of time-reversal invariance in the electromagnetic interactions of the hadrons. No such changes were observed. With the maximum time-reversal-violating effect possible, the asymmetry would be 10 times the upper limit of this experiment. Early attempts at a coincidence-polarization experiment are described in an appendix.

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