MEASUREMENTS OF ELASTIC PROTON-PROTON SCATTERING AT LARGE MOMENTUM-TRANSFER AT THE CERN INTERSECTING STORAGE-RINGS

Final results of our measurements of elastic proton-proton scattering at the CERN Intersecting Storage Rings (ISR) for c.m. energies √s from 23 to 63 GeV and momentum transfers |t| from 0.8 to 10 GeV2 are presented. Absolute differential cross sections have been obtained using the split-field magnet detector facility (SFM) at the five standard energies for integrated luminosities ranging from 0.3 to 4.9 (pb)-1. The rising total cross section is found to define a scale for diffractive phenomena near the forward peak, including the position of the diffraction minimum near t = -1.4 GeV2. The cross section at the minimum is strongly energy dependent, approximately as the ratio of the real to imaginary part of the scattering amplitude in the forward direction. The phase of the scattering amplitude is found to change sign near the minimum. The component of diffraction scattering beyond the second maximum has a much weaker t-dependence than expected in simple eikonal or constituent pictures connecting this region to the forward peak. A further break in slope is observed near t = -6 GeV2. There is no evidence for another minimum for t values up to 10 GeV2. © 1979.