Polarization Structure in p-p Elastic Scattering

Abstract

We present here the results of an experiment to study the polarization in p-p elastic scattering at the incident momenta 5.15, 7.00, and 12.33 GeV/c, at t values ranging between -0.5 and -6.5 (GeV/c) 2 . At each momentum we observe a relative maximum in the polarization around t = -1.8 (GeV/c) 2 . At 12.33 GeV/c the data exhibit a double zero near t = -2.4 (GeV/c) 2 and another relative maximum near t = -2.9 (GeV/c) 2 . The results are discussed in terms of the Chu-Hendry optical model.

Measurement of proton proton elastic scattering in pure initial spin states at 11.75 GeV/c

“…3 along with other data. Our results generally agree well with other measurements of A near 12 GeV/c [2,12,16] but are more precise. There are no previous measurements of Cnn near 12 GeV/c.…”

“…The general behavior of A was known from earlier experiments [2,12,16,17] and our new more precise measurements only emphasize it. In the diffraction peak region A decreases rapidly with energy and is typically 5% near 12 GeV/c.…”

Polarization and N-N elastic scattering amplitudes

“…Those polarization measurements which exist (10) are consistent with these predicted regularities. Further measurements of the polarization asymmetry at various energies, which could be done a t Fermilab and at RHIC, are needed to test these underlying principles.…”

Proton-proton scattering above 3 GeV/c

“…Analyzing power for pp elastic scattering as a function of the four-momentum transfer squared t for different beam momenta (in GeV/c) as indicated in the figure. The inverse triangles are data from FNAL [76], the squares are from ZGS ANL [70,71,72,73], and the open circles are from CERN PS [74,75]. The shaded bands illustrate the uncertainty of our calculation.…”