K+p elastic scattering at 3.5 and 5.0 GeV/c

Abstract

The present report concerns three experiments of K+ and K~ mesons performed at CERN in the Saclay 80 cm hydrogen bubble chamber.I. The first experiment is a study of elastic scattering in a collaboration between Brussels, CERN and Stockholm. Preliminary results are presented below.The angular distribution of the elastic scattering shows a dominant diffraction peak (Fig. 1). The angular distribution is fitted by an exponential, which corresponds to an optical model with black disc. The slope of the exponential is directly related to the disc radius.The slope of the diffraction pattern is given as a function of K+ momentum on Fig. 2. Our results are shown together with those obtained by other groups [1, 21. A shrinking of the diffraction peak is observed, which is related to the increase of the inelastic cross section, while the total cross section remains constant.II. The second experiment is a study of reaction

Experimental Knowledge of the Real Parts of the K±p Forward Scattering Amplitudes

“…We have found from the available literature suitable experimental data on the angular distributions of the elastic differential cross sections a t 73 energies for K-p scattering [16-351 and at 49 energies for K+p scattering [33, [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. For each energy a t which a reliable extrapolation to the forward direction was made in the paper originally reporting the experimental data, we' used the reported value of (du/dQ), or (duldt), for our determination of the real part of the forward scattering amplitude.…”

Further Evidence for Baryon Exchange fromK+pBackward Elastic Scattering

“…We thank Professor Walker for making these fits available to us prior to publication. 7 G. Kramer and P. Stichel, Z. Physik 178, 519 (1964). We simplify Eqs.…”