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K-p INTERACTION AROUND 1 GeV/c PRELIMINARY RESULTS OF A PHASE SHIFT ANALYSIS *

By D. W. G. S. Leith

Abstract

I wish to present a summary on the recent work of the CERN-Heidelberg-Saclay collaboration. ’ The data come from a systematic K-p bubble chamber investigation using the Saclay 81 cm HBC in a low momentum separated K- beam2 at the CERN P. S. An exposure of about 150,000 pictures (with hydrogen), were taken at 23 different momenta in the range of N 800- 1200 MeV/c. The momentum values are shown in Table I. The average momentum spread at the entrance to the chamber is of order & 10 MeV/c. The yield of the experiment is-0.2 events per pb at each momentum setting. The ana!ysis of the film is about 80 % finished.. The purpose of the talk is to report on an ongoing effort on a partial wave analysis of the K-p system around 1 GeV/c. The results are preliminary and the method is our first approximation. I give these warnings because (a) we use a crude momentum dependence for the background amplitudes, namely a linear continuity in momentum is demanded; (b) we fit each channel separately with no attempt, at present, to do an overall fit; and finally, (c) we make no claim to the uniqueness of our fit. We present a fit which makes a certain amount of sense, which has certain apparent difficulties, which will certainly be superseded in further analysis but which serves as a demonstration for the method, our progress and the complexity of the region. Firstly I would like to show four figures, (Figs. 1 through 4), summarizing the cross section information on the channels I shall discuss, and demonstrating Work supported by the U.S. Atomic Energy Commission

Year: 1968
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