Interactions of low momentum kaons in hydrogen

Abstract

This experimental study of low energy K(^-)p interactions was carried out using the British National Hydrogen Bubble Chamber which incorporated a Track Sensitive Target (T.S.T.) to enhance the conversion of γ-rays into e(^+)e(^-) pairs. The results presented in this work are the channel cross sections for K(^-)p interactions below ~ 300 MeV/c, a determination of the ratio (γ), at zero kaon momentum, of the rates of production of charged hyperons and finally an analysis of the data in terms of the K-matrix parametrisation. Also included is a discussion of errors of measurement which are important in this low momentum region and details of the limitations and problems associated with the T.S.T. type of experiment. The cross-sections are found to confirm the only other precise data in this region (Kim) with the exception of the Kºn n channel which is higher in this TST work. The K-matrix parametrisation is able to describe adequately the combined data of the TST work and that of Kim and gives a consistent determination of the mass of the bound state below threshold (1405 MeV). The value of γ was found by two methods and gave the results 2.38 - 0.04 and 2.35 - 0.07. This resolves the discrepancy between the two previous determinations of this ratio using different experimental techniques. This part of the work resulted in a publication in Nuclear Physics (reference 25).