Four-momentum transfer between groups of secondary particles in proton-nucleus interactions at 200 GeV

Data on interactions of 200-GeV protons in nuclear emulsion has been used to determine the lower limit of the four-momentum transfer between groups of secondary particles in jets. It is found that Δ/sub parallel/ in a jet increases linearly with the multiplicity of the jet. All the jets with large multiplicity show clear pronounced maxima in Δ/sub parallel/ plotted against log tan theta/sub L/. The four-momentum transferred between groups of secondary particles produced in the above interactions has been studied to determine the nature of the particle exchanged between these groups. The results are in agreement with the prediction of the Pomeranchuk-pole-exchange model