K⁺ Λ Photoproduction at 1200 MeV in the Forward Hemisphere

Citation

Peck, Charles William (1964) K⁺ Λ Photoproduction at 1200 MeV in the Forward Hemisphere. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/SAD3-ZJ67. https://resolver.caltech.edu/CaltechETD:etd-10292002-160443

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Measurements of the angular distribution of the cross section for the photoproduction of the K[superscript +] [Lamda] system from hydrogen have been made in the center of mass angular interval from 15[degrees] to 85[degrees] at a lab photon energy of 1200 MeV. The reaction was identified by detecting K[superscript +] mesons with a magnet spectrometer and a velocity selection system consisting of two Cherenkov counters. The angular distribution is very similar to those at lower energies in that it is peaked forward and is easily fit with a quadratic in cos [theta][subscript c.m.]. Special emphasis was placed on the forward direction in an attempt to find evidence for the one-K-exchange pole. A Taylor-Moravcsik analysis of the data is presented, but the results are inconclusive. The total cross section for the reaction at this energy has been obtained by integrating the best fit to the measurements in the forward direction over the entire sphere. When this is compared with the total photoproduction cross sections at lower energies (also obtained by the integration of incomplete angular distributions), there appears to be no enhancement in the vicinity of 1700 MeV total center of mass energy, contrary to the case in the associated production by pions.

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