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Further Analysis of the Massachusetts Institute of Technology Antiproton Event

conserved in fast interactions. In the Pais and Gell- Mann formulation, for example, this quantum number has the value -1 for K--mesons and hyperons, while for K+-mesons its value is +1. Consequently, a K-- meson can be absorbed by a nucleon to produce a hyperon and a wr meson, in a fast interaction, conserving strangeness, while a K+-meson can undergo only scat- tering or charge exchange. While K--mesons can also undergo scattering and charge exchange, the present results indicate that absorption predominates strongly. The difference between K- and K+ interactions5 with respect to both the size of the cross section8 and the types of interaction are in excellent agreement with the requirement of conservation of strangeness in fast interactions. The authors are happy to acknowledge the constant help and interest of Dr. D. M. Ritson and Dr. A. Pevsner. Special thanks are due Mrs. A. Lanza and Mrs. N. Pal for their scanning and analysis of the emulsions. We are indebted to Dr. E. Lofgren and the Bevatron staff whose cooperation made this exposure possible. * This work was supported in part by the joint program of the U. S. Atomic Energy Commission and the Office of Naval http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

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