An experimental test of exchange degeneracy in the hyperchange exchange reactions π+p→K+Σ+and K−→π−Σ+ |
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| Authors: | A. Berglund T. Buran P.J. Carlson C.J.S. Damerell I. Endo A.R. Gillman V. Gracco R.J. Homer M.J. Hotchkiss A. Lundby M. Macri B.N. Ratcliff A. Santroni T. Tso F. Wickens J.A. Wilson |
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| Affiliation: | 1. University of Stockholm, Sweden;2. CERN, Geneva, Switzerland;3. Rutherford Laboratory, Chilton, Didcot, Oxon, England, UK;4. Instituto di Fisica dell''Universita, INFN, Sezione di Genova, Italy;5. Physics Department, University of Birmingham, England, UK |
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| Abstract: | For the first time, the line reversed reactions π+p→K+Σ+and K?p→π?Σ+ have been studied in the same apparatus. We present the differential cross sections and polarizations over a large t range and at two momenta, 7.0 and 10.1 GeV/c. The differential cross sections as a function of t are shown for the first time to cross over. Going from the lower to the higher momentum, the differences in cross section between the two reactions diminish at low |t| by about a factor 2. We find large polarizations of opposite sign for the two reactions. The momentum dependence, presented in the form of αeff(t) for the t range 0 to ?2 (GeV/c)2, is compared with the expectations from the K1?K7 trajectory. |
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