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 PJ Carlson CJS Damerell I Endo AR Gillman V Gracco RJ Homer MJ Hotchkiss A Lundby M Macri BN Ratcliff A Santroni T Tso F Wickens JA Wilson |
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| Institution: | 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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