Abstract
The elastic scattering of K ± mesons on protons has been studied at 5 GeV/c. A total of about 500 000 events have been measured in the c.m. angular range 17° < θ cm < 165° corresponding to 0.2 < − t < (GeV/ c) 2. We observed a K −p backward peak which we have parametrized as d σ/d u = (0.6 ± 0.2) exp [(3.3 ± 0.6) u] μb/(GeV/c) 2, while for the K +p backward peak we find d σ/d u = (17.5 ± 1) exp [(3.6 ± 0.2) u] μb/(GeV/c) 2. The K −p cross-section falls to about 0.03 μ b ( GeV/c) 2 around − t = 5 (GeV/ c) 2, while the K +p cross-section stays in the vicinity of 0.3 μ b ( GeV/c) 2 in the same t-region. The K +p and K −p differential cross-sections have cross-over points at − t = 0.2, 1.1 and about 3.5 (GeV/ c) 2.
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