Elsevier

Nuclear Physics B

Volume 9, Issue 2, 1 February 1969, Pages 249-272
Nuclear Physics B

Elastic backward scattering of pions and kaons

https://doi.org/10.1016/0550-3213(69)90100-XGet rights and content

Abstract

The elastic scattering of gp+ mesons by protons near 180° has been measured at 2.85, 3.30, and 3.55 GeV/c, that of π mesons at 3.30 and 3..55 GeV/c, and that of K+ and K mesons at 3.55 GeV/c. Steeply rising backward peaks are observed at all energies for π+p scattering, whereas the π−1p angular distributions are not as steep. K+p elastic scattering also shows a backward peak. No backward Kp elastic scattering event was found. The upper limit (90% confidence) for the Kp differential cross section is twelve times smaller than the corresponding K+p cross section.

The behaviour of the differential cross section close to 180° can be explained using direct channel resonances. The large ratio of the K+p to Kp cross section can be understood in terms of baryon exchange.

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