Antiproton-proton annihilation into π+π−\pi^{+}\pi^{-} and K+K−K^{+}K^{-} at 6.2 GeV/c

The angular distribution for the two annihilation channels pp to pi /sup +/ pi /sup -/ and pp to K/sup +/K/sup -/ have been measured at 6.2 GeV/c. The two-pion channel shows peripheral peaks for pi /sup +/ and pi /sup -/ going forward, and the two-kaon channel shows a peripheral peak for the K/sup -/ going forward. The results have been compared with the line-reversed elastic backward scattering reactions and also with a constituent interchange model. (20 refs)

Antiproton-proton elastic scattering at 6.2 gev/c

Antiproton-proton elastic scattering data at 6.2 GeV/c in the range 0.3 (GeV/c)/sup 2/<or=-t<or=10.0 (GeV/c)/sup 2/ is presented. The experiment, using spark chambers and proportional chambers, was performed at the CERN Proton Synchrotron. The dip at about -t=0.5 and the structure at about -t=2.2 (GeV/c)/sup 2/ are equally strong at 6.2 GeV/c as they are at 5.0 GeV/c. The differential cross sections around 90 degrees c.m. are not very different at 5.0 GeV/c and at 6.2 GeV/c, whereas in the backward region there is a decrease of the order of one magnitude. (16 refs)