Antiproton-proton and proton-proton elastic scattering at 100 and 200 GeV/c

Antiproton-proton elastic scattering has been measured at 100 GeV/c for 0.5<-t<2.5 (GeV/c)² and at 200 GeV/c for 0.9<-t<4 (GeV/c)². The data show that the -t~=1.4 (GeV/c)² dip recently observed at 50 GeV/c persists to higher incident momenta. Proton-proton measurements made at the same beam momenta show similar structure.