Evidence of a rise in the antiproton-proton total cross section at the CERN intersecting storage rings

Abstract

We measured the total cross section for p p scattering at s = 52.8 GeV at the CERN ISR, using the direct, total-rate method. The result obtained, σ tot ( pp ) = 44.70 ± 0.53 mb , shows that, in common with σ tot(pp), this cross section also starts to rise in the ISR energy range. We remeasured the total cross section for pp scattering at the same energy, obtaining σ tot(pp) = 43.26 ± 0.33 mb, and found for the difference, Δσ tot = σ tot ( pp ) − σ tot ( pp) , a value of 1.44±0.45 mb.