We have measured the cross section for $p+p\to p+X$ for ${M_X}^2$ up to a constant fraction of $s$. We observe no rise for $130<E<\mathrm{}400\mathrm{}$ GeV. The inelastic cross section for $0<\mathrm{}{M}^2<0.06s$ is 2.50±0.05 mb for various values of $s$ from 263 to 752 Ge${\mathrm{V}}^2$.

• Received 16 December 1974

DOI:https://doi.org/10.1103/PhysRevLett.34.1121