We investigate baryon-antibaryon contributions to the $pp$ total cross section, using simple models. We find that the $B\overline{B}$ threshold is lower than needed to explain the rise in ${\sigma }_{\mathrm{pp}}$, if final-state interactions are important.

• Received 26 August 1974

DOI:https://doi.org/10.1103/PhysRevD.11.692