It is found that to parametrize the $\overline{p}$ invariant cross section in low-energy $p-p$ collisions, a better scaling variable $\Delta X_R=X_R-X_{Rmin}$ can be used instead of the usual radial variable $X_R$, where $X_{Rmin}$ is the minimum of $X_R$ for a given $s$ and $p_t$. The ratio of the $\overline{p}$ invariant cross section to the corresponding radial-scaling limit is seen to be independent of $p_t$ explicitly, and is monotonically and quickly approaching to one from above for increasing $s$.

• Received 22 April 1982

DOI:https://doi.org/10.1103/PhysRevD.26.1179