Characteristics ofV0andγproduction inppinteractions at 205 GeV/c

In an exposure of the Fermi National Accelerator Laboratory 30-in. bubble chamber to a beam of 205-GeV/c protons, we have determined total and differential cross sections for the inclusive reactions $p+p\to \gamma +X$, ${\pi }^0+X$, $\left(\frac{K^0}{{\overline{K}}^0}\right)+X$, $\Lambda +X$. Invariant distributions in $x$ indicate that for $\gamma$, $K^0$, $\Lambda$ production, scaling has set in somewhere before 69 GeV. The $\gamma$ differential cross sections are consistent with the relation $\frac{d\sigma }{d{P}_u}\left({\pi }^0\right)=\frac{1}{2}\left[\frac{d\sigma }{d{P}_u}\right({\pi }^{+})+\frac{d\sigma }{d{P}_u}({\pi }^{-}\left)\right]$ for all $P_u$, where $P_u=P_L^{*} or P_{\perp }$. The differential cross sections for $\Lambda$ and $K^0$ production indicate a break in the distribution at $|t-t_{min}|=1.5\mathrm{}{\left(\frac{\mathrm{GeV}}{c}\right)}^2 \mathrm{and} 0.5{\left(\frac{\mathrm{GeV}}{c}\right)}^2$, respectively. The $\Lambda$ polarization is found to be - (0.25 ± 0.26), consistent with zero throughout the $x$ region.