Large-P⊥distribution and characteristics of the fireball

Large-$P_{\perp }$ distributions for ${\pi }^{\pm }$ and $K^{\pm }$ from $p$-nucleus collisions of the Chicago-Princeton experiment are analyzed using a Bose-type distribution. A discussion is presented on the behavior of two parameters, temperature and transverse velocity of the fireball. The $A$ dependence of cross sections is found to follow a power law $A^{\alpha }$, with $\alpha =0.86\mathrm{}$ for ${\pi }^{\pm }$ as well as for $K^{\pm }$. A comparison with data from a CERN ISR experiment shows a striking similarity in meson production by $p-p$ and $p$-nucleus collisions. Remarks from the viewpoint of the Boltzmann factor are made about the $P_{\perp }$ distribution of the new particle $J\left(3.1\right)\mathrm{}$ from nucleon-nucleus collisions.