Production of hadrons at large transverse momentum in 200-, 300-, and 400-GeVp−pandp-nucleus collisions

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Abstract

Measurements of the invariant cross section $\frac{E{d}^{3}\ensuremath{\sigma}}{{d}^{3}p}$ are presented for the production of hadrons ($\ensuremath{\pi}$, $K$, $p$, and $\overline{p}$) at large transverse momentum (${p}_{\ensuremath{\perp}}$) by 200-, 300-, and 400-GeV protons incident on ${\mathrm{H}}_{2}$, ${\mathrm{D}}_{2}$, Be, Ti, and W targets. The measurements were made at a laboratory angle of 77 mrad, which corresponds to angles near 90\ifmmode^\circ\else\textdegree\fi{} in the c.m. system of the incident proton and a single nucleon at rest. The range in ${p}_{\ensuremath{\perp}}$ for the data is $0.77\ensuremath{\le}{p}_{\ensuremath{\perp}}\ensuremath{\le}6.91$ GeV/c, corresponding to values of the scaling variable ${x}_{\ensuremath{\perp}}=\frac{2{p}_{\ensuremath{\perp}}}{\sqrt{s}}$ from 0.06 to 0.64. For $p\ensuremath{-}p$ collisions, the pion cross sections can be represented in the region ${x}_{\ensuremath{\perp}}>35$ by the form $(\frac{1}{{{p}_{\ensuremath{\perp}}}^{n}}){(1\ensuremath{-}{x}_{\ensuremath{\perp}})}^{b}$, with $n=8$ and $b=9$. The ratio of ${\ensuremath{\pi}}^{+}$ to ${\ensuremath{\pi}}^{\ensuremath{-}}$ production grows as a function of ${x}_{\ensuremath{\perp}}$ to a value larger than 2 at ${x}_{\ensuremath{\perp}}\ensuremath{\gtrsim}0.5$. The ratios of the production of ${K}^{+}$ and protons to ${\ensuremath{\pi}}^{+}$ and of ${K}^{\ensuremath{-}}$ and antiprotons to ${\ensuremath{\pi}}^{\ensuremath{-}}$ also scale with ${x}_{\ensuremath{\perp}}$ for $p\ensuremath{-}p$ collisions. The ${K}^{\ifmmode\pm\else\textpm\fi{}}$, $p$, and $\overline{p}$ fitted values for $n$ and $b$ are given. Particle ratios are also presented for ${\mathrm{D}}_{2}$, Be, Ti, and W targets and the dependences on atomic weight ($A$) are discussed.

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