Correlations between High-Momentum Mesons inp+p→π+π+Xats12=63GeV

Abstract

In $\mathrm{pp}$ collisions at $\sqrt{s}=62.3\mathrm{}$ GeV where each proton fragments into at least one low-$p_T$, high-$x$ pion, no significant correlations for ${\pi }^{+}{\pi }^{+}$, ${\pi }^{+}{\pi }^{-}$, and ${\pi }^{-}{\pi }^{-}$ are found, thus excluding quark exchange with Brodsky-Gunion counting rules as the dominant interaction mechanism. This, together with the experimental $x$ dependence of single-particle spectra, suggests the introduction of a new counting rule, which is discussed.