Multiplicity dependence of inclusive pt spectra from p−p collisions at s=200 GeV

Le résumé fourni par la source

We report measurements of transverse momentum ${p}_{t}$ spectra for ten event multiplicity classes of $p\mathrm{\text{\ensuremath{-}}}p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$. By analyzing the multiplicity dependence we find that the spectrum shape can be decomposed into a part with amplitude proportional to multiplicity and described by a L\'evy distribution on transverse mass ${m}_{t}$, and a part with amplitude proportional to multiplicity squared and described by a Gaussian distribution on transverse rapidity ${y}_{t}$. The functional forms of the two parts are nearly independent of event multiplicity. The two parts can be identified with the soft and hard components of a two-component model of $p\mathrm{\text{\ensuremath{-}}}p$ collisions. This analysis then provides the first isolation of the hard component of the ${p}_{t}$ spectrum as a distribution of simple form on ${y}_{t}$.

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