Transverse momentum spectra of hadrons in $p+p$ collisions at CERN SPS energies from the UrQMD transport model

Abstract

The UrQMD transport model, version 3.4, is used to study the new experimental data on transverse momentum spectra of ${\pi }^{\pm }$, $K^{\pm }$, $p$ and $\bar{p}$ produced in inelastic $p+p$ interactions at SPS energies, recently published by the NA61/SHINE Collaboration. The comparison of model predictions to these new measurements is presented as a function of collision energy for central and forward particle rapidity intervals. In addition, the inverse slope parameters characterizing the transverse momentum distributions are extracted from the predicted spectra and compared to the corresponding values obtained from NA61/SHINE distributions, as a function of particle rapidity and collision energy. A complex pattern of deviations between the experimental data and the UrQMD model emerges. For charged pions, the fair agreement visible at top SPS energies deteriorates with the decreasing energy. For charged $K$ mesons, UrQMD significantly underpredicts positive kaon production at lower beam momenta. It also underpredicts the central rapidity proton yield at top collision energy and overpredicts antiproton production at all considered energies. We conclude that the new experimental data analyzed in this paper still constitute a challenge for the present version of the model.

15 pages, 10 figures

References in corpus (5)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Fully integrated transport approach to heavy ion reactions with an intermediate hydrodynamic stage
• Measurements of ${\pi }^{\pm }$, K${}^{\pm }$, p and $\bar{\text{p}}$ spectra in proton-proton interactions at 20, 31, 40, 80 and 158 GeV/c with the NA61/SHINE spectrometer at the CERN SPS
• Recent results from NA61/SHINE
• System-size and energy dependence of particle momentum spectra: The UrQMD analysis of p+p and Pb+Pb collisions

Cited by in corpus (3)

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