Identified charged hadron production in p+p collisions at sqrt(s)=200 and 62.4 GeV

TL;DR

This paper reports measurements of identified charged hadron spectra in proton-proton collisions at two energies, providing baseline data for heavy ion studies and comparing results with theoretical QCD models.

Contribution

It presents detailed transverse momentum distributions and scaling properties for identified hadrons at different energies, enhancing understanding of particle production mechanisms in p+p collisions.

Findings

Measured spectra for pions, kaons, protons, and antiprotons at 200 and 62.4 GeV.

Demonstrated scaling behaviors such as $m_T$ and $x_T$ scaling.

Compared experimental data with perturbative QCD calculations.

Abstract

Transverse momentum distributions and yields for $\pi^{\pm}$, $K^{\pm}$, $p$ and $\bar{p}$ in $p+p$ collisions at $\sqrt{s}$=200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). These data provide important baseline spectra for comparisons with identified particle spectra in heavy ion collisions at RHIC. We present the inverse slope parameter $T_{\rm inv}$, mean transverse momentum $<p_T>$ and yield per unit rapidity $dN/dy$ at each energy, and compare them to other measurements at different $\sqrt{s}$ in $p+p$ and $p+\bar{p}$ collisions. We also present the scaling properties such as $m_T$ scaling, $x_T$ scaling on the $p_T$ spectra between different energies. To discuss the mechanism of the particle production in $p+p$ collisions, the measured spectra are compared to next-to-leading-order or next-to-leading-logarithmic perturbative quantum chromodynamics calculations.