Identified hadron production at high transverse momenta in p+p collisions at sqrt(NN) = 200 GeV in STAR

TL;DR

This paper measures high transverse momentum identified hadron spectra in proton-proton collisions at 200 GeV, compares results with theoretical models, and analyzes particle ratios to understand particle production mechanisms.

Contribution

It provides detailed high-pT spectra for pions, protons, and anti-protons in p+p collisions at 200 GeV, with particle identification and comparison to NLO pQCD calculations.

Findings

High-pT spectra measured up to 15 GeV/c.

Comparison with NLO pQCD shows good agreement.

Particle ratios analyzed at high pT.

Abstract

We report the transverse momentum (pT) distributions for identified charged pions, protons and anti-protons using events triggered by high deposit energy in the Barrel Electro-Magnetic Calorimeter (BEMC) from p + p collisions at psNN = 200 GeV. The spectra are measured around mid-rapidity (|y|<0.5) over the range of 3<pT<15 GeV/c with particle identification (PID) by the relativistic ionization energy loss (rdE/dx) in the Time Projection Chamber (TPC) in the Solenoidal Tracker at RHIC (STAR). The charged pion, proton and anti-proton spectra at high pT are compared with published results from minimum bias triggered events and the Next-Leading-Order perturbative quantum chromodynamic (NLO pQCD) calculations (DSS, KKP and AKK 2008). In addition, we present the particle ratios of pi-/pi+, pbar/p, p/pi+ and pbar/pi- in p + p collisions.