2009/01/06 by Yichun Xu
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #nucl-ex
paper · pdf · doi:10.1140/epjc/s10052-009-0901-x
published as Eur.Phys.J.C62:187-190,2009 · 4 pages, 4 figures, Hot Quark 2008 proceeding
arxiv created 2009/01/06 · openalex publication_date 2009/02/05 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We report the transverse momentum (p T ) 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 √sNN=200 GeV. The spectra are measured around mid-rapidity (|y|<0.5) over the range of 3<p T <15 GeV/c with particle identification (PID) by the relativistic ionization energy loss (rdE/dx) in the Time Projection Chamber (TPC) of the Solenoidal Tracker at RHIC (STAR). The charged pion, proton and anti-proton spectra at high p T 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 π −/π +, p/p , p/π + and p/π- in p+p collisions.