Abstract
We report the transverse momentum (p{sub 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 {radical}s{sub NN} = 200 GeV. The spectra are measured around mid-rapidity (|y| < 0.5) over the range of 3 < p{sub 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{sub 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 n{sup -}/n{sup +}, {bar p}/p, p/n{sup +} and {bar p}/{pi}{sup -} in p+p collisions.
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