https://doi.org/10.1140/epjc/s10052-009-0901-x
Regular Article - Experimental Physics
Identified hadron production at high transverse momenta in p+p collisions at
GeV in STAR
1
Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
2
Physics Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
* e-mail: xuyichun@rcf.rhic.bnl.gov
Received:
30
September
2008
Published online:
6
February
2009
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
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/π
+ and
in p+p collisions.
PACS: 12.38.Bx – / 13.85.Ni –
© Springer-Verlag , 2009
