Identified hadron production at high transverse momenta in p+p collisions at sq sNN=200 GeV in STAR

Journal Article · Fri Feb 06 04:00:00 EST 2009 · The European Physical Journal C

DOI:https://doi.org/10.1140/epjc/s10052-009-0901-x· OSTI ID:979364

XU, Y

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.

• Research Organization: Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 979364
• Report Number(s): BNL--90890-2009-JA; KB0202012
• Journal Information: The European Physical Journal C, Journal Name: The European Physical Journal C Journal Issue: 1 Vol. 62
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALORIMETERS
HADRONS
IONIZATION
PARTICLE IDENTIFICATION
PIONS
PRODUCTION
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS
SPECTRA
STARS
TIME PROJECTION CHAMBERS
TRANSVERSE MOMENTUM
relativistic heavy ion collider