Identified hadron spectra at large transverse momentum in p+p and d+Au collisions at ÃsNN = 200 GeV

John Adams, Lee Barnby, CO Blyth, Leon Gaillard, Peter Jones, John Nelson, Anthony Timmins

Research output: Contribution to journalArticle

Abstract

We present the transverse momentum (PT) spectra for identified charged pions, protons and anti-protons from p + p and d + Au collisions at root sNN = 200 GeV. The spectra are measured around midrapidity (vertical bar y vertical bar <0.5) over the range of 0.3 <PT <10 GeV/c with particle identification from the ionization energy loss and its relativistic rise in the time projection chamber and time-of-flight in STAR. The charged pion and proton + anti-proton spectra at high PT in p + p and d + Au collisions are in good agreement with a phenomenological model (EPOS) and with next-to-leading order perturbative quantum chromodynamic (NLO pQCD) calculations with a specific fragmentation scheme and factorization scale. We found that all proton, anti-proton and charged pion spectra in p + p collisions follow x(T)-scating for the momentum range where particle production is dominated by hard processes (p(T) greater than or similar to 2 GeV/c). The nuclear modification factor around midrapidity is found to be greater than unity for charged pions and to be even larger for protons at 2 <PT <5 GeV/c. (c) 2006 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)161-169
Number of pages9
JournalPhysics Letters B
Volume637 (3)
Publication statusPublished - 8 Jun 2006

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