Naslov
Identified hadron spectra at large transverse momentum in p+p and d+Au collisions at s(NN)**(1/2) = 200-GeV

Autori
Adams, J. ; ... ; Planinić, Mirko ; Poljak, Nikola, et.al

Izvornik
Physics Letters B (0370-2693) B (2006), 637; 161-169

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
p; anti-p; yield; ratio; nuclear reaction; model; RHIC

Sažetak
We present the transverse momentum (pT) spectra for identified charged pions, protons and anti-protons from p+p and d+Au collisions at \sqrts_NN = 200 GeV. The spectra are measured around midrapidity (|y| < 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 the 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 xT-scalings for the momentum range where particle production is dominated by hard processes (pT > 2 GeV/c). The nuclear modification factor around midrapidity are found to be greater than unity for charged pions and to be even larger for protons at 2 < pT < 5 GeV/c.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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