Identified Hadron Compositions in p+p and Au+Au Collisions at High Transverse Momenta at √sNN=200 GeV (CROSBI ID 189353)
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Podaci o odgovornosti
Agakishiev, G. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Zoulkarneeva, Y.
engleski
Identified Hadron Compositions in p+p and Au+Au Collisions at High Transverse Momenta at √sNN=200 GeV
We report transverse momentum (pT≤15 GeV/c) spectra of π±, K±, p, p̅ , KS0, and ρ0 at midrapidity in p+p and Au+Au collisions at √sNN=200 GeV. Perturbative QCD calculations are consistent with π± spectra in p+p collisions but do not reproduce K and p(p̅ ) spectra. The observed decreasing antiparticle-to-particle ratios with increasing pT provide experimental evidence for varying quark and gluon jet contributions to high-pT hadron yields. The relative hadron abundances in Au+Au at pT≳8 GeV/c are measured to be similar to the p+p results, despite the expected Casimir effect for parton energy loss.
hadron; composition; transverse; STAR
STAR Collaboration
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Podaci o izdanju
108
2012.
072302-1-072302-6
objavljeno
0031-9007
10.1103/PhysRevLett.108.072302