Naslov
Identified particle distributions in pp and Au+Au collisions at sqrt{; ; snn}; ; =200 GeV

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

Izvornik
Physical review letters (0031-9007) 92 (2004), 112301; 1-6

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

Ključne riječi
charged particle; multiple production; pi; K; p

Sažetak
Transverse mass and rapidity distributions for charged pions, charged kaons, protons and antiprotons are reported for sqrt{; ; s_NN}; ; =200 GeV pp and Au+Au collisions at RHIC. The transverse mass distributions are rapidity independent within |y|<0.5, consistent with a boost-invariant system in this rapidity interval. Spectral shapes and relative particle yields are similar in pp and peripheral Au+Au collisions and change smoothly to central Au+Au collisions. No centrality dependence was observed in the kaon and antiproton production rates relative to the pion production rate from medium-central to central collisions. Chemical and kinetic equilibrium model fits to our data reveal strong radial flow and relatively long duration from chemical to kinetic freeze-out in central Au+Au collisions. The chemical freeze-out temperature appears to be independent of initial conditions at RHIC energies.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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