Naslov
Two-particle correlations on transverse momentum and momentum dissipation in Au-Au collisions at √sNN = 130 GeV

Autori
Adams, J. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Zuo, J.X.

Kolaboracija
STAR Collaboration

Izvornik
Journal of physics. G, Nuclear and particle physics (0954-3899) 34 (2007), 5; 799-810

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

Ključne riječi
correlations ; momentum ; STAR

Sažetak
Measurements of two-particle correlations on transverse momentum pt for Au–Au collisions at √sNN = 130 GeV are presented. Significant large-momentum- scale correlations are observed for charged primary hadrons with 0.15 ≤ pt ≤ 2 GeV/c and pseudorapidity |η| ≤ 1.3. Such correlations were not observed in a similar study at lower energy and are not predicted by theoretical collision models. Their direct relation to mean-pt fluctuations measured in the same angular acceptance is demonstrated. Positive correlations are observed for pairs of particles which have large pt values while negative correlations occur for pairs in which one particle has large pt and the other has much lower pt. The correlation amplitudes per final state particle increase with collision centrality. The observed correlations are consistent with a scenario in which the transverse momentum of hadrons associated with initial-stage semi-hard parton scattering is dissipated by the medium to lower pt.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
The STAR Collaboration.

POVEZANOST RADA