Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{; ; ; s_{; ; ; NN}; ; ; }; ; ; =200$ GeV from STAR (CROSBI ID 170189)
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Podaci o odgovornosti
Aggarwal, M.M. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ...
engleski
Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{; ; ; s_{; ; ; NN}; ; ; }; ; ; =200$ GeV from STAR
Yields, correlation shapes, and mean transverse momenta \pt{; ; ; }; ; ; of charged particles associated with intermediate to high-\pt{; ; ; }; ; ; trigger particles ($2.5 < \pt < 10$ \GeVc) in d+Au and Au+Au collisions at $\snn=200$ GeV are presented. For associated particles at higher $\pt \gtrsim 2.5$ \GeVc, narrow correlation peaks are seen in d+Au and Au+Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle $\pt < 2$ \GeVc, a large enhancement of the near- ($\dphi \sim 0$) and away-side ($\dphi \sim \pi$) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au+Au collisions compared to d+Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at $\dphi \sim \pi$ in central Au+Au collisions.
particle; yield particle; production hadron hadron; correlation jet; fragmentation STAR hadron; angular distribution charged particle; transverse momentum interaction; (deuteron nucleus) nucleus nucleus; interaction heavy ion; scattering charged particle; multiplicity Brookhaven RHIC Coll 200 GeV-cms/nucleon
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Podaci o izdanju
82 (2)
2010.
024912-1-024912-14
objavljeno
0556-2813
10.1103/PhysRevC.82.024912