Long range rapidity correlations and $v_2$ of identified particles in $d$$+$Au collisions

May 20, 2014, 3:20 PM
europium (darmstadtium)



Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Correlations and Fluctuations Correlations and fluctuations


Dr shengli huang (PHENIX Collaboration)


Traditionally $p(d)$$+$A collisions at RHIC and the LHC were considered as a tool to study cold nuclear matter effects. Production of the hot and dense medium in such collisions was not expected. However recent measurements has challenged this assumption with the observation of long-range correlations in angular distributions of hadron pairs with low transverse momentum. The observed modulations are very similar to those previously seen in A$+$A collisions which are widely thought to arise from hydrodynamic flow. The same hydrodynamic models used in heavy ion collisions have been successful in describing the $p(d)$$+$A results. However the long-range correlations observed in $p(d)$$+$A collisions can also be qualitatively described within the Color Glass Condensate models. In this talk we present new PHENIX results for azimuthal angular correlations between charged hadrons measured at mid-rapidity ($|\eta|<0.35$) and energy deposited in calorimeter towers in the Au-going direction at large rapidity ($-3.7<\eta<-3.1$) in central $d$$+$Au collisions at $\sqrt{s_{NN}} = 200$~GeV. We report the first direct evidence for enhanced near-side angular correlations across $|\Delta\eta| > 2.75$ at RHIC. We also present the first measurement of $v_2$ for identified charged pions and (anti-)protons in $d$$+$Au at RHIC, and observe a mass-ordering pattern similar to that seen in A$+$A collisions.
On behalf of collaboration: PHENIX

Primary author

Dr shengli huang (PHENIX Collaboration)

Presentation materials