### Session Q10: Relativistic Heavy Ions II

10:45 AM–12:33 PM, Monday, April 2, 2012
Room: Embassy A

Chair: Berndt Mueller, Duke University

Abstract ID: BAPS.2012.APR.Q10.8

### Abstract: Q10.00008 : Elliptic flow results from 2.76 GeV PbPb collisions measured by CMS

12:09 PM–12:21 PM

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#### Author:

Eric Appelt
(Vanderbilt University)

We report on the CMS measurements of the unidentified charged hadron anisotropy parameter, v2, using four different methods: the event-plane, two- or four particle cumulants, and Lee-Yang zeros. Consistent results are found for the different methods after considering their respective sensitivities to non-flow correlations and event-by-event fluctuations in the initial conditions. The anisotropy is studied as a function of transverse momentum, pseudorapidity and centrality in a broad kinematic range: 0.3 $<$ pT $<$ 20 GeV/c, $|\eta|$ $<$ 2.4, and in 12 centrality classes in the range 0-80\%. The CMS results are compared to results obtained at lower center-of-mass energies and various scaling behaviors are examined. The eccentricity-scaled v2 is found to obey a universal scaling with the transverse particle density in different collisions systems and center-of-mass energies. These results are obtained from a large sample of over 22 million events, representing a nearly ten fold statistical increase over previously reported CMS results.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.APR.Q10.8