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DOE OSTI2011

Anisotropic flow analysis in the ALICE experiment

Anisotropic flow is one of the observables which is sensitive to the properties of the created hot and dense system in heavy-ion collisions. Unfortunately detailed measurements of anisotropic flow are difficult due to contributions from nonflow correlations. In these proceedings a recently developed method for flow analysis, called Q-cumulants (a.k.a. direct cumulants), will be presented. This new method is used to study azimuthal correlations in p-p collisions at 7 TeV with the ALICE detector.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

DOE OSTI2011

Flow analysis with cumulants: Direct calculations

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Bilandzic, Ante↗

DOE OSTI2011

Event-plane flow analysis without nonflow effects

The event-plane method, which is widely used to analyze anisotropic flow in nucleus-nucleus collisions, is known to be biased by nonflow effects, especially at high p{sub t}. Various methods (cumulants, Lee-Yang zeros) have been proposed to eliminate nonflow effects, but their implementation is tedious, which has limited their application so far. In this article, we show that the Lee-Yang-zeroes method can be recast in a form similar to the standard event-plane analysis. Nonflow correlations are strongly suppressed by using the information from the length of the flow vector, in addition to the event-plane angle. This opens the way to improved analyses of elliptic flow and azimuthally sensitive observables at the Relativistic Heavy Ion Collider and the Large Hadron Collider.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗