Event-plane flow analysis without non-flow effects

Details Event-plane flow analysis without non-flow effects Event-plane flow analysis without non-flow effects

2008-01-25

arxiv.org/abs/0801.3915v2

Phys.Rev.C83:014909,2011

Physics

Nuclear Physics

Nuclear Experiment

8 pages. Extended revision: Section II rewritten

Scientific paper

10.1103/PhysRevC.83.014909

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 $p_t$. Various methods (cumulants, Lee-Yang zeroes) have been proposed to eliminate nonflow effects, but their implementation is tedious, which has limited their application so far. In this paper, 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 RHIC and LHC.

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