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arXiv · 0801.3915

Event-plane flow analysis without non-flow effects

Ante Bilandzic·Naomi van der Kolk·Jean-Yves Ollitrault·Raimond Snellings
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Abstract

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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Ante Bilandzic, Naomi van der Kolk, Jean-Yves Ollitrault, Raimond Snellings. 2008-01-25. Event-plane flow analysis without non-flow effects. https://doi.org/10.1103/physrevc.83.014909

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