Non-flow correlations and elliptic flow fluctuations in Au+Au collisions at sqrt(s_NN)=200GeV

TL;DR

This paper reports on the measurement of elliptic flow fluctuations in Au+Au collisions at 200 GeV, showing significant event-by-event variations consistent with initial condition models, and correcting for non-flow effects.

Contribution

It provides the first measurement of elliptic flow fluctuations with non-flow correction, aligning experimental results with theoretical initial condition models.

Findings

Elliptic flow fluctuations are 25-50% in magnitude.

Results agree with color glass condensate and Glauber model predictions.

Non-flow effects have been independently measured and corrected.

Abstract

We present first results on event-by-event elliptic flow fluctuations in nucleus-nucleus collisions corrected for effects of non-flow correlations where the magnitude of non-flow correlations has been independently measured in data. Over the measured range in centrality, we see large relative fluctuations of 25-50%. The results are consistent with predictions from both color glass condensate and Glauber type initial condition calculations of the event-by-event participant eccentricity fluctuations.