Elliptic Flow Fluctuations In Au Research Articles

Non-flow correlations and elliptic flow fluctuations inAu+Aucollisions atsNN=200GeV

This paper presents results on event-by-event elliptic flow fluctuations in Au+Au collisions at sqrt(s_NN)=200Gev, where the contribution from non-flow correlations has been subtracted. An analysis method is introduced to measure non-flow correlations, relying on the assumption that non-flow correlations are most prominent at short ranges (Delta eta < 2). Assuming that non-flow correlations are of the order that is observed in p+p collisions for long range correlations (Delta eta > 2), relative elliptic flow fluctuations of approximately 30-40% are observed. These results are consistent with predictions based on spatial fluctuations of the participating nucleons in the initial nuclear overlap region. It is found that the long range non-flow correlations in Au+Au collisions would have to be more than an order of magnitude stronger compared to the p+p data to lead to the observed azimuthal anisotropy fluctuations with no intrinsic elliptic flow fluctuations.

Non-flow correlations and elliptic flow fluctuations in Au + Au collisions at GeV

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.

Elliptic flow fluctuations in Au+Au collisions at GeV

In this talk, we report an analysis of elliptic flow (v2), non-flow (δ2) and v2 fluctuations for the STAR Collaboration at middle rapidity in GeV Au+Au collisions. We compare the results to models of the fluctuations in the initial eccentricity of the overlap zone.

NeXSPheRIO results on elliptic-flow fluctuations at RHIC

By using the NeXSPheRIO code, we study the elliptic-flow fluctuations in Au + Au collisions at 200 A GeV. It is shown that, by fixing the parameters of the model to correctly reproduce the charged pseudorapidity and the transverse-momentum distributions, reasonable agreement of 〈v 2〉 with data is obtained, both as function of pseudorapidity as well as of transverse momentum, for charged particles. Our results on elliptic-flow fluctuations are in good agreement with the recently measured data on experiments.

Elliptic flow fluctuations in collisions at RHIC

We present first results on event-by-event elliptic flow fluctuations in Au+Au collisions at obtained with the PHOBOS detector. Over the measured range in centrality, large relative fluctuations of 40–50% are found. The elliptic flow fluctuations are well described as being proportional to fluctuations in the shape of the initial collision region, as estimated event by event with the participant eccentricity using Glauber Monte Carlo.

Elliptic flow fluctuations in Au+Au collisions at

We report first measurements of elliptic flow (v2) fluctuations for the STAR collaboration at middle rapidity in collisions. We analyse the multiplicity dependence of the flow vector length distribution to disentangle non-flow correlations from v2 fluctuations. We find that the width of the v2 distribution is approximately 36% of the mean v2 and, within errors, independent of collision centrality. This value coincides with eccentricity fluctuations, apparently leaving little room for other sources of fluctuations.