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May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
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Energy Dependence of the Fluctuations of Net-Lambda Distributions at STAR

May 15, 2018, 5:00 PM
2h 40m
First floor and third floor (Palazzo del Casinò)

First floor and third floor

Palazzo del Casinò

Poster Correlations and fluctuations Poster Session


Mr Nalinda Kulathunga (University of Houston)


The measurement of conserved charge distributions have generated considerable interest in understanding the cumulants of conserved quantum numbers in the QCD phase diagram, in particular the behavior near a possible critical end point and hadronization near chemical freeze-out line. Net-protons have been used as a proxy for net-baryons. In this poster, we show a first measurement of the efficiency-corrected cumulant ratios ($C_{2}/C_{1}$, $C_{3}/C_{2}$) of net-$\Lambda$, which are subject to strangeness and baryon number conservation, for five beam energies ($\sqrt{s_{NN}} = $ 19.6, 27, 39, 62.4 and 200 GeV Au$+$Au collisions) as a function of centrality and rapidity. We compare our results to the previous STAR results [1, 2], the Poisson and negative binomial expectations, as well as the UrQMD model, the hadron resonance model, and lattice QCD predictions. We deduce chemical freeze-out parameters ($\mu_{B}$, T) and discuss the deviations of the cumulant ratios from Poisson as possible signals for critical fluctuations.

[1] L. Adamczyk et al. (STAR Collaboration), "Energy Dependence of Moments of Net-proton Multiplicity Distributions at RHIC", Phys. Rev. Lett.112, 032302 (2014), arXiv:1309.5681.
[2] L. Adamczyk et al. (STAR Collaboration), "Collision Energy Dependence of Moments of Net-Kaon Multiplicity Distributions at RHIC", arxiv:1709.00773.

Centralised submission by Collaboration Presenter name already specified
Content type Experiment
Collaboration STAR

Primary author

Zhenyu Ye (University of Illinois at Chicago)

Presentation materials