# Quark Matter 2018

13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Energy Dependence of the Fluctuations of Net-Lambda Distributions at STAR

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

### First floor and third floor

#### Palazzo del Casinò

Poster Correlations and fluctuations

### Speaker

Mr Nalinda Kulathunga (University of Houston)

### Description

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.

References
[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.

Content type Experiment STAR Presenter name already specified

### Primary author

Zhenyu Ye (University of Illinois at Chicago)