Fluctuations of net-Lambda distributions in Au+Au collisions measured as a function of collision energy with the STAR detector at RHIC

Chemical freeze-out parameters (temperature and baryochemical potential) in the QCD phase diagram can be extracted using measured moments of multiplicity distributions of conserved charges. Previously, net-Kaons were used as a proxy for net-strangeness, but we approach the problem using net-Lambda ($\Lambda - \bar{\Lambda}$) cumulants as they are subject to strangeness and baryon number conservation laws. We show the first three cumulants $(C_{1}, C_{2}, C_{3})$ and cumulant ratios $(C_{2}/C_{1}, C_{3}/C_{2})$ of net-Lambda and compare them to Poisson baseline and negative binomial expectation for four beam energies ($\sqrt{s_{NN}} = 19, 27, 39$ and $62$ GeV Au$+$Au collisions). Deviations from the Poisson baseline are considered interesting as a part of searches for enhanced fluctuations possibly resulting from the existence of a critical point in the nuclear matter phase diagram. The results are compared to previous STAR measurements of net-Proton and net-Kaon cumulants.