Investigating correlated fluctuations of conserved charges with net-$\Lambda$ fluctuations in Pb-Pb collisions at ALICE

Abstract

Event-by-event fluctuations of conserved charges - such as electric charge, strangeness, and baryon number - in ultrarelativistic heavy-ion collisions provide insight into the properties of the quark-gluon plasma and the QCD phase diagram. They can be related to the higher moments of the multiplicity distributions of identified particles, such as the $\Lambda$ baryon which carries both strangeness and baryon number and is thus of particular interest. We present the first measurement of net-$\Lambda$ fluctuations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV as a function of centrality and the pseudorapidity acceptance of the measurement. The results are compared to expectations of the effects of global baryon number conservation as well as to predictions from the HIJING Monte Carlo event generator. In this analysis the Identity Method is applied in a novel way to account for the combinatoric background in the invariant mass distribution.

arXiv commentProceedings of the XXVIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018), May 2018

References in corpus (9)

• Bridging the gap between event-by-event fluctuation measurements and theory predictions in relativistic nuclear collisions
• Identity Method for the Determination of the Moments of Multiplicity Distributions
• Net-baryon fluctuations measured with ALICE at the CERN LHC
• Identity method to study chemical fluctuations in relativistic heavy-ion collisions
• Identity Method for Particle Number Fluctuations and Correlations
• Relative particle yield fluctuations in Pb-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=2.76$ TeV
• Event-by-Event Identified Particle Ratio Fluctuations in Pb-Pb Collisions with ALICE using the Identity Method
• Higher moment fluctuations of identified particle distributions from ALICE
• Identity Method Revisited

Cited by in corpus (4)

• Particlization of an interacting hadron resonance gas with global conservation laws for event-by-event fluctuations in heavy-ion collisions
• Dynamics of critical fluctuations: Theory -- phenomenology -- heavy-ion collisions
• Purity correction for cumulants of hyperon number distribution
• Particle-Set Identification method to study multiplicity fluctuations