Net-lambda fluctuations in Pb-Pb collisions at 5.02 TeV in ALICE at the LHC

4 Nov 2019, 17:40
20m
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation QCD at finite temperature and baryon density Poster Session

Speaker

Ejiro Naomi Umaka (University of Houston (US))

Description

One of the fundamental goals of heavy-ion collision experiment is to map out the temperature $(T_{f})$ and baryon chemical potential $(\mu_{B}^f)$ of the Quantum Chromodynamics (QCD) phase diagram at which chemical freeze-out occurs - a point on the phase diagram when the chemical composition of the system is fixed. The cumulants of conserved quantities (net-charge, net-baryon number, net-strangeness) are directly related to the quark number susceptibilities calculated with lattice QCD. In a fluctuation analysis, net-pion, net-proton, and net-kaon are typically used as proxies for net-charge, net-baryon, and net-strangeness respectively. The $\Lambda$-particle consists of a strange quark and it is as well a baryon. Hence, measuring the cumulants of net-$\Lambda$ distributions provides insight into the fluctuations of net-strangeness and net-baryon number.
In addition, the ratios of net-$\Lambda$ cumulants that are used to estimate freeze-out parameters can be compared to the ones extracted using net-proton to identify the signature of a flavor hierarchy, that is, if heavier quarks may freezeout at a different $(T_{f})$ and $(\mu_{B}^f)$ from lighter quarks.
In this poster, we will present the measurement of the first and second order cumulants of net-$\Lambda$ distributions in Pb-Pb collisions at $\sqrt{s_{NN}}$= 5.02 TeV using the ALICE detector.

Primary author

Ejiro Naomi Umaka (University of Houston (US))

Presentation Materials

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