The interplay between strangeness and baryon number conservation in event-by-event net-particle multiplicity fluctuations in heavy-ion colls

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Date/Time:Thursday, 19 Mar 2020 from 4:10 pm to 5:00 pm
Location:Seminar is only available via BlueJeans (details below)
Channel:Nuclear Physics
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Ejiro N. Umaka, University of Houston

Note that this seminar is now only available via Bluejeans Meeting URL
Meeting ID
865 763 357

One of the fundamental goals of heavy-ion collision experiment is to map out the temperature and baryon chemical potential parameters 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, net-strangeness) are directly related to the quark number susceptibilities calculated with lattice QCD. Within the Grand Canonical Ensemble, the susceptibilities are related to event-by-event fluctuations of the number of conserved quantities. In an event-by-event net-particle fluctuation measurement, net-pion, net-proton, and net-kaon are typically used as proxies for net-charge, net-baryon, and net-strangeness respectively. The question of whether the net-kaons and net-protons fully describe the conserved quantities: net-strangeness and net-baryon number respectively, can be answered by measuring net-lambda fluctuations. Moreover, since the lambda particle contains both quantum numbers (strangeness and baryon number), its fluctuation measurement provides insight into the fluctuations of net-strangeness and net-baryon number. In this talk, the event-by-event fluctuation measurements of net-protons and net-lambdas
from STAR, as well as net-protons and net-lambdas from ALICE are discussed. Their corresponding deviations from statistical baselines in search for dynamical fluctuations, as well as their dependence on pseudorapidity to explore effects of baryon number conservation are also discussed.