Measurement of the Cumulants of Conserved Charge Multiplicity Distributions in Au+Au Collisions from the STAR experiment

5 Nov 2019, 11:20
20m
Ball Room 1 (Wanda Reign Wuhan Hotel)

Ball Room 1

Wanda Reign Wuhan Hotel

Oral Presentation Search for the critical end point Parallel Session - Search for the CP I

Speaker

Ashish Pandav for the STAR Collaboration (National Institute of Science Education and Research (NISER), INDIA)

Description

Higher-order cumulants of conserved quantities (B, Q, S) are sensitive observables to study the QCD phase structures, nature of quark-hadron phase transition and freeze-out dynamics.

In this talk, we will present new measurements of sixth to second-order cumulant ratios (C6/C2) of net-proton distributions in Au+Au collisions at sNN =54.4 and 200 GeV, as well as cumulants up to the fourth-order of net-proton, net-kaon and net-charge multiplicity distributions in Au+Au collisions at sNN =27 and 54.4 GeV. The C6/C2 results are compared with a recent model calculation which predicts a negative C6/C2 value if the freeze-out occurs 10 near the chiral transition temperature. The dependence of cumulants, measured in Au+Au collisions at sNN =27 GeV, on the centrality definition was tested using the Event Plane Detector (EPD). The physics implications of the results, a detailed discussion of the background contributions and the status and prospects of phase II of the STAR Beam Energy Scan program are discussed.

Primary author

Ashish Pandav for the STAR Collaboration (National Institute of Science Education and Research (NISER), INDIA)

Presentation Materials