12–16 Jul 2021
Europe/Zurich timezone
Due to the COVID-19 coronavirus pandemic, the ISMD2021 meeting has been moved online. We look forward to welcoming you in the Scottish Highlands next summer.

Measurement of Intermittency for Charged Particles in Au + Au Collisions at $\sqrt{s_{NN}}=7.7-200$ GeV from STAR

16 Jul 2021, 14:30
20m

Speaker

Jin Wu (Central China Normal University)

Description

One of the main goals of RHIC beam energy scan (BES) program is to search for the signatures of QCD critical point in heavy-ion collisions. It is predicted that the local density fluctuations near the critical point exhibit power-law scaling, which can be probed with an intermittency analysis of the scaled factorial moments, $F_{q}(M)$, for charged particles. The power-law behavior of $q^{th}$ order scaled factorial moments can be expressed as: $F_{q}(M)\sim F_{2}(M)^{\beta_{q}}$, where $M$ is the number of equally sized cells in one dimension of momentum space, and $\beta_{q}$ is the intermittency exponent. The scaling exponent, $\nu$, related to the critical component can be derived from the equation: $\beta_{q}\sim (q-1)^{\nu}$. The energy dependence of $\nu$ could be used to search for the signature of the QCD critical point. Similar measurements have been carried out by NA49 and NA61 experiments in heavy-ion collisions with different system sizes.

In this talk, we will present the scaled factorial moments ($F_{q}(M)$, up to sixth order) of charged particles in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7 - 200 GeV measured by STAR experiment in the first phase of RHIC BES. Then, we will show the energy and centrality dependence of the extracted $\nu$ values. The physical implications of these results will be discussed.

Preferred track High-temperature QCD

Author

Jin Wu (Central China Normal University)

Presentation materials