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

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

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Search for the critical end point Poster Session

Speaker

Jin Wu (Central China Normal University)

Description

One of the main goals of RHIC beam energy scan program is to search for the signature of the QCD critical point in heavy-ion collisions. It is predicted that the local density fluctuations near critical point exhibit power-law scaling, which can be probed with a intermittency analysis of the scaled factorial moments ($F_{q}$) for charged particles. The power-law behavior of $q^{th}$ order scaled factorial moments can be expressed as: $F_{q}\sim (M^{2})^{\phi_{q}}$, where $M^{2}$ is the number of equally sized cells in momentum space, and $\phi_{q}$ is the intermittency index. The scaling exponent, $\nu$, related to the critical component can be derived from the ratio, $\phi_{q}/\phi_{2}$. The energy dependence of $\nu$ could be used to search for the signature of the QCD critical point. Such measurement is actively being pursued by the NA49 and NA61 Collaborations in large and small collisions at $\sqrt{s_{NN}}=17.3$ GeV. The BES-I data allow STAR to carry out such measurement over a much broader energy range of$\sqrt{s_{NN}}=7.7-200$ GeV. This poster present the collision-energy and centrality dependence of $\phi_{q}$ and $\nu$ of charged particles in Au+Au collisions measured by the STAR experiment. The physical implications of these results are discussed.

Primary author

Jin Wu (Central China Normal University)

Presentation Materials