May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Search for the Chiral Magnetic Wave with Anisotropic Flow of Identified Particles at RHIC-STAR

May 16, 2018, 5:30 PM
20m
Sala Casinò, 1st Floor (Palazzo del Casinò)

Sala Casinò, 1st Floor

Palazzo del Casinò

Parallel Talk Chirality, vorticity and polarisation effects Chirality, vorticity and polarisation effects

Speaker

Qiye Shou (SINAP/BNL)

Description

The chiral magnetic wave (CMW) has been theorized to propagate in the Quark-Gluon Plasma formed in high-energy heavy-ion collisions. It could cause a finite electric quadrupole moment of the collision system, and may be observed by charge asymmetry, $A_{\rm ch}$, dependence of elliptic flow of positively and negatively charged hadrons. However, non-CMW mechanisms such as Local charge conservation (LCC) and hydrodynamics with isospin effect [1], could also contribute to the experimental observations.

In this talk, we present the STAR measurements of elliptic flow, $v_{2}$, and triangular flow, $v_{3}$, of charged pions, along with $v_{2}$ of charged kaons and protons, as a function of $A_{\rm ch}$ in Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 27, 39, 62.4 and 200 GeV. The similarity between pion and kaon slopes suggests that the isospin effect is not the dominant mechanism. The slope parameters of $\Delta v_{2}$($A_{\rm ch}$) and $\Delta v_{3}$($A_{\rm ch}$) are reported and compared in different centrality and transverse momentum intervals to investigate the LCC background. The difference between the normalized $\Delta v_{2}$ and $\Delta v_{3}$ slopes, along with the measurements in small systems (p+Au and d+Au at $\sqrt{s_{\rm NN}}$ = 200 GeV), will be presented. Our data favor the CMW interpretation and disfavor the possibility that the observations result from LCC or hydrodynamics at RHIC energies.

Reference
[1] Y. Hatta, A. Monnai and B.-W. Xiao, Nucl. Phys. A947, 155 (2016).

Content type Experiment
Collaboration STAR
Centralised submission by Collaboration Presenter name already specified

Primary author

Zhenyu Ye (University of Illinois at Chicago)

Presentation materials