# Quark Matter 2017

5-11 February 2017
Hyatt Regency Chicago
America/Chicago timezone

## Collision Energy and Centrality Dependence of $\phi$-Meson Spin Alignment

Not scheduled
2h 30m
Hyatt Regency Chicago

#### Hyatt Regency Chicago

151 East Wacker Drive Chicago, Illinois, USA, 60601
Board: X05
Poster

### Speaker

Xu Sun (Central China Normal University)

### Description

Chirality is the only fundamental symmetry in the nuclear matter. The study of the vorticity and possible chiral vortical effect allows us to access this fundamental property of the hot and dense nuclear matter created in high-energy nuclear collisions, especially at the high baryon density region. Global polarization parameters of identified particles can be extracted from the azimuthal distribution of particles relative to the event plane. Recently, STAR has reported global polarization measurement of $\Lambda$-baryons ($J=1/2$).

The spin alignment of $\phi$-meson ($J=1$) could be sensitive to hadronization scenarios and possible vorticity of the colliding system. In this talk, a systematic measurement of $\phi$-meson spin alignment parameters from RHIC-STAR detector will be presented in Au+Au collisions at $\sqrt{s_{\rm{NN}}} =$19.6, 27, 39, 62.4 and 200 GeV. The beam energy and collision centrality dependence of spin alignment parameters will be discussed in association with the possible vorticity of the collision system.

Collaboration STAR Correlations and Fluctuations

### Primary author

Xu Sun (Central China Normal University)