$\Lambda$($K_{S}^{0}$)-$h^{\pm}$ azimuthal correlations with respect to event plane and searches for chiral magnetic and vortical effects

20 May 2014, 09:20
20m
helium (darmstadtium)

helium

darmstadtium

Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk QCD Phase Diagram QCD phase diagram

Speaker

Feng Zhao (University of California, Los Angeles)

Description

QCD allows for the formation of parity-odd domains inside the Quark-Gluon Plasma (QGP). The proposed Chiral Magnetic Effect (CME) will lead to charge separation with respect to the reaction plane. Previous measurements from RHIC and LHC using charge-dependent two-particle azimuthal correlations with respect to the reaction plane are consistent with the expectation of charge separation from CME. However, the magnitude of the background correlation has not been understood and there is no reliable experimental approach to separate the background from a CME signal. $\Lambda$($K_{S}^{0}$)-$h^{\pm}$ azimuthal correlations are expected to provide another estimate on the intrinsic background from particle correlations. In addition, theoretical calculations of the Chiral Vortical Effect (CVE) predict a difference in baryon versus anti-baryon azimuthal correlations with respect to the reaction plane. We will present the first measurements of $\Lambda$($K_{S}^{0}$)-$h^{\pm}$ and $\Lambda$-proton azimuthal correlations with respect to the event plane from Au+Au collisions at 39~GeV and 200~GeV from STAR to investigate the CME and CVE predictions. The physics implications of our measurements will also be discussed.
On behalf of collaboration: STAR

Primary author

Feng Zhao (University of California, Los Angeles)

Presentation Materials