Reconstruction of K*$^{\mathrm{\pm }}$(892) in Au$+$Au Collisions at $\surd $s$_{\mathrm{NN}} \quad =$ 200 GeV
POSTER
Abstract
The Relativistic Heavy Ion Collider (RHIC) produces a hot, dense and deconfined Quantum ChromoDynamics (QCD) medium, called the quark-gluon plasma (QGP), with Au$+$Au collisions at $\surd $s$_{\mathrm{NN}} \quad =$ 200 GeV. The K*$^{\mathrm{\pm }}$(892) resonance is a short-lived particle with a lifetime shorter than the expected lifetime of the QGP. The K* production may provide an effective tool to probe the QGP properties, such as strangeness enhancement. Experimentally, K*$^{\mathrm{\pm }}$ analysis is difficult and less studied previously because of large combinatorial background. In recent years, improvements in data sample statistics and particle identification capability promise better K*$^{\mathrm{\pm }}$ measurements. In this presentation, we report the reconstruction of K*$^{\mathrm{\pm }}$ resonance via the hadronic decay channel K*$^{\mathrm{\pm }}$(892) $\to $K$_{\mathrm{S}}^{\mathrm{0}}\pi^{\mathrm{\pm \thinspace }}$as a function of transverse momentum (p$_{\mathrm{T}})$ up to 5 GeV/c for various collision centrality classes. The data are Au$+$Au collisions at $\surd $s$_{\mathrm{NN}} \quad =$ 200 GeV collected in the year 2011 run from the STAR experiment. Physics implications of our measurements will also be discussed.
Authors
-
He Zheng
UCLA