# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
Europe/Zurich timezone

## Dimuon Production in Au+Au √sNN = 200 GeV Collisions at STAR

20 May 2014, 16:30
2h

### spectrum

Board: G-28
Poster Electromagnetic Probes

Kefeng Xin

### Description

Dimuon production, which is sensitive to the early stage of heavy-ion collisions, provides a unique tool to study the Quark-Gluon Plasma. At low invariant mass, the dimuon mass spectrum has the contributions from many mesons, such as $\eta$, $\omega$, $\eta\prime$. At the same time, the background from $\gamma$ conversion is largely suppressed compared to the background from dielectron measurement. With the Time Projection Chamber and the Time of Flight detector together, the STAR experiment at RHIC has good muon identification at low momentum ($<$0.3 GeV/$c$) with full azimuthal coverage at mid-rapidity. We present the preliminary results of the low-mass dimuon ($<$0.65 GeV/$c^2$) distribution at mid-rapidity $|y|<1$ and compare to hadronic cocktails at Au$+$Au $\sqrt{s_{NN}} =$ 200 GeV.
On behalf of collaboration: STAR

Kefeng Xin

 Poster