# XX International Workshop on Deep-Inelastic Scattering and Related Subjects

26-30 March 2012
University of Bonn
Europe/Berlin timezone

## Recent STAR results and future prospects of the W boson program at RHIC at BNL

27 Mar 2012, 16:30
30m
Lecture Hall, Institute for Physical Chemistry (University of Bonn)

Spin physics

### Speaker

Prof. Bernd Surrow (MIT)

### Description

The STAR experiment at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory is carrying out a spin physics program in high-energy polarized proton collisions at $\sqrt{s}=200\,$GeV and $\sqrt{s}=500\,$GeV to gain a deeper insight into the spin structure and dynamics of the proton. The completion of the first $\sqrt{s}=500\,$GeV polarized proton run in 2009 opened a new era of spin-flavor structure measurements from $W^{-(+)}$ boson production. $W^{-(+)}$ bosons are produced in $\bar{u}+d\,(\bar{d}+u)$ collisions and can be detected through their leptonic decays, $e^{-}+\bar{\nu}_{e}\;(e^{+}+\nu_{e})$, where only the respective charged lepton is measured. The discrimination of $\bar{u}+d\;(\bar{d}+u)$ quark combinations requires distinguishing between high $p_{T}$ $e^{-(+)}$ through their opposite charge sign, which in turn requires precise tracking information. Recent published STAR results on the first measurement of $W^{-}/W^{+}$ and $Z$ boson production will be shown. The STAR experiment has recently started the installation of the Forward GEM Tracker to enhance the charge separation of high $p_{T}$ $e^{-(+)}$ at forward pseudorapidities and will begin the commissioning of this new tracking system during the upcoming 2012 running period. The status of the Forward GEM Tracker along with a discussion of future prospects will be presented.

### Primary author

Prof. Bernd Surrow (MIT)

 Slides