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
Lecture Hall, Institute for Physical Chemistry (University of Bonn)

Lecture Hall, Institute for Physical Chemistry

University of Bonn

Spin physics Spin physics


Prof. Bernd Surrow (MIT)


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)

Presentation materials