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

Recent Results of Double Helicity Asymmetries at PHENIX

27 Mar 2012, 09:35
25m
Lecture Hall, Institute for Physical Chemistry (University of Bonn)

Lecture Hall, Institute for Physical Chemistry

University of Bonn

Spin physics Spin physics

Speaker

Mr Scott Wolin (University of Illinois at Urbana-Champaign)

Description

The determination of the gluon polarization within the proton, $\Delta G$, is one of the critical pieces to understanding the proton spin puzzle. Using collisions of polarized protons with $\sqrt{s}=200 \:GeV$ and $\sqrt{s}=500 \:GeV$ at the Relativistic Heavy Ion Collider (RHIC), PHENIX can access gluons and $\Delta G$ at leading order. Constraints on $\Delta G$ come from measurements of double longitudinal asymmetries, $A_{LL}$, of various particle production cross sections. We will present the recent $A_{LL}$ results at central $(|{\eta}|<0.35)$ and forward $(3.1 < |{\eta}| < 3.9)$ rapidities along with comparisons to various models of the gluon polarization. A summary of the current issues limiting the precision of these measurements will follow. Finally, we will discuss the possibilities in the near to mid-term future of the PHENIX $\Delta G$ program, specifically, constraining $\Delta G$ at low-x.

Primary author

Mr Scott Wolin (University of Illinois at Urbana-Champaign)

Presentation materials