RHIC polarization for Run 13

The overview of the spin physics at RHIC-PHENIX experiment

In Spiring 2005, RHIC successfully completed its first long data collection run with polarized proton beams. PHENIX accumulated ten fold larger statistics with higher polarization than the previous spin physics run in 2003. This contribution will introduce the RHIC-PHENIX experiment and present our recent results.

Slow Orbit Feedback at Rhic*

Slow variations of the RHIC closed orbit have been strongly influenced by diurnal variations. These variations affect the reproducibility of RHIC operation and might have contributed to proton beam polarization degradation during past polarized proton runs. We have developed and commissioned a slow orbit feedback system in RHIC Run-10 to diminish these variations and improve energy ramp commiss...

2 7 Ju l 2 00 9 Quarkonia measurement in p + p and d + Au collisions at √ s = 200 GeV by PHENIX Detector

We report new quarkonia measurements necessary to understand production mechanisms and cold nuclear matter effects in the yields observed at RHIC energy. Results obtained in p+p collisions collected during the 2006 RHIC Run include J/ψ , ψ′ and Υ differential cross sections as well as J/ψ polarization. Revisited interpretations of the published J/ψ nuclear modification factors and statistically...

Analysis of Vernier Scans during RHIC Run-13 (pp at 255 GeV/beam)

Measurement of Double Helicity Asymmetry in Multi-Particle Production with Polarized Proton-Proton Collision at PHENIX

A goal of the PHENIX experiment is to obtain the polarized gluon distribution function in the proton. Double helicity asymmetry in multi-particle production with polarized proton-proton collision is measured at midrapidity with RHIC Run 2005 data. This result excludes the maximum positive gluon polarization (“GRSV-max”).