p-Carbon Polarimetry at RHIC

Abstract

Abstract. The polarization measurement through elastic @C) reaction plays a crucial role in the polarized proton beam operation of Relativistic Heavy Ion collider at Brookhaven National Laboratory. As well as measuring the polarization, the unknown analyzing power AN of elastic @,C) is determined as well in combination with the absolute polarization meausement by a Hjet polarimeter. The systematic uncertainty of the Run05 measurements are discussed as well as introducing the experimental apparatus of the polarimeter system.

Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarizedp+pcollisions ats=200and 62.4 GeV

“…Due to the low density of the gas jet a polarization measurement with good accuracy requires many hours of data taking. Therefore, the relative polarization is measured several times per fill with high precision by fast p þ C polarimeters for each of the two storage rings [40]. These relative measurements are then normalized using results from the jet polarimeter.…”

Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons inp+pcollisions ats=62.4 GeVAdare1, Afanasiev2, Aidala3 et al. 2012Phys. Rev. DSelf Cite7010View full textAdd to dashboardCite

“…The spin direction can be rotated into the longitudinal direction at the PHENIX interaction region using pairs of spin rotators. The polarizations of the beams at RHIC are measured every few hours by carbon target polarimeters [51], which are normalized to an absolute measurement with a hydrogen jet target polarimeter [52].…”

Understanding the J/psi Production Mechanism at PHENIX

“…Beam polarizations are measured by two independent polarimeters, a fast carbon-target polarimeter (133) for relative polarization measurements and a hydrogen-jet polarimeter (135;…”