Relative Luminosity Measurement in STAR and Implications for Spin Asymmetry Determinations

摘要

The Relativistic Heavy Ion Collider (RHIC) has collided, for the first time, transversely polarized proton beams at s~(1/2) = 200 GeV. STAR has measured the relative luminosities R for different spin orientations with Beam-Beam Counters to a statistical accuracy of 10~(-3) to 10~(-4) per run. Systematic effects on R, of particular importance in preparing for future measurements of double longitudinal spin asymmetries, have been studied in detail and found to be of order 10~(-3).