Run-09 pC polarimeter analysis

Alekseev, I. ; Aschenauer, E. ; Atoyan, G. ; Bazilevsky, A. ; Gill, R. ; Huang, H. ; Lee, S. ; Li, X. ; Makdisi, Y. ; Morozov, B. ; Nakagawa, I. ; Svirida, D. ; Zelenski, A.

Brookhaven National Laboratory

关键词: Asymmetry;    43 Particle Accelerators;    Targets;    Polarization;    Polarimeters;   

DOI  :  10.2172/988808
RP-ID  :  BNL--93914-2010-IR
RP-ID  :  DE-AC02-98CH10886
RP-ID  :  988808

美国|英语

来源: UNT Digital Library

【 摘 要 】

Analysis of PC polarimeter data at {radical}s = 200 and 500 GeV from Run9 is presented. Final polarization results, fill-by-fill, for blue and yellow beams, as to be used by RHIC experiments (in collisions) are released and collected in http://www4.rcf.bnl.gov/cnipol/pubdocs/Run09Offline/. Global relative systematic uncertainties {delta}P/P (to be considered as correlated from fill to fill) are 4.7% for 100 GeV beams, and 8.3% (12.1%) for blue (yellow) 250 GeV beams. For a product of two beam polarizations P{sub B} {center_dot} P{sub Y} (used in double spin asymmetry measurements) the relative uncertainty {delta}(P{sub B} {center_dot} P{sub Y})/(P{sub B} {center_dot} P{sub Y}) 8.8% for 100 GeV beams and 18.5% for 250 GeV beams. For the average between two beam polarization (P{sub B} + P{sub Y})/2 (used in single spin asymmetry measurements, when data from two polarized beams are combined) the relative uncertainty is 4.4% for 100 GeV beams and 9.2% for 250 GeV beams. Larger uncertainties for 250 GeV beams relate to significant rate related systematic effects experienced in the first part of Run9 (due to thicker targets used and smaller trans. beam size at higher beam energy).