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ABSOLUTE POLARIMETRY AT RHIC [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Brookhaven National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Precise and absolute beam polarization measurements are critical for the RHIC spin physics program. Because all experimental spin-dependent results are normalized by beam polarization, the normalization uncertainty contributes directly to final physics uncertainties. We aimed to perform the beam polarization measurement to an accuracy Of ΔP{sub beam}/P{sub beam} < 5%. The absolute polarimeter consists of Polarized Atomic Hydrogen Gas Jet Target and left-right pairs of silicon strip detectors and was installed in the RHIC-ring in 2004. This system features proton-proton elastic scattering in the Coulomb nuclear interference (CNI) region. Precise measurements of the analyzing power A{sub N} of this process has allowed us to achieve ΔP{sub beam}/P{sub beam} = 4.2% in 2005 for the first long spin-physics run. In this report, we describe the entire set up and performance of the system. The procedure of beam polarization measurement and analysis results from 2004-2005 are described. Physics topics of AN in the CNI region (four-momentum transfer squared 0.001 < -t < 0.032 (GeV/c)²) are also discussed. We point out the current issues and expected optimum accuracy in 2006 and the future.
Report Numbers
E 1.99:bnl--79633-2007-cp
bnl--79633-2007-cp
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Note
Published through SciTech Connect.
09/10/2007.
"bnl--79633-2007-cp"
"KB-02-02-022"
XIITH INTERNATIONAL WORKSHOP ON POLARIZED SOURCES, TARGETS AND POLARIMETRY (PSTP07).; BROOKHAVEN NATIONAL LABORATORY, UPTON, NEW YORK; 20070910 through 20070914.
WOOD, J.; ET AL.; GILL, R.; HUANG, H.; BUNCE, G.; BRAVAR, A.; MAKDISI, Y.; SS, A.; OKADA; ZELENSKI, Z.
Funding Information
DE-AC02-98CH10886
08840
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