Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre13002c&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
An Endcap Electromagnetic Calorimeter (EEMC) for the STAR detector at RHIC is presently under construction and will be installed in STAR during shutdowns in 2002 and 2003. The calorimeter is designed to measure the gluon contribution to the proton's spin through the double-spin asymmetries in the partonic process q g arrow q γ . To isolate this process, direct photons must be distinguished from the decays of π^0 arrow γ γ and η arrow γ γ . In the EEMC, the showers of the two photons from these decay processes will often overlap, and a highly-segmented shower-maximum detector (SMD) will be needed to separate photon pairs from direct photons. The SMD is being built with triangular scintillator strips using wavelength-shifting optical fiber readout. The design, calibration, and early performance measurements of the SMD will be discussed in this paper.
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