The PHENIX Hadron Blind Detector

Dielectron measurements by the PHENIX Experiment at RHIC are limited by the combinatorial background from electrons and positrons which are not produced in the same pair. The Hadron Blind Detector will allow a substantial reduction of this background by correctly identifying dielectrons from photon...

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Bibliographic Details
Main Author: Durham, J M
Format: Conference Proceeding
Language:English
Subjects:
BROOKHAVEN RHIC
CARBON TETRAFLUORIDE
CESIUM IODIDES
CHERENKOV COUNTERS
ELECTRON MULTIPLIERS
ELECTRONS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PHOTOCATHODES
PHOTOELECTRON SPECTROSCOPY
PIONS
POSITRONS
QUANTUM EFFICIENCY
RADIATORS
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Summary:Dielectron measurements by the PHENIX Experiment at RHIC are limited by the combinatorial background from electrons and positrons which are not produced in the same pair. The Hadron Blind Detector will allow a substantial reduction of this background by correctly identifying dielectrons from photon conversions and pion Dalitz decays which dominate the signal in the low mass region of the spectrum. Triple GEM stacks, with a CsI photocathode deposited on the uppermost GEM, detect Cherenkov light produced by electrons in a CF4 radiator. The transparency of CF4, high quantum efficiency of CsI in the UV, and absence of a window between the gas radiator and the GEMs allow a large photoelectron yield, while minimizing the hadron signal. Results from the HBD in RHIC's Run-7 and preparations for upcoming runs are discussed.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3120145