The HPS electromagnetic calorimeter

Abstract

The Heavy Photon Search experiment (HPS) is searching for a new gauge boson, the so-called "heavy photon." Through its kinetic mixing with the Standard Model photon, this particle could decay into an electron-positron pair. It would then be detectable as a narrow peak in the invariant mass spectrum of such pairs, or, depending on its lifetime, by a decay downstream of the production target. The HPS experiment is installed in Hall-B of Jefferson Lab. This article presents the design and performance of one of the two detectors of the experiment, the electromagnetic calorimeter, during the runs performed in 2015-2016. The calorimeter's main purpose is to provide a fast trigger and reduce the copious background from electromagnetic processes through matching with a tracking detector. The detector is a homogeneous calorimeter, made of 442 lead-tungstate (PbWO4) scintillating crystals, each read out by an avalanche photodiode coupled to a custom trans-impedance amplifier.

arXiv comment34 pages, 25 figures

References in corpus (6)

• Dark Sectors and New, Light, Weakly-Coupled Particles
• Dark Sectors 2016 Workshop: Community Report
• The Heavy Photon Search Test Detector
• Revisiting perturbations in extended quasidilaton massive gravity
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• Search for a Dark Photon in Electro-Produced $e^{+}{e}^{-}$ Pairs with the Heavy Photon Search Experiment at JLab
• The Heavy Photon Search beamline and its performance
• Searching for Prompt and Long-Lived Dark Photons in Electro-Produced $e^{+}{e}^{-}$ Pairs with the Heavy Photon Search Experiment at JLab