The HPS electromagnetic calorimeter

Emma Buchanan

Research output: Contribution to journalArticle (Academic Journal)peer-review

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.
Original languageEnglish
Pages (from-to)89-99
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume854
Early online date22 Feb 2017
DOIs
Publication statusPublished - 11 May 2017

Keywords

  • Heavy photon; Dark photon; Electromagnetic calorimeter; Lead-tungstate crystals; Avalanche photodiodes

Fingerprint

Dive into the research topics of 'The HPS electromagnetic calorimeter'. Together they form a unique fingerprint.

Cite this