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Title: Dark Matter Search in a Beam-Dump eXperiment (BDX) at Jefferson Lab

MeV-GeV dark matter (DM) is theoretically well motivated but remarkably unexplored. This proposal presents the MeV-GeV DM discovery potential for a $$\sim$$1 m$^3$ segmented CsI(Tl) scintillator detector placed downstream of the Hall A beam-dump at Jefferson Lab, receiving up to 10$$^{22}$$ electrons-on-target (EOT) in 285 days. This experiment (Beam-Dump eXperiment or BDX) would be sensitive to elastic DM-electron and to inelastic DM scattering at the level of 10 counts per year, reaching the limit of the neutrino irreducible background. The distinct signature of a DM interaction will be an electromagnetic shower of few hundreds of MeV, together with a reduced activity in the surrounding active veto counters. A detailed description of the DM particle $$\chi$$ production in the dump and subsequent interaction in the detector has been performed by means of Monte Carlo simulations. Different approaches have been used to evaluate the expected backgrounds: the cosmogenic background has been extrapolated from the results obtained with a prototype detector running at INFN-LNS (Italy), while the beam-related background has been evaluated by GEANT4 Monte Carlo simulations. The proposed experiment will be sensitive to large regions of DM parameter space, exceeding the discovery potential of existing and planned experiments in the MeV-GeV DM mass range by up to two orders of magnitude.
Authors:
 [1]
  1. Univ. of Genova (Italy). National Institute for Nuclear Physics. et al
Publication Date:
OSTI Identifier:
1322154
Report Number(s):
arXiv:1607.01390; FERMILAB-TM--2630-PPD
1474099; TRN: US1601895
DOE Contract Number:
AC02-07CH11359
Resource Type:
Technical Report
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
BDX Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; EXPERIMENT DESIGN; CEBAF ACCELERATOR; MONTE CARLO METHOD; MEV RANGE; GEV RANGE; NONLUMINOUS MATTER; ELECTRONS; BEAM DUMPS; COMPUTERIZED SIMULATION; SOLID SCINTILLATION DETECTORS; CESIUM IODIDES; NEUTRINOS; INTERACTIONS; PROPOSALS; ELASTIC SCATTERING; INELASTIC SCATTERING; BACKGROUND RADIATION