APEX: An electron fixed-target experiment to search for a new vector boson A′ Decaying to e{sup +}e{sup −}

Journal Article · Thu Nov 07 00:00:00 EST 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4829397· OSTI ID:22280668

Schuster, Philip ^[1]

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1. Perimeter Institute for Theoretical Physics Ontario (Canada)

The A' EXperiment (APEX) is designed to search for new vector bosons that have small couplings to charged particles. Such vectors can arise naturally from a small kinetic mixing of a new 'dark photon' (A') with the photon - one of the very few ways in which new forces can couple to the Standard Model - and have received considerable attention as an explanation of various dark matter related anomalies. A' bosons are produced by radiation off an electron beam, and could appear as narrow resonances with small production cross-section in the QED e{sup +}e{sup −} spectrum. We plan to search for an A' using the CEBAF electron beam at energies of 1-4 GeV incident on 0.5-10% radiation length multi-foil tungsten targets, and measure the resulting e{sup +}e{sup −} pairs using the High Resolution Spectrometers and a septum magnet in Hall A at Jefferson Lab. With a 33-day run, APEX will explore the region 50 MeV < m{sub A′} < 550 MeV with couplings alpha'/alpha down to 10{sup −7}. This proceeding summarizes the experiment, test run results, and comments on future plans.

• OSTI ID: 22280668
• Journal Information: AIP Conference Proceedings, Vol. 1563, Issue 1; Conference: Workshop to explore physics opportunities with intense, polarized electron beams at 50-300 MeV, Cambridge, MA (United States), 14-16 Mar 2013; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CEBAF ACCELERATOR
CHARGED PARTICLES
CROSS SECTIONS
ELECTRON BEAMS
ELECTRONS
GEV RANGE
INTERMEDIATE VECTOR BOSONS
MEV RANGE
NONLUMINOUS MATTER
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PHOTONS
POSITRONS
QUANTUM ELECTRODYNAMICS
RADIATION LENGTH
SEPTUM MAGNETS
STANDARD MODEL