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Title: A dark matter search with DarkSide-50
Authors: Koh, Guangyong
Advisors: Meyers, Peter D.
Contributors: Physics Department
Keywords: Dark matter
Direct detection
Liquid argon
Subjects: Physics
Particle physics
Issue Date: 2018
Publisher: Princeton, NJ : Princeton University
Abstract: DarkSide-50 is a direct detection experiment searching for WIMP dark matter operated at Laboratori Nazionali del Gran Sasso, consisting of a dual-phase argon time projection chamber nested within an active neutron veto. The core detector is filled with a target of argon extracted from underground sources that is depleted in radioactive Argon-39. This thesis details the blind analysis of 532.4 live-days of data acquired between Aug 2015 and Oct 2017. Particular attention will be paid to the analysis of the electron recoil background, which includes: estimating the rates of radioisotope decay that are responsible; modeling the scintillation response of electron recoil events in liquid argon; and developing a cut utilizing pulse-shape discrimination to control the electron recoil background. We observe a background- and signal- free result, and report a 90% C.L. upper limit on the spin-independent WIMP-nucleon scattering cross-section of 1.1e-44 cm^2 (3.8e-44 cm^2, 3.4e-43 cm^2) for a WIMP mass of 100 GeV/c^2 (1 TeV/c^2}, 10 TeV/c^2).
Alternate format: The Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog:
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Physics

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