Continuing the search for nothing : invisible Higgs boson decays and high luminosity upgrades at the atlas detector / Benjamin John Rosser.

Format:

Book

Thesis/Dissertation

Author/Creator:

Rosser, Benjamin John, author.

Contributor:

Lipeles, Elliot, degree supervisor.

University of Pennsylvania. Department of Physics and Astronomy, degree granting institution.

Language:

English

Subjects (All):

Particle physics.

Physics and Astronomy--Penn dissertations.

Penn dissertations--Physics and Astronomy.

Local Subjects:

Particle physics.

Physics and Astronomy--Penn dissertations.

Penn dissertations--Physics and Astronomy.

Physical Description:

1 online resource (335 pages)

Contained In:

Dissertations Abstracts International 83-08B.

Place of Publication:

[Philadelphia, Pennsylvania] : University of Pennsylvania ; Ann Arbor : ProQuest Dissertations & Theses, 2021.

Language Note:

English

System Details:

Mode of access: World Wide Web.

Summary:

This thesis presents two main projects involving the ATLAS experiment at the Large Hadron Collider: a search for invisible decays of the Higgs boson produced via vector boson fusion, and the design and simulation of an application specific integrated circuit produced for the Inner Tracker Strip detector upgrade project, the Hybrid Controller Chip (HCCStar). The HCCStar will be installed in the ATLAS detector around 2026 for High Luminosity LHC operations, which will see the rate of collisions increased to 200 every 25 ns. Verification of the HCCStar design was performed using cocotb, a Python framework for testing digital logic. The search for invisible Higgs decays was conducted using 139 fb-1 of recorded proton-proton collision data with a center-of-mass energy of √s = 13 TeV collected between 2015 and 2018. Observed (expected) upper limits were set on the branching ratio of the Higgs boson to an all-invisible final state at \uD835\uDCD1H → inv. = 0.15 (0.11) at a 95% confidence level. No significant disagreement from the Standard Model, which predicts \uD835\uDCD1H → inv. ∼ 1.0 x 10-3, was observed. This result is then reinterpreted in the context of Higgs portal dark matter and compared to various direct detection experiments searching for evidence of weakly interacting massive particles (WIMPs).

Notes:

Source: Dissertations Abstracts International, Volume: 83-08, Section: B.

Advisors: Lipeles, Elliot; Committee members: Kroll, Joseph; Klein, Josh; Jain, Bhuvnesh; Heckman, Jonathan.

Department: Physics and Astronomy.

Ph.D. University of Pennsylvania 2021.

Local Notes:

School code: 0175

ISBN:

9798780657736

Access Restriction:

Restricted for use by site license.

This item must not be sold to any third party vendors.