A novel search for exotic decays of the Higgs Boson with the ATLAS detector and enhancing the physics potential of the large hadron collider and atom interferometers with new techniques

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Fundamental physics research aims to understand the theory of particle interactions, the Standard Model (SM) of particle physics being the current best theory of the electroweak and strong forces. Modern efforts seeks to explain phenomenon like the matter antimatter asymmetry of the universe and the nature of dark matter using various experimental modalities such as terrestrial particle colliders like the Large Hadron Collider (LHC). The ATLAS detector on the LHC is conducting a diverse physics program of precision SM measurements and searches for Physics beyond the SM using deeply inelastic scattering products to study fundamental physics. The original research presented here uses proton collision data from the ATLAS detector to search for an exotic decay mode of the Higgs boson coupling to a new light scalar field. Additionally, two research projects are presented to improve the performance of the ATLAS detector. The first introduces a novel algorithm to improve the efficiency of locating interesting physics within saved events. The second improves the jet calibration procedure by enabling the use of gradient based regression with a novel objective function along with a unified neural network based framework. Additionally, a network of quantum sensors are in development to enhance the physics reach of modern detectors and expand the set of models of new physics that can be experimentally probed. One such technology is atomic gradiometer interferometric sensors, like the MAGIS-100 experiment, that utilize matter waves to search for ultralight bosonic dark matter. The research and development of a novel light field imaging device is presented here for the MAGIS-100 experiment, as part of a burgeoning collaboration between the high energy physics (HEP) and the atomic, molecular, and optical (AMO) physics communities.


Type of resource text
Form electronic resource; remote; computer; online resource
Extent 1 online resource.
Place California
Place [Stanford, California]
Publisher [Stanford University]
Copyright date 2022; ©2022
Publication date 2022; 2022
Issuance monographic
Language English


Author Safdari, Murtaza
Degree supervisor Schwartzman, Ariel G
Thesis advisor Schwartzman, Ariel G
Thesis advisor Burchat, P. (Patricia)
Thesis advisor Tompkins, Lauren Alexandra
Degree committee member Burchat, P. (Patricia)
Degree committee member Tompkins, Lauren Alexandra
Associated with Stanford University, Department of Physics


Genre Theses
Genre Text

Bibliographic information

Statement of responsibility Murtaza Safdari.
Note Submitted to the Department of Physics.
Thesis Thesis Ph.D. Stanford University 2022.
Location https://purl.stanford.edu/pp356hw3480

Access conditions

© 2022 by Murtaza Safdari
This work is licensed under a Creative Commons Attribution 3.0 Unported license (CC BY).

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