Building the Future: HL-LHC ATLAS Upgrades and Event-Topology-Based Principles to Search for New Physics With Missing Transverse Momentum Luis Felipe Gutierrez Zagazeta

Format:

Book

Thesis/Dissertation

Author/Creator:

Gutierrez Zagazeta, Luis Felipe, author.

Contributor:

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

Language:

English

Subjects (All):

0753.

0756.

0798.

Local Subjects:

0753.

0756.

0798.

Physical Description:

1 electronic resource (303 pages)

Contained In:

Dissertations Abstracts International 87-08B

Place of Publication:

Ann Arbor : ProQuest Dissertations and Theses, 2025

Language Note:

English

Summary:

The planned Large Hadron Collider (LHC) upgrade to the High-Luminosity (HL) LHC imposes significant challenges to the detector hardware and the need for novel analysis strategies to extend the search for new physics. This dissertation presents upgrade projects in both frontiers. In regards to the development of the ATLAS Inner Tracker Strip Detector, the design verification and validation, and probing of the Autonomous Monitoring and Control Chip (AMAC) is presented. Additionally, the radiation tolerance testing of AMAC and a commercial GaN FET are performed in a series of radiation environments. The testing of both devices are performed with device-specific electronics. In the case of GaN FET testing, a dedicated GEANT4-based simulation is developed. It is shown that the functionality of AMAC and GaN FET are minimally affected in radiation heavy environments, satisfying the operation requirements at the HL-LHC. Furthermore, the final AMAC version is projected to experience zero uncorrected single event upsets. An upper limit of 3.25×10−5 single event burnouts per fb−1 is placed for GaN FETs operated in the off-state in the forward detector region. In terms of expanding the search for new physics, novel event-topology-based tools are proposed as the bases for a foundational-model framework. These tools include transferable graph neural networks for regression and classification tasks in interaction processes that produce significant missing transverse momentum. The tools are tested on Monte Carlo simulation events prepared for a search for gluino-pair production in 140 fb−1 of proton proton collision at √ s = 13 TeV with the ATLAS detector. Direct comparison with model-specific search strategies are performed, where comparable results can be achieved in most of the mass space with major improvements in scenarios with compressed mass spectra

Notes:

Advisors: Kroll, I. Joseph; Williams, Robert I. Committee members: Heckman, Jonathan; Nelson, Philip; Rankin, Dylan; Thomson, Evelyn

Source: Dissertations Abstracts International, Volume: 87-08, Section: B.

Ph.D. University of Pennsylvania 2025

Vendor supplied data

Local Notes:

School code: 0175

ISBN:

9798276001951

Access Restriction:

Restricted for use by site license