Search for displaced leptons in the ATLAS detector / Lesya Horyn.

Format:

Book

Author/Creator:

Horyn, Lesya.

Series:

Springer theses

Language:

English

Subjects (All):

Leptons (Nuclear physics).

Fermions.

Genre:

Electronic books.

Physical Description:

1 online resource.

Place of Publication:

Cham, Switzerland : Springer, 2022.

Summary:

This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).

Contents:

Part 1: Introduction and Motivation

Chapter 1: Introduction

Chapter 2: Theory

Part 2: The Experiment

Chapter 3: The Large Hadron Collider

Chapter 4: The ATLAS detector

Chapter 5: Object Reconstruction

Chapter 6: Data and Monte Carlo Samples

Part 3: Long Lived Particle Context

Chapter 7: Searching for Long Lived Particles

Chapter 8: Experimental Context

Part 4: Search for Displaced Leptons

Chapter 9: Event Selection

Chapter 10: Backgrounds

Chapter 11: Signal Systematics

Part 5: Results

Chapter 12: Results

Chapter 13: Interpretation

Chapter 14: Conclusions and Future Improvements.

Notes:

"Doctoral Thesis accepted by the University of Chicago, USA."

Includes bibliographical references.

Online resource; title from PDF title page (SpringerLink, viewed February 23, 2022).

ISBN:

9783030916725

3030916723

OCLC:

1296086201

Access Restriction:

Restricted for use by site license.