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Electron Identification, Electronics...

Reichert, Joseph P.

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Electron Identification, Electronics Upgrades, and Electroweak Supersymmetry at ATLAS.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Electron Identification, Electronics Upgrades, and Electroweak Supersymmetry at ATLAS./
Author:	Reichert, Joseph P.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	287 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
Contained By:	Dissertations Abstracts International81-02B.
Subject:	Particle physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13806185
ISBN:	9781085565325

Electron Identification, Electronics Upgrades, and Electroweak Supersymmetry at ATLAS.
Reichert, Joseph P.

Electron Identification, Electronics Upgrades, and Electroweak Supersymmetry at ATLAS. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 287 p.

Source: Dissertations Abstracts International, Volume: 81-02, Section: B.

Thesis (Ph.D.)--University of Pennsylvania, 2019.

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

This thesis presents two searches for direct production of "electroweakinos", the supersymmetric partner particles ("superpartners") of the Standard Model photon, W, Z, and Higgs bosons. These searches were performed using 36 fb⁻¹ of √s = 13 TeV data collected by the ATLAS detector during Run 2 of the Large Hadron Collider (LHC). The first search focuses on a final state with three prompt leptons (electrons or muons) from on-shell W and Z bosons produced in decays of the electroweakinos. The second search focuses on compressed scenarios where the electroweakinos decay via off-shell W and Z bosons to pairs of leptons with small transverse momenta (pT). This second search allowed for the first exclusions of directly produced compressed Higgsinos at the LHC. In describing these searches, particular emphasis is placed on the estimation of backgrounds which mimic prompt leptons. This thesis also details the ATLAS electron identification algorithm, which distinguishes prompt electrons from backgrounds using a likelihood-based method. Significant improvements have been made to this algorithm during Run 2 including reoptimization of the selection criteria for new detector conditions, extension of the algorithm to a wider range of electron pT, and adaptation of the algorithm for the real-time selection of events. The corresponding measurements of the efficiencies for electron identification and other electron selection criteria are also described. Finally, readout electronics designed for upgrades to the ATLAS tracking system for use during the high-luminosity phase of the LHC are discussed. During this high-luminosity phase, an expected 3000 fb⁻¹ of data will be delivered to ATLAS. It is therefore essential to ensure that ATLAS will be able to efficiently operate and collect data despite the significant radiation damage it will receive. The expected performance of one readout chip ("AMAC") is demonstrated via functionality and irradiation tests of several prototypes, and good performance is observed.

ISBN: 9781085565325Subjects--Topical Terms:

3433269
Particle physics.
Subjects--Index Terms:

Electroweakinos

Electron Identification, Electronics Upgrades, and Electroweak Supersymmetry at ATLAS.
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245 1 0 $a Electron Identification, Electronics Upgrades, and Electroweak Supersymmetry at ATLAS.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 287 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-02, Section: B.
500 $a Advisor: Kroll, I. Joseph.
502 $a Thesis (Ph.D.)--University of Pennsylvania, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a This thesis presents two searches for direct production of "electroweakinos", the supersymmetric partner particles ("superpartners") of the Standard Model photon, W, Z, and Higgs bosons. These searches were performed using 36 fb⁻¹ of √s = 13 TeV data collected by the ATLAS detector during Run 2 of the Large Hadron Collider (LHC). The first search focuses on a final state with three prompt leptons (electrons or muons) from on-shell W and Z bosons produced in decays of the electroweakinos. The second search focuses on compressed scenarios where the electroweakinos decay via off-shell W and Z bosons to pairs of leptons with small transverse momenta (pT). This second search allowed for the first exclusions of directly produced compressed Higgsinos at the LHC. In describing these searches, particular emphasis is placed on the estimation of backgrounds which mimic prompt leptons. This thesis also details the ATLAS electron identification algorithm, which distinguishes prompt electrons from backgrounds using a likelihood-based method. Significant improvements have been made to this algorithm during Run 2 including reoptimization of the selection criteria for new detector conditions, extension of the algorithm to a wider range of electron pT, and adaptation of the algorithm for the real-time selection of events. The corresponding measurements of the efficiencies for electron identification and other electron selection criteria are also described. Finally, readout electronics designed for upgrades to the ATLAS tracking system for use during the high-luminosity phase of the LHC are discussed. During this high-luminosity phase, an expected 3000 fb⁻¹ of data will be delivered to ATLAS. It is therefore essential to ensure that ATLAS will be able to efficiently operate and collect data despite the significant radiation damage it will receive. The expected performance of one readout chip ("AMAC") is demonstrated via functionality and irradiation tests of several prototypes, and good performance is observed.
590 $a School code: 0175.
650 4 $a Particle physics. $3 3433269
653 $a Electroweakinos
653 $a Supersymmetric partner particles
653 $a Small transverse momenta
690 $a 0798
710 2 $a University of Pennsylvania. $b Physics and Astronomy. $3 2101621
773 0 $t Dissertations Abstracts International $g 81-02B.
790 $a 0175
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13806185