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A Search for Wino Pair Production wi...

Schaefer, Leigh C.

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A Search for Wino Pair Production with B − L R-Parity Violating Chargino Decay to a Trilepton Resonance with the ATLAS Experiment.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A Search for Wino Pair Production with B − L R-Parity Violating Chargino Decay to a Trilepton Resonance with the ATLAS Experiment./
Author:	Schaefer, Leigh C.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	253 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-08, Section: B.
Contained By:	Dissertations Abstracts International81-08B.
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27546985
ISBN:	9781392362877

A Search for Wino Pair Production with B − L R-Parity Violating Chargino Decay to a Trilepton Resonance with the ATLAS Experiment.
Schaefer, Leigh C.

A Search for Wino Pair Production with B − L R-Parity Violating Chargino Decay to a Trilepton Resonance with the ATLAS Experiment. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 253 p.

Source: Dissertations Abstracts International, Volume: 81-08, Section: B.

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

This item is not available from ProQuest Dissertations & Theses.

This dissertation presents several searches for supersymmetric partners (superpartners) to Stan- dard Model particles. These analyses are performed using proton-proton collision data from the Large Hadron Collider (LHC) collected by the ATLAS experiment. The B − L Minimal Supersym- metric Standard Model predicts that these superpartners will have small R-parity violating couplings and the lightest superpartner will therefore decay to Standard Model particles. Two searches are presented for pair production of scalar top quarks (stops) which subsequently decay to a b-quark and a charged lepton. Limits are set as a function of the stop decay rate to each lepton flavor. The first analysis, performed with 20.3 fb−1 of √s = 8 TeV data, sets limits on the stop mass between 500 and 1000 GeV, while the second analysis, which used 36.1 fb−1 of √s = 13 TeV data, sets stop mass limits between 900 and 1500 GeV. In both analyses, the best limits are achieved for the scenario where the stop decays to a b-quark and an electron more than 95% of the time. Addition- ally, a search for charged and neutral winos (superpartners to the Standard Model gauge bosons) is presented. One possible decay of the charged wino is to a charged lepton and a Z boson. If the Z then also decays to two charged leptons, the four-vector of the three leptons reconstructs that of the charged wino. In this way, the wino search is performed via a trilepton mass resonance. This search utilizes several reconstruction techniques to have sensitivity to many different charged and neutral wino decays in addition to the trilepton resonance. Stringent limits are set on the wino mass for many possible lepton and boson branching ratios. This analysis uses 139 fb−1 of √s = 13 TeV data and it represents the first trilepton resonance result in the campaign of analyses performed with 13 TeV LHC data.

ISBN: 9781392362877Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

CERN

A Search for Wino Pair Production with B − L R-Parity Violating Chargino Decay to a Trilepton Resonance with the ATLAS Experiment.
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100 1 $a Schaefer, Leigh C. $3 3550326
245 1 0 $a A Search for Wino Pair Production with B − L R-Parity Violating Chargino Decay to a Trilepton Resonance with the ATLAS Experiment.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 253 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-08, Section: B.
500 $a Advisor: Thomson, Evelyn.
502 $a Thesis (Ph.D.)--University of Pennsylvania, 2019.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a This dissertation presents several searches for supersymmetric partners (superpartners) to Stan- dard Model particles. These analyses are performed using proton-proton collision data from the Large Hadron Collider (LHC) collected by the ATLAS experiment. The B − L Minimal Supersym- metric Standard Model predicts that these superpartners will have small R-parity violating couplings and the lightest superpartner will therefore decay to Standard Model particles. Two searches are presented for pair production of scalar top quarks (stops) which subsequently decay to a b-quark and a charged lepton. Limits are set as a function of the stop decay rate to each lepton flavor. The first analysis, performed with 20.3 fb−1 of √s = 8 TeV data, sets limits on the stop mass between 500 and 1000 GeV, while the second analysis, which used 36.1 fb−1 of √s = 13 TeV data, sets stop mass limits between 900 and 1500 GeV. In both analyses, the best limits are achieved for the scenario where the stop decays to a b-quark and an electron more than 95% of the time. Addition- ally, a search for charged and neutral winos (superpartners to the Standard Model gauge bosons) is presented. One possible decay of the charged wino is to a charged lepton and a Z boson. If the Z then also decays to two charged leptons, the four-vector of the three leptons reconstructs that of the charged wino. In this way, the wino search is performed via a trilepton mass resonance. This search utilizes several reconstruction techniques to have sensitivity to many different charged and neutral wino decays in addition to the trilepton resonance. Stringent limits are set on the wino mass for many possible lepton and boson branching ratios. This analysis uses 139 fb−1 of √s = 13 TeV data and it represents the first trilepton resonance result in the campaign of analyses performed with 13 TeV LHC data.
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650 4 $a Physics. $3 516296
650 4 $a Particle physics. $3 3433269
653 $a CERN
653 $a LHC
653 $a Stop
653 $a Supersymmetry
653 $a TRT
653 $a Wino
690 $a 0605
690 $a 0798
710 2 $a University of Pennsylvania. $b Physics and Astronomy. $3 2101621
773 0 $t Dissertations Abstracts International $g 81-08B.
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791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27546985