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Measurements on the Production of a Z Boson in Association with a Photon in Proton-Proton Collisions and a Search for Anomalous Neutral Triple Gauge Couplings at the CERN Large Hadron Collider- [electronic resource]
Measurements on the Production of a Z Boson in Association with a Photon in Proton-Proton Collisions and a Search for Anomalous Neutral Triple Gauge Couplings at the CERN Large Hadron Collider- [electronic resource]
상세정보
- 자료유형
- 학위논문
- Control Number
- 0016934239
- International Standard Book Number
- 9798380120708
- Dewey Decimal Classification Number
- 593.7
- Main Entry-Personal Name
- Wadud, Mohammad Abrar.
- Publication, Distribution, etc. (Imprint
- [S.l.] : University of Minnesota., 2023
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- Physical Description
- 1 online resource(154 p.)
- General Note
- Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
- General Note
- Advisor: Rusack, Roger.
- Dissertation Note
- Thesis (Ph.D.)--University of Minnesota, 2023.
- Restrictions on Access Note
- This item must not be sold to any third party vendors.
- Summary, Etc.
- 요약Within the framework of the Standard Model of particle physics, p-p collisions produce the final state of a photon and missing momentum from a Z boson solely through quark exchange in the t and u channels, since direct couplings between the neutral electroweak bosons Z and γ are not permitted at the tree level. However, the presence of new physics can induce the couplings Z Z γ and Z γ γ, and enable the s channel, resulting in an enhancement in the rate of production. This enhancement would be particularly pronounced at the high-energy tail of the photon transverse momentum distribution. In this thesis, I present a search for these anomalous neutral triple gauge couplings (aNTGCs) under an effective vertex model and a measurement of the crosssection of the process pp → Z(→ νν) + γ. The analysis is based on data collected by the CMS detector at the LHC between 2016 and 2018 at a center of mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb−1 . Moreover, two machinelearning techniques are introduced to enhance the sensitivity of the search. The first is an identification method designed specifically for photons with transverse momentum exceeding 200 GeV. The second is a tagger that suppresses background photons at high pseudorapidities of the detector that originate from Bremsstrahlung radiation emitted by muons within a diffuse halo produced by interactions of the proton beams with the beampipe material. The photon identification method improves the signal selection efficiency by 12% compared to a cut-based approach, while the beam halo tagger extends the pseudorapidity coverage of the photons in the search, allowing for the inclusion of photons in the CMS endcaps that were previously dominated by beam halo background. From the analysis of the distribution of the photon transverse momentum, limits on the strengths of the aNTGCs have been measured.
- Subject Added Entry-Topical Term
- Particle physics.
- Subject Added Entry-Topical Term
- Applied physics.
- Subject Added Entry-Topical Term
- Electrical engineering.
- Index Term-Uncontrolled
- Anomalous couplings
- Index Term-Uncontrolled
- Standard model
- Index Term-Uncontrolled
- Monophoton
- Index Term-Uncontrolled
- Photons
- Index Term-Uncontrolled
- Transverse momentum
- Added Entry-Corporate Name
- University of Minnesota Physics
- Host Item Entry
- Dissertations Abstracts International. 85-02B.
- Host Item Entry
- Dissertation Abstract International
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:642811
MARC
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■1001 ▼aWadud, Mohammad Abrar.
■24510▼aMeasurements on the Production of a Z Boson in Association with a Photon in Proton-Proton Collisions and a Search for Anomalous Neutral Triple Gauge Couplings at the CERN Large Hadron Collider▼h[electronic resource]
■260 ▼a[S.l.]▼bUniversity of Minnesota. ▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a1 online resource(154 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-02, Section: B.
■500 ▼aAdvisor: Rusack, Roger.
■5021 ▼aThesis (Ph.D.)--University of Minnesota, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aWithin the framework of the Standard Model of particle physics, p-p collisions produce the final state of a photon and missing momentum from a Z boson solely through quark exchange in the t and u channels, since direct couplings between the neutral electroweak bosons Z and γ are not permitted at the tree level. However, the presence of new physics can induce the couplings Z Z γ and Z γ γ, and enable the s channel, resulting in an enhancement in the rate of production. This enhancement would be particularly pronounced at the high-energy tail of the photon transverse momentum distribution. In this thesis, I present a search for these anomalous neutral triple gauge couplings (aNTGCs) under an effective vertex model and a measurement of the crosssection of the process pp → Z(→ νν) + γ. The analysis is based on data collected by the CMS detector at the LHC between 2016 and 2018 at a center of mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb−1 . Moreover, two machinelearning techniques are introduced to enhance the sensitivity of the search. The first is an identification method designed specifically for photons with transverse momentum exceeding 200 GeV. The second is a tagger that suppresses background photons at high pseudorapidities of the detector that originate from Bremsstrahlung radiation emitted by muons within a diffuse halo produced by interactions of the proton beams with the beampipe material. The photon identification method improves the signal selection efficiency by 12% compared to a cut-based approach, while the beam halo tagger extends the pseudorapidity coverage of the photons in the search, allowing for the inclusion of photons in the CMS endcaps that were previously dominated by beam halo background. From the analysis of the distribution of the photon transverse momentum, limits on the strengths of the aNTGCs have been measured.
■590 ▼aSchool code: 0130.
■650 4▼aParticle physics.
■650 4▼aApplied physics.
■650 4▼aElectrical engineering.
■653 ▼aAnomalous couplings
■653 ▼aStandard model
■653 ▼aMonophoton
■653 ▼aPhotons
■653 ▼aTransverse momentum
■690 ▼a0798
■690 ▼a0215
■690 ▼a0544
■71020▼aUniversity of Minnesota▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-02B.
■773 ▼tDissertation Abstract International
■790 ▼a0130
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934239▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
