자료유형  

 학위논문

Control Number  

0017164045

International Standard Book Number  

9798384078739

Dewey Decimal Classification Number  

593.7

Main Entry-Personal Name  

Lam, Tyler Christopher.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of California, Los Angeles., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

189 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

General Note  

Advisor: Bachtis, Michalis.

Dissertation Note  

Thesis (Ph.D.Physics.)--University of California, Los Angeles, 2024.

Summary, Etc.  

요약This thesis describes the search for rare Standard Model (SM) Higgs boson decays to longlived scalar bosons (Φ) decaying to photon pairs using data collected by the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider. The data were collected from 2016, 2017, and 2018 proton-proton collisions at center-of-mass energy of √s = 13 TeV and correspond to an integrated luminosity of 138 fb−1 . Events are triggered using the leptonic decays of the Z boson produced in association with the SM Higgs boson. Although the CMS electromagnetic calorimeter has limited vertex reconstruction capabilities for photons, this analysis utilizes a novel reconstruction technique using kinematic constraints to calculate the displaced vertices of the diphotons. Signal is extracted using a counting-based maximumlikelihood approach in bins of the diphoton vertex Lxy and the invariant photon mass. Results are interpreted in terms of upper limits on branching ratios BR(H → ΦΦ) x BR(Φ → γ γ ) and in terms of the model-independent production cross section σ(Z + ΦΦ) x BR(Φ → γ γ ). No significant excess above SM expectation is observed.

Subject Added Entry-Topical Term  

Particle physics.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Quantum physics.

Index Term-Uncontrolled  

Axion

Index Term-Uncontrolled  

Standard Model

Index Term-Uncontrolled  

Compact Muon Solenoid

Index Term-Uncontrolled  

Higgs boson

Index Term-Uncontrolled  

Large Hadron Collider

Index Term-Uncontrolled  

Photons

Added Entry-Corporate Name  

University of California, Los Angeles Physics 0666

Host Item Entry  

Dissertations Abstracts International. 86-03B.

Electronic Location and Access  

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Control Number  

joongbu:654409