자료유형  

 학위논문

Control Number  

0017160789

International Standard Book Number  

9798382807607

Dewey Decimal Classification Number  

593.7

Main Entry-Personal Name  

Kwan, Ka Yu Stephanie.

Publication, Distribution, etc. (Imprint  

[S.l.] : Princeton University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

189 p.

General Note  

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

General Note  

Advisor: Ojalvo, Isobel.

Dissertation Note  

Thesis (Ph.D.)--Princeton University, 2024.

Summary, Etc.  

요약With the discovery of the Higgs boson with mass 125 GeV at the Large Hadron Collider (LHC) in 2012, the Compact Muon Solenoid (CMS) experimental physics program has evolved to include the precise characterization of the Standard Model 125 GeV Higgs boson and searches for additional particles in an extended Higgs sector. Properties of an extended Higgs sector remain loosely constrained by current measurements, making direct searches for exotic Higgs decays a powerful probe of new physics. The decay of the 125 GeV Higgs into two light neutral scalar particles (h → aa) is allowed in extensions of the Standard Model, such as Two Higgs Doublet Models extended with a scalar singlet (2HDM+S). We present a search at CMS for exotic decays of the 125 GeV Higgs to two light neutral scalars, which decay to two bottom quarks and two tau leptons (h → aa → bbτ τ ). This analysis is combined with a similar search in a final state with two bottom quarks and two muons. The results from the bbτ τ analysis and the combined analyses are interpreted in 2HDM+S scenarios. In the Two Real Singlet Model (TRSM), the two light scalars can have unequal mass (h → a1a2). This decay has not been searched for to date at CMS. We present ongoing work on a search for h → a1a2, where the a2 decays into two a1, resulting in four bottom quarks and two tau leptons, in the µτh channel of the τ τ decay. There remain rare signatures from Standard Model and beyond-Standard Model physics that are challenging to probe with current datasets. To improve the discovery potential of the LHC, the High-Luminosity LHC (HL-LHC) is scheduled to deliver a dataset around ten times larger than the combined dataset of LHC Runs 1-3, and will increase the number of simultaneous proton-proton collisions (pile-up) by a factor of five to seven. The hardware-based CMS Level-1 (L1) Trigger will be upgraded in order to filter data in these intense pile-up conditions. This thesis also presents an L1 Trigger algorithm that will use information with higher spatial granularity to reconstruct and identify electrons and photons in the barrel calorimeter.

Subject Added Entry-Topical Term  

Particle physics.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Quantum physics.

Subject Added Entry-Topical Term  

Computational physics.

Index Term-Uncontrolled  

Compact Muon Solenoid

Index Term-Uncontrolled  

Higgs boson

Index Term-Uncontrolled  

High-energy physics

Index Term-Uncontrolled  

Large Hadron Collider

Index Term-Uncontrolled  

Higgs sector

Added Entry-Corporate Name  

Princeton University Physics

Host Item Entry  

Dissertations Abstracts International. 85-12B.

Electronic Location and Access  

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Control Number  

joongbu:653785