자료유형  

 학위논문

Control Number  

0017161103

International Standard Book Number  

9798382772011

Dewey Decimal Classification Number  

530

Main Entry-Personal Name  

Zou, Wenkai.

Publication, Distribution, etc. (Imprint  

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

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

297 p.

General Note  

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

General Note  

Advisor: Cole, Brian.

Dissertation Note  

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

Summary, Etc.  

요약Measurements of the jet substructure in Pb+Pb collisions provide information about the mechanism of jet quenching in the hot and dense QCD medium created in these collisions, over a wide range of energy scales. Recent measurements of the nuclear modification factor of large-radius jets in √ \uD835\uDC60NN = 5.02 TeV Pb+Pb collisions with ATLAS are presented. 2017 pp data of 257 pb-1 inverse picobarns and 2018 Pb+Pb data of 1.72 nb-1 inverse nanobarns are used in these measurements. The R = 1.0 large-radius jets are reconstructed with the anti-kt algorithm from R = 0.2 anti-kt jets. In each large-radius jet, the associated R = 0.2 jets, as constituents, are re-clustered using the kt algorithm to obtain the earliest splitting substructure observables, including the splitting scale √\uD835\uDC5112 and the angular separation dR12. The nuclear modification factor RAA, which is the jet yield suppression in Pb+Pb compared to pp, is measured as a function of the jet transverse momentum pT and jet substructure observables √\uD835\uDC5112 and dR12. A significant RAA decrease for jets with one single sub-jet is observed, compared to jets with more complex substructure. These results support the hypothesis that jets with hard internal splittings losemore energy propagating through the medium. Measurements of RAA with dependence on the jet substructure characterized using charged particle fragments are also presented. Utilizing jets of a consistent definition, the substructure observables, specifically the splitting scale √\uD835\uDC5112 and the angular separation dR12, are extracted from the kt re-clusterings of charged particles associated to each large-radius jet. The soft-drop grooming algorithm is applied with the kt re-clusterings of the charged particles to mitigate the strong underlying event effects. RAA is found to have a significant decrease with increasing √\uD835\uDC5112 and dR12 at their lower values, suggesting possible color coherence effects influencing the jet energy loss in the medium.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Applied physics.

Subject Added Entry-Topical Term  

Particle physics.

Index Term-Uncontrolled  

Jet quenching

Index Term-Uncontrolled  

Large-radius jet

Index Term-Uncontrolled  

Jet energy loss

Index Term-Uncontrolled  

Lead-lead collisions

Added Entry-Corporate Name  

Columbia University Physics

Host Item Entry  

Dissertations Abstracts International. 85-11B.

Electronic Location and Access  

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Control Number  

joongbu:654492