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Study of Particle Correlation and Fluctuation From Nucleus-Nucleus Collisions to Proton-Proton Collisions With the Atlas Detector at the LHC
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Study of Particle Correlation and Fluctuation From Nucleus-Nucleus Collisions to Proton-Proton Collisions With the Atlas Detector at the LHC. |
| 개인저자 | Zhou, Mingliang. |
| 단체저자명 | State University of New York at Stony Brook. Physics. |
| 발행사항 | [S.l.]: State University of New York at Stony Brook., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 257 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-05B. Dissertation Abstract International |
| ISBN | 9781687989710 |
| 학위논문주기 | Thesis (Ph.D.)--State University of New York at Stony Brook, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Advisor: Jia, Jiangyong. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | Quark Gluon Plasma (QGP) is a novel state of nuclear matter consist of strongly-interacting quarks. This state only exists in extremely high temperature and density, and can be produced by colliding high energy nuclei. This dissertation utilized several theoretical models and collision data collected by the ATLAS detector at the LHC, to study the particle correlations in both the longitudinal and azimuthal directions.In the longitudinal direction, we proposed a new observable to study the event-by-event multiplicity fluctuation, through decomposing the multiplicity correlation in pseudorapidity into orthogonal bases. The pseudorapidity correlation function contains a significant short-range component, which is estimated and subtracted in a date-driven way. After removal of the short-range component, the multiplicity correlation was found to be dominated by a linear component, and its magnitude was found to be consistent among different collision systems at similar multiplicity. These results provide new constrains on the longitudinal density fluctuation at early stages of the heavy-ion collisions.In the transverse direction, multi-particle azimuthal cumulant technique was applied to study the event-by-event fluctuations of harmonic flow coefficient vn and correlated fluctuations between two harmonics vn and vm. To probe the properties of QGP, we compared the cumulant measurements from two collision systems with different nuclei sizes (Pb+Pb and Xe+Xe), and the results are quantitatively consistent with the hydrodynamical predictions. The influence of centrality fluctuation on the flow cumulants was also studied. This measurement was also carried out for smaller collision systems such as p+Pb and pp. Novel event selection triggers were designed to enhance the event statistics and state-of-the-art subevent algorithms were developed to suppress the non-flow background. These new results provide a handle to disentangle flow fluctuations from the initial and final stages, and also suggest that the prerequisites of QGP might also be achieved in much smaller collision systems. |
| 일반주제명 | Nuclear physics. |
| 언어 | 영어 |
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: 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
