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Collectivity in Large and Small Collision Systems: Flow in Xe+Xe Collisions and Sensitivity to the Presence of Hard Scatterings in \uD835\uDC5D \uD835\uDC5D Collisions- [electronic resource]
Collectivity in Large and Small Collision Systems: Flow in Xe+Xe Collisions and Sensitivity to the Presence of Hard Scatterings in \uD835\uDC5D \uD835\uDC5D Collisions- [electronic resource]
상세정보
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101917
- ISBN
- 9798380591027
- DDC
- 530
- 저자명
- Yin, Pengqi.
- 서명/저자
- Collectivity in Large and Small Collision Systems: Flow in Xe+Xe Collisions and Sensitivity to the Presence of Hard Scatterings in \uD835\uDC5D \uD835\uDC5D Collisions - [electronic resource]
- 발행사항
- [S.l.]: : Columbia University., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(202 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
- 주기사항
- Advisor: Cole, Brian.
- 학위논문주기
- Thesis (Ph.D.)--Columbia University, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약The Quark-Gluon Plasma (QGP) produced in heavy-ion collisions has been shown to behave like a nearly perfect fluid, characterized by a very low ratio of shear viscosity to entropy density. Significant measurements in large collision systems have improved the constraints on the value of \uD835\uDF02/\uD835\uDC60. However, the precise temperature dependence of \uD835\uDF02/\uD835\uDC60 still remains unknown. The interplay between viscous effects and initial geometry fluctuations is important that requires further investigation. Another key open question in the study of multi-particle production is the relationship between the "ridge" - observed azimuthal correlations between particles in the underlying event that extend over all rapidities - and hard or semi-hard scattering processes in small collision systems. In particular, it is not known whether jets or their soft fragments are correlated with particles in the underlying event.This dissertation presents two analyses. The first analysis measures flow harmonics \uD835\uDC632-\uD835\uDC636 in 3 \uD835\uDF07b −1 of Xe+Xe collisions at √ \uD835\uDC60NN = 5.44 TeV using the ATLAS detector at the LHC. The centrality, multiplicity, and \uD835\uDC5DT dependence of the \uD835\uDC63\uD835\uDC5B values obtained using two-particle correlations and template-fit procedure are presented, and the measurements are compared with those in Pb+Pb collisions and \uD835\uDC5D+Pb collisions at √ \uD835\uDC60NN = 5.02 TeV. The \uD835\uDC63\uD835\uDC5B values in Xe+Xe collisions are observed to be larger than those in Pb+Pb collisions for \uD835\uDC5B = 2, 3, and 4 in the most central events. However, the \uD835\uDC63\uD835\uDC5B values in Xe+Xe collisions become smaller than those in Pb+Pb collisions with decreasing centrality or increasing harmonic order \uD835\uDC5B. The \uD835\uDC63\uD835\uDC5B in Xe+Xe and Pb+Pb collisions are also compared as a function of the mean number of participating nucleons and the measured charged-particle multiplicity in the detector. The \uD835\uDC633 values in Xe+Xe and Pb+Pb collisions are observed to be similar at the same ⟨\uD835\uDC41part⟩ or multiplicity, but the other harmonics are significantly different.The second analysis studies two-particle correlations in \uD835\uDC5D \uD835\uDC5D collisions at √ \uD835\uDC60 = 13 TeV using data collected by the ATLAS experiment at the LHC, with an integrated luminosity of 15.8 pb−1 , in two different configurations. In the first case, charged particles associated with jets are excluded from the correlation analysis, while in the second case, correlations are measured between particles within jets and charged particles from the underlying event. Second-order flow coefficients, \uD835\uDC632, are presented as a function of event multiplicity and transverse momentum. These measurements show that excluding particles associated with jets does not affect the measured correlations. Moreover, particles associated with jets do not exhibit any significant azimuthal correlations with the underlying event, ruling out hard processes contributing to the ridge.
- 일반주제명
- Physics.
- 일반주제명
- Quantum physics.
- 일반주제명
- Atomic physics.
- 키워드
- Flow
- 키워드
- Heavy ion
- 기타저자
- Columbia University Physics
- 기본자료저록
- Dissertations Abstracts International. 85-04B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008240612s2023 us |||||||||||||||c||eng d■001000016935312
■00520240214101917
■006m o d
■007cr#unu||||||||
■020 ▼a9798380591027
■035 ▼a(MiAaPQ)AAI30688589
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aYin, Pengqi.
■24510▼aCollectivity in Large and Small Collision Systems: Flow in Xe+Xe Collisions and Sensitivity to the Presence of Hard Scatterings in \uD835\uDC5D \uD835\uDC5D Collisions▼h[electronic resource]
■260 ▼a[S.l.]:▼bColumbia University. ▼c2023
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2023
■300 ▼a1 online resource(202 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-04, Section: B.
■500 ▼aAdvisor: Cole, Brian.
■5021 ▼aThesis (Ph.D.)--Columbia University, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aThe Quark-Gluon Plasma (QGP) produced in heavy-ion collisions has been shown to behave like a nearly perfect fluid, characterized by a very low ratio of shear viscosity to entropy density. Significant measurements in large collision systems have improved the constraints on the value of \uD835\uDF02/\uD835\uDC60. However, the precise temperature dependence of \uD835\uDF02/\uD835\uDC60 still remains unknown. The interplay between viscous effects and initial geometry fluctuations is important that requires further investigation. Another key open question in the study of multi-particle production is the relationship between the "ridge" - observed azimuthal correlations between particles in the underlying event that extend over all rapidities - and hard or semi-hard scattering processes in small collision systems. In particular, it is not known whether jets or their soft fragments are correlated with particles in the underlying event.This dissertation presents two analyses. The first analysis measures flow harmonics \uD835\uDC632-\uD835\uDC636 in 3 \uD835\uDF07b −1 of Xe+Xe collisions at √ \uD835\uDC60NN = 5.44 TeV using the ATLAS detector at the LHC. The centrality, multiplicity, and \uD835\uDC5DT dependence of the \uD835\uDC63\uD835\uDC5B values obtained using two-particle correlations and template-fit procedure are presented, and the measurements are compared with those in Pb+Pb collisions and \uD835\uDC5D+Pb collisions at √ \uD835\uDC60NN = 5.02 TeV. The \uD835\uDC63\uD835\uDC5B values in Xe+Xe collisions are observed to be larger than those in Pb+Pb collisions for \uD835\uDC5B = 2, 3, and 4 in the most central events. However, the \uD835\uDC63\uD835\uDC5B values in Xe+Xe collisions become smaller than those in Pb+Pb collisions with decreasing centrality or increasing harmonic order \uD835\uDC5B. The \uD835\uDC63\uD835\uDC5B in Xe+Xe and Pb+Pb collisions are also compared as a function of the mean number of participating nucleons and the measured charged-particle multiplicity in the detector. The \uD835\uDC633 values in Xe+Xe and Pb+Pb collisions are observed to be similar at the same ⟨\uD835\uDC41part⟩ or multiplicity, but the other harmonics are significantly different.The second analysis studies two-particle correlations in \uD835\uDC5D \uD835\uDC5D collisions at √ \uD835\uDC60 = 13 TeV using data collected by the ATLAS experiment at the LHC, with an integrated luminosity of 15.8 pb−1 , in two different configurations. In the first case, charged particles associated with jets are excluded from the correlation analysis, while in the second case, correlations are measured between particles within jets and charged particles from the underlying event. Second-order flow coefficients, \uD835\uDC632, are presented as a function of event multiplicity and transverse momentum. These measurements show that excluding particles associated with jets does not affect the measured correlations. Moreover, particles associated with jets do not exhibit any significant azimuthal correlations with the underlying event, ruling out hard processes contributing to the ridge.
■590 ▼aSchool code: 0054.
■650 4▼aPhysics.
■650 4▼aQuantum physics.
■650 4▼aAtomic physics.
■653 ▼aFlow
■653 ▼aHeavy ion
■653 ▼aQuark-Gluon Plasma
■690 ▼a0605
■690 ▼a0599
■690 ▼a0748
■71020▼aColumbia University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-04B.
■773 ▼tDissertation Abstract International
■790 ▼a0054
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16935312▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
