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Title page for ETD etd-03192015-152905

Type of Document Dissertation
Author Tuo, Shengquan
Author's Email Address shengquan.tuo@vanderbilt.edu
URN etd-03192015-152905
Title Multiparticle Azimuthal Correlation Measurements in Lead-Lead and Proton-Lead Collisions at LHC with the CMS Detector
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Julia Velkovska Committee Chair
Akram Aldroubi Committee Member
Robert Scherrer Committee Member
Senta Greene Committee Member
Will Johns Committee Member
  • Heavy ion collision
  • Multiparticle Correlation
  • LHC
  • Flow
  • CMS
Date of Defense 2015-02-05
Availability unrestricted
The azimuthal correlations of charged particles produced in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV and proton-lead collisions at 5.02 TeV have been measured using multiparticle correlations. In PbPb collisions, the second, fourth and sixth Fourier coefficients of the charged-particle azimuthal distributions are studied as a function of the particle transverse momentum, pseudorapidity, and collision centrality. The results from several experimental methods that have different sensitivity to the fluctuations in the initial-state of ultra-relativistic heavy ion collisions are compared. The combined results provide access to the properties of the quark-gluon plasma through comparisons with the predictions of viscous hydrodynamic calculations. A near-perfect fluid behavior is observed in PbPb collisions at $sqrt{s_{_{NN}}}$ = 2.76 TeV at the LHC, similar to previous findings at lower center-of-mass energies from RHIC. The system-size dependence of the collective flow is studied in peripheral PbPb collisions and in high-multiplicity pPb collisions. Remarkable similarities are found when the two systems are compared for collisions with the same final-state particle multiplicity. Four-particle correlations emerge in pPb collisions with more than 40 particles detected in the final state. The elliptic anisotropies derived from four-particle or all-particle correlations are found to agree within 10\%, which indicates a high degree of collectivity in high-multiplicity pPb collisions and might be an evidence for the smallest liquid droplet ever produced in the laboratory.
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