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Title page for ETD etd-08212018-112112

Type of Document Dissertation
Author Ni, Hong
Author's Email Address knihone2018@gmail.com
URN etd-08212018-112112
Title Nuclear modifications in strange particle production in proton-lead collisions at the LHC
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Julia Velkvoska Committee Chair
Alfredo Gurrola Committee Member
Senta Greene Committee Member
Shane Hutson Committee Member
  • LHC
  • CMS
  • nuclear modification factor
  • proton-lead collisions
  • QGP
  • strange particles
Date of Defense 2018-08-03
Availability unrestricted
Identified particle spectra provide an important tool for understanding the particle production mechanism and the dynamical evolution of the quark-gluon plasma (QGP) created in relativistic heavy ion collisions. Studies involving strange and multi-strange hadrons carry additional information since there is no net strangeness content in the initial colliding system. In smaller collisions systems, such as proton-proton (pp) or proton-lead (pPb) collisions it was

expected that QGP will not be formed, due to the small volume. However some recent observations of collective effects in high-multiplicity pp and pPb collisions have led to a paradigm shift. This thesis examines the question of QGP formation and particle production mechanisms in pp, pPb and PbPb collisions using strange and multi-strange hadrons detected in the CMS experiment over a broad kinematic range. The spectral shapes and particle ratios are

compared in the different collision systems for events that have the same multiplicity and interpreted in the context of hydrodynamics models. Nuclear modification factors are measured out to high transverse momentum in minimum bias pPb collisions in several rapidity regions with the goal of

investigating possible modifications in hard-scattering processes using identified hadrons. Forward-backward rapidity yield asymmetries are also studied as a function of transverse momentum to search for initial-state effects, such as shadowing in the nuclear parton distributions.

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