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Title page for ETD etd-07162015-015438

Type of Document Dissertation
Author Roach, Dillon Patrick
Author's Email Address dillon.p.roach@vanderbilt.edu
URN etd-07162015-015438
Title Inclusive Lambda Baryon Spectra in Au+Au Collisions at sqrt(S_{NN}) = 200 GeV
Degree PhD
Department Physics
Advisory Committee
Advisor Name Title
Professor Senta V. Greene Committee Chair
Professor Charles F. Maguire Committee Member
Professor David J. Furbish Committee Member
Professor Richard F. Haglund Committee Member
Professor Volker E. Oberacker Committee Member
  • quark gluon plasma
  • hadronization
  • lambda baryon
Date of Defense 2015-04-21
Availability unrestricted
Studies of the lambda and anti-lambda baryons in Au+Au collisions provide information on in-medium energy loss and hadronization mechanisms, which are important to understanding the quark-gluon plasma created in ultra-relativistic heavy ion collisions. A combination of high statistics and new methods of analysis enable a study of lambda baryons to much greater p_{T}, 7 GeV/c, than was possible in previous studies at PHENIX. During the Au+Au RHIC run in 2007 the PHENIX experiment acquired over 5 billion minimum bias events at sqrt(S_{NN}) = 200 GeV. This large data set has the additional benefit of a new time-of-flight detector with approximately 70 ps intrinsic timing resolution. Lambda and anti-lambda spectra, nuclear modification factor R_{CP}, and relative particle abundances are presented. The results presented agree, within uncertainties, with published data and support the notions of both quark degrees of freedom in the quark-gluon plasma and of hadronization models that include recombination as a leading source of baryon production through intermediate p_{T}.
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