One of the goals of the Relativistic Heavy Ion Collider (RHIC) Beam Energy Scan program is to explore whether signatures of the quark-gluon plasma can be turned off, search for a potential Quantum-Chromodynamic (QCD) critical point, as well as identify the phase transition between hadronic and partonic matter.
This program ran from the years 2010 through 2014 and certain observables such as the directed flow of protons and higher moments of net-protons show features that may suggest some sort of transition to hadron-dominated matter below 20 GeV.
The Solenoidal Tracker at RHIC (STAR) Fixed-Target program was created to extend center of mass energies below √ sNN = 7.7 GeV, down to √ sNN = 3.0 GeV, as these energies are not practical to do with colliding beams at RHIC.
This will be crucial in the second phase of the Beam Energy Scan program, BES-II, as data from energies within this range may yield information of the phase transition. The capabilities of reconstructing interactions with a fixed-target geometry needed to be demonstrated for the future of the program in BES-II. In 2015, two test runs with a fixed-target geometry were done with the STAR detector; the first was Au + Au at √ sNN = 4.5 GeV and the second, a month later, was Al + Au at √ sNN = 4.9 GeV center-of-mass energy.
This dissertation focuses on the asymmetric Al + Au collisions but will involve mentions of the Au + Au run.
In this work, the spectra and rapidity density of π− and p are measured at the top 0-5%, 5-10%, 10-15%, 15-20%, 20-25%, and 25-30% most central collisions. In addition, the "stopping" for protons will be discussed.
|Advisor:||Cebra, Daniel A.|
|Commitee:||Calderon de la Barca Sanchez, Manuel, Vogt, Ramona L.|
|School:||University of California, Davis|
|School Location:||United States -- California|
|Source:||DAI-B 82/5(E), Dissertation Abstracts International|
|Subjects:||Physics, Quantum physics, Particle physics, Plasma physics, Energy|
|Keywords:||Baryon stopping, Pion, Proton production, Fixed-target collision, Beam Energy Scan program, Relativistic Heavy Ion Collider, Quark-gluon plasma, Solenoidal Tracker at RHIC, Center of mass|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be