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Dissertation/Thesis Abstract

Study of Baryon Stopping, Pion and Proton Production from 4.9 GeV Al + Au Fixed-Target Collisions at Star
by Kinghorn, Todd Adler, Ph.D., University of California, Davis, 2020, 82; 28089833
Abstract (Summary)

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 πand 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.

Indexing (document details)
Advisor: Cebra, Daniel A.
Commitee: Calderon de la Barca Sanchez, Manuel, Vogt, Ramona L.
School: University of California, Davis
Department: Physics
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
Publication Number: 28089833
ISBN: 9798691213632
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