Mapping the redistribution of jet energy in PbPb collisions at the LHC with CMS
Name
1196186502-MIT.pdf
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26.26 MB
Format
Adobe PDF
Checksum (MD5)
d409c7d3fa9448fb269d3916eec7036b
Author(s)
McGinn, Christopher Francis.
Advisor(s)
Yen-Jie Lee.
Date Issued
2019
Publisher
Massachusetts Institute of Technology
Abstract
Quenched jets produced in heavy ion collisions at the LHC and reconstructed with the CMS detector are studied to understand the nature of interactions between hardscattered partons and the simultaneously produced hot and dense medium, the Quark- Gluon Plasma (QGP). Jets are objects with color charge evolving through many energy scales, so are an excellent tool for scattering experiment in QGP, with potential to resolve quasiparticle structure and induce medium response. Redistribution of jet energy is quantified in two methods: measurement of transverse PT of final state particles projected onto dijet azimuthal axis, and measurement of jet production cross sections in PbPb and pp as function of jet radius. Missing momentum shows recovery of lost energy when moving beyond the jet cone for a fixed collection of jets, approaching full recovery at ... A jet radius scan of jet production cross sections shows consistent observed suppression in PbPb when compared to appropriately scaled pp at all radii. However, less suppression is observed with increasing jet resolution parameter R. In combination the results imply that while jet energy lost to medium interactions can be found when looking beyond the jet cone, the substantial changes to the jet population in pp at each studied R lead to sustained spectral suppression with even the largest cone size.
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2019
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 195-202).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.
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