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Hadronic Interactions at High and Low Energies

Utheim, Marius LU (2021)
Abstract
In the past, development of the PYTHIA event generator has mainly concentrated on the physics of proton–proton collisions at high energies, as this is the most important case to modern high energy physics experiments. However, there are situations where more generic beam configurations are relevant. This thesis presents implementations and applications of such processes in PYTHIA. The two applications discussed in this thesis are hadronic rescattering, and hadronic cascades in media. These are developed in Papers I and Iv, while Papers II and III present physics studies of rescattering.

Paper I: A framework for hadronic rescattering is implemented. This includes both the rescattering algorithm itself, as well as modelling low... (More)
In the past, development of the PYTHIA event generator has mainly concentrated on the physics of proton–proton collisions at high energies, as this is the most important case to modern high energy physics experiments. However, there are situations where more generic beam configurations are relevant. This thesis presents implementations and applications of such processes in PYTHIA. The two applications discussed in this thesis are hadronic rescattering, and hadronic cascades in media. These are developed in Papers I and Iv, while Papers II and III present physics studies of rescattering.

Paper I: A framework for hadronic rescattering is implemented. This includes both the rescattering algorithm itself, as well as modelling low energy interactions. Model tests are presented for proton–proton collisions.

Paper II: The effects of rescattering in heavy ion collisions are studied, using the ANGANTYR framework to simulate the collisions. Of note, results indicate that rescattering can produce a significant amount of collective flow.

Paper III: This work studies rescattering as a production mechanism for exotic hadrons, specifically the $χ_{c1}(3872)$ tetraquark and the $P_c^+(4312)$, $P_c^+(4440)$ and $P_c^+(4457)$ pentaquarks.

Paper IV: Modelling of high energy collisions in PYTHIA is extended to general hadron–nucleon interactions. The major parts of this extension are to define cross sections for these interactions and parton distribution functions for the hadrons involved. The paper studies the features of this model in the context of hadronic cascades in media, primarily cascades initiated by cosmic rays in the atmosphere, using a toy model. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Professor Elfner Hannah, Institute for Theoretical Physics, Goethe Universität Frankfurt am Main
organization
publishing date
type
Thesis
publication status
published
subject
keywords
QCD, Phenomenology, Hadronic rescattering, Heavy ions, Exotic hadrons, Cosmic rays
pages
256 pages
publisher
Lund
defense location
Lundmarksalen, Sölvegatan 27, 223 62 Lund Join via zoom: https://lu-se.zoom.us/j/66475911267?pwd=ZGdsaTdMLzk3R25uWG9IRWs5b2Ztdz09 passcode 2021
defense date
2021-09-17 10:00:00
ISBN
9789178959747
9789178959730
language
English
LU publication?
yes
id
997a9ae7-7518-4e2e-b6b8-bf51b951758d
date added to LUP
2021-08-19 14:16:25
date last changed
2021-08-23 09:54:19
@phdthesis{997a9ae7-7518-4e2e-b6b8-bf51b951758d,
  abstract     = {{In the past, development of the PYTHIA event generator has mainly concentrated on the physics of proton–proton collisions at high energies, as this is the most important case to modern high energy physics experiments. However, there are situations where more generic beam configurations are relevant. This thesis presents implementations and applications of such processes in PYTHIA. The two applications discussed in this thesis are hadronic rescattering, and hadronic cascades in media. These are developed in Papers I and Iv, while Papers II and III present physics studies of rescattering.<br/><br/>Paper I: A framework for hadronic rescattering is implemented. This includes both the rescattering algorithm itself, as well as modelling low energy interactions. Model tests are presented for proton–proton collisions.<br/><br/>Paper II: The effects of rescattering in heavy ion collisions are studied, using the ANGANTYR framework to simulate the collisions. Of note, results indicate that rescattering can produce a significant amount of collective flow.<br/><br/>Paper III: This work studies rescattering as a production mechanism for exotic hadrons, specifically the $χ_{c1}(3872)$ tetraquark and the $P_c^+(4312)$, $P_c^+(4440)$ and $P_c^+(4457)$ pentaquarks.<br/><br/>Paper IV: Modelling of high energy collisions in PYTHIA is extended to general hadron–nucleon interactions. The major parts of this extension are to define cross sections for these interactions and parton distribution functions for the hadrons involved. The paper studies the features of this model in the context of hadronic cascades in media, primarily cascades initiated by cosmic rays in the atmosphere, using a toy model.}},
  author       = {{Utheim, Marius}},
  isbn         = {{9789178959747}},
  keywords     = {{QCD; Phenomenology; Hadronic rescattering; Heavy ions; Exotic hadrons; Cosmic rays}},
  language     = {{eng}},
  month        = {{08}},
  publisher    = {{Lund}},
  school       = {{Lund University}},
  title        = {{Hadronic Interactions at High and Low Energies}},
  url          = {{https://lup.lub.lu.se/search/files/101433866/thesis.pdf}},
  year         = {{2021}},
}