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Thermal QCD spectrum and potential: bottomonium at non-zero temperature / THOMAS SPRIGGS

Swansea University Author: THOMAS SPRIGGS

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DOI (Published version): 10.23889/SUthesis.65442

Abstract

The spectrum and potential of bottomonium mesons offer windows into strong force phenomenology. This thesis investigates these two constructs at non-zero temperature to explore thermal modifications of bound states. Lattice simulations are performed on two generations of the FASTSUM ensembles using...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Allton, C; Burns, T
URI: https://cronfa.swan.ac.uk/Record/cronfa65442
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Abstract: The spectrum and potential of bottomonium mesons offer windows into strong force phenomenology. This thesis investigates these two constructs at non-zero temperature to explore thermal modifications of bound states. Lattice simulations are performed on two generations of the FASTSUM ensembles using a nonrelativistic effective field theory of quantum chromodynamics, NRQCD. These ensembles contain 2+1 flavours of dynamical sea quarks at temperatures spanning the pseudocritical temperature. Maximum likelihood estimation is used to recover the spectrum of two representative bottomonium states, Υ and χb1, from which the ground state mass and width are determined at non-zero temperature. The central and spin-dependent potentials between the bottom quark and antiquarkare calculated using the approach from the HAL QCD collaboration. The standard implementation is used and then significant improvements are presented that provide a validation of the use of the non-relativistic Schrödinger equation at non-zero temperature.
Item Description: Part of this thesis has been redacted to protect personal information
Keywords: Lattice field theory, particle physics, bottomonium, hadron spectroscopy
College: Faculty of Science and Engineering
Funders: UKRI, STFC CDT.

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