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|Title: ||Lattice phenomenology of minimal walking technicolor|
|Authors: ||Kerrane, Eoin|
|Supervisor(s): ||Del Debbio, Luigi|
|Issue Date: ||22-Jun-2012|
|Publisher: ||The University of Edinburgh|
|Abstract: ||As results from the Large Hadron Collider (LHC) begin to shed light on the
physics of the electroweak scale, which has been of primary interest to theorists
for many years, we have entered a phase where critical judgement of the many
models of electroweak symmetry breaking (EWSB) that have been developed in
recent years will be possible.
As this process continues, those models which are not additionally constrained
by emerging data attract increased scrutiny and interest. In this respect,
technicolor models, in which EWSB occurs dynamically through the spontaneous
chiral symmetry breaking in a new strongly coupled sector, are the subject of
growing research activity.
The focus of this work is a program of investigation of Minimal Walking
Technicolor (MWT), a candidate theory for the new strongly coupled sector of a
model of dynamical EWSB using Lattice Gauge Theory (LGT) techniques.
We have performed an improved comprehensive study of mesonic spectral
observables within MWT, with emphasis on nite volume e ects arising from
nite temporal and spatial boundaries. Our results clarify the role of nite
volume e ects in such studies, while con rming the near-conformal behaviour
of the theory in the infra-red, and indicating a relatively small value of the mass
anomalous dimension, in agreement with other studies.
We also describe a calculation of the leading order hadronic vacuum polarisation
contribution to the anomalous magnetic moment of the muon from a lattice
simulation of 2+1
avour lattice QCD using Domain Wall Fermions (DWF).
We investigate in detail a number of systematic uncertainties involved in this
calculation, determining how to e ectively bring them under control, and obtain
a result in close agreement with previous determinations from LGT studies, from
calculations based on independent experimental data, and from experimental measurements.
We present a preliminary calculation of the contribution to the electroweak
S parameter from MWT, using a mixed-action simulation involving the DWF
action used for the valence sector combined with gauge con gurations generated
using the Wilson fermion action for sea quarks.|
|Appears in Collections:||Physics thesis and dissertation collection|
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