Hadron Structure in Electroweak Precision Measurements

This thesis examines the Z box contribution to the weak charge of the proton. Here, by combining recent parity-violating electron-deuteron scattering data with our current understanding of parton distribution functions, the author shows that one can limit this model dependence. The resulting construction is a robust model of the and Z structure functions that can also be used to study a variety of low-energy phenomena. Two such cases are discussed in this work, namely, the nucleon's electromagnetic polarizabilities and quark-hadron duality.

By using phenomenological information to constrain the input structure functions, this important but previously poorly understood radiative correction is determined at the kinematics of the parity-violating experiment, QWEAK, to a degree of precision more than twice that of the previous best estimate.

A detailed investigation into available parametrizations of the electromagnetic and interference cross-sections indicates that earlier analyses suffered from the inability to correctly quantify their model dependence.

Nominated as an outstanding PhD thesis by the University of Adelaide, Australia Introduces the Standard Model of particle physics at the graduate level Provides an extensive overview of the models and parameterizations used to describe electron-proton cross-sections Leads to improved understanding of the internal structure of the nucleon Includes supplementary material: sn.pub/extras

Contenu
Introduction.- The Standard Model and beyond.- Precision tests of the SM.- Structure functions.- Adelaide-Jefferson Lab-Manitoba model.- The Z box corrections.- Electric and magnetic polarizabilities of the proton.- Quark-hadron duality.- Summary and conclusion.