Hadron Structure in Electroweak Precision Measurements

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Springer, Jul 24, 2015 - Science - 120 pages

This thesis examines the γZ 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 γγ and γZ 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.

 

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Contents

1 Motivation and Outline
1
2 Introduction to the Standard Model and Beyond
5
3 Precision Tests of the SM
19
4 Structure Functions
31
5 AdelaideJefferson LabManitoba Model
48
6 The γZV Correction
71
7 Electric and Magnetic Polarisabilities of the Proton
92
8 QuarkHadron Duality
103
9 Summary and Conclusion
115
Appendix A Further Determinations of e VγZ
118
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