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Two-Loop Radiative Corrections of Electroweak Mixing Angle and Branching Fraction for Z->bb.

Huang, Yi-Cheng (2013) Two-Loop Radiative Corrections of Electroweak Mixing Angle and Branching Fraction for Z->bb. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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In this thesis I develop a numerical technique which is based on the Mellin-Barnes representation to calculate two-loop Feynman integrals. The resulting complex integrals of high dimensions are being applied with some treatments, such as the variable transform, reduction formulas, etc, to improve the convergence of the integrals. The approach is adopted to compute the two-loop radiative corrections of the electroweak mixing angle and the hadronic branching ratio for the process Z->bb. I focus on contributions with an internal fermion sub-loop using the on-shell renormalization scheme. The results will help to derive improved constraints on the Higgs particle.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairFreitas, Ayresafreitas@pitt.eduAFREITAS
Committee MemberSwanson, Ericswansone@pitt.eduSWANSONE
Committee MemberMueller, Jamesmueller@pitt.eduMUELLER
Committee MemberDevaty, Robertdevaty@pitt.eduDEVATY
Committee MemberRothstein,
Date: 25 January 2013
Date Type: Publication
Defense Date: 25 July 2012
Approval Date: 25 January 2013
Submission Date: 19 November 2012
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 70
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: electroweak, precision tests, weak mixing angle, branching fractions, Mellin-Barnes.
Date Deposited: 25 Jan 2013 21:05
Last Modified: 15 Nov 2016 14:07


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