Electroweak two-loop corrections to the effective weak mixing angle | Zendy

M. Awramik | Zendy; M. Czakon | Zendy; A. Freitas | Zendy

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Electroweak two-loop corrections to the effective weak mixing angle

Author(s) -

M. Awramik,

M. Czakon,

A. Freitas

Publication year - 2006

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2006/11/048

Subject(s) - electroweak interaction , physics , parametrization (atmospheric modeling) , mixing (physics) , observable , computation , loop (graph theory) , particle physics , simple (philosophy) , order (exchange) , standard model (mathematical formulation) , quark , theoretical physics , statistical physics , algorithm , quantum mechanics , radiative transfer , mathematics , philosophy , epistemology , combinatorics , finance , economics , archaeology , gauge (firearms) , history

Recently exact results for the complete electroweak two-loop contributions tothe effective weak mixing angle were published. This paper illustrates thetechniques used for this computation, in particular the methods for evaluatingthe loop diagrams and the proper definition of Z-pole observables atnext-to-next-to-leading order. Numerical results are presented in terms ofsimple parametrization formulae and compared in detail with a previous resultof an expansion up to next-to-leading order in the top-quark mass. Finally, anestimate of the remaining theoretical uncertainties from unknown higher-ordercorrections is given.

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