Two-loop electroweak fermionic corrections to sin2 θeffb over(b, ̄)

Link:
Autor/in:
Erscheinungsjahr:
2009
Medientyp:
Text
Schlagworte:
  • Bosons
  • Correction
  • Higgs boson
  • Decay
  • Quarks
  • Neutrinos
  • Effective weak-mixing angle
  • Bernstein-Tkachov algorithm
  • Electroweak radiative corrections
  • Bosons
  • Correction
  • Higgs boson
  • Decay
  • Quarks
  • Neutrinos
Beschreibung:
  • We present the first calculation of the two-loop electroweak fermionic correction to the flavour-dependent effective weak-mixing angle for bottom quarks, sin2 θeffb over(b, ̄). For the evaluation of the missing two-loop vertex diagrams, two methods are employed, one based on a semi-numerical Bernstein-Tkachov algorithm and the second on asymptotic expansions in the large top-quark mass. A third method based on dispersion relations is used for checking the basic loop integrals. We find that for small Higgs-boson mass values, MH ∝ 100   GeV, the correction is sizable, of order O (10- 4). © 2009 Elsevier B.V. All rights reserved.
Lizenz:
  • info:eu-repo/semantics/restrictedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/fa7d5c56-ff0f-4299-9455-4ee0d1c29045