The European Physical Journal C

, 72:2205

The electroweak fit of the standard model after the discovery of a new boson at the LHC

  • The Gfitter Group
  • M. Baak
  • M. Goebel
  • J. Haller
  • A. Hoecker
  • D. Kennedy
  • R. Kogler
  • K. Mönig
  • M. Schott
  • J. Stelzer
Regular Article - Theoretical Physics

DOI: 10.1140/epjc/s10052-012-2205-9

Cite this article as:
The Gfitter Group, Baak, M., Goebel, M. et al. Eur. Phys. J. C (2012) 72: 2205. doi:10.1140/epjc/s10052-012-2205-9

Abstract

In view of the discovery of a new boson by the ATLAS and CMS Collaborations at the LHC, we present an update of the global Standard Model (SM) fit to electroweak precision data. Assuming the new particle to be the SM Higgs boson, all fundamental parameters of the SM are known allowing, for the first time, to overconstrain the SM at the electroweak scale and assert its validity. Including the effects of radiative corrections and the experimental and theoretical uncertainties, the global fit exhibits a p-value of 0.07. The mass measurements by ATLAS and CMS agree within 1.3σ with the indirect determination \(M_{H}=94^{\,+25}_{\,-22}~\mathrm{GeV}\). Within the SM the W boson mass and the effective weak mixing angle can be accurately predicted to be MW=80.359±0.011 GeV and \(\sin ^{2}\theta ^{\ell }_{{\rm eff}}= 0.23150\pm 0.00010\) from the global fit. These results are compatible with, and exceed in precision, the direct measurements. For the indirect determination of the top quark mass we find \(m_{t}= 175.8^{\:+2.7}_{\:-2.4}~ \mathrm {GeV}\), in agreement with the kinematic and cross-section-based measurements.

Copyright information

© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica 2012

Authors and Affiliations

  • The Gfitter Group
  • M. Baak
    • 1
  • M. Goebel
    • 2
  • J. Haller
    • 3
  • A. Hoecker
    • 1
  • D. Kennedy
    • 2
  • R. Kogler
    • 3
  • K. Mönig
    • 2
  • M. Schott
    • 1
  • J. Stelzer
    • 4
  1. 1.CERNGenevaSwitzerland
  2. 2.DESYHamburg and ZeuthenGermany
  3. 3.Institut für ExperimentalphysikUniversität HamburgHamburgGermany
  4. 4.Department of Physics and AstronomyMichigan State UniversityEast LansingUSA