Bayesian model comparison of Higgs couplings

Johannes Bergström and Stella Riad
Phys. Rev. D 91, 075008 – Published 14 April 2015

Abstract

We investigate the possibility of contributions from physics beyond the Standard Model (SM) to the Higgs couplings, in the light of the LHC data. The work is performed within an interim framework where the magnitude of the Higgs production and decay rates are rescaled through Higgs coupling scale factors. We perform Bayesian parameter inference on these scale factors, concluding that there is good compatibility with the SM. Furthermore, we carry out a Bayesian model comparison on all models where any combination of scale factors can differ from their SM values and find that typically models with fewer free couplings are strongly favored. We consider the evidence that each coupling individually equals the SM value, making the minimal assumptions on the other couplings. Finally, we make a comparison of the SM against a single “not-SM” model and find that there is moderate to strong evidence for the SM.

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  • Received 18 December 2014

DOI:https://doi.org/10.1103/PhysRevD.91.075008

© 2015 American Physical Society

Authors & Affiliations

Johannes Bergström*

  • Departament d’Estructura i Constituents de la Matèria and Institut de Ciencies del Cosmos, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain

Stella Riad

  • Department of Theoretical Physics, School of Engineering Sciences, KTH Royal Institute of Technology-AlbaNova University Center, Roslagstullsbacken 21, 106 91 Stockholm, Sweden

  • *bergstrom@ecm.ub.edu
  • sriad@kth.se

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Vol. 91, Iss. 7 — 1 April 2015

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