Journal of High Energy Physics (Apr 2017)

Constraints on the trilinear Higgs self coupling from precision observables

  • G. Degrassi,
  • M. Fedele,
  • P.P. Giardino

DOI
https://doi.org/10.1007/JHEP04(2017)155
Journal volume & issue
Vol. 2017, no. 4
pp. 1 – 19

Abstract

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Abstract We present the constraints on the trilinear Higgs self coupling that arise from loop effects in the W boson mass and the effective sine predictions. We compute the contributions to these precision observables of two-loop diagrams featuring an anomalous trilinear Higgs self coupling. We explicitly show that the same anomalous contributions are found if the analysis of m W and sin2 θ eff lep is performed in a theory in which the scalar potential in the Standard Model Lagrangian is modified by an (in)finite tower of (Φ†Φ) n terms with Φ the Higgs doublet. We find that the bounds on the trilinear Higgs self coupling from precision observables are competitive with those coming from Higgs pair production.

Keywords