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Electroweak precision observables, new physics and the nature of a 126 GeV Higgs boson

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Abstract

We perform the fit of electroweak precision observables within the Standard Model with a 126 GeV Higgs boson, compare the results with the theoretical predictions and discuss the impact of recent experimental and theoretical improvements. We introduce New Physics contributions in a model-independent way and fit for the S, T and U parameters, for the ϵ 1,2,3,b ones, for modified \( Zb\overline{b} \) couplings and for a modified Higgs coupling to vector bosons. We point out that composite Higgs models are very strongly constrained. Finally, we compute the bounds on dimension-six operators relevant for the electroweak fit.

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Authors and Affiliations

  1. INFN, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146, Roma, Italy

    Marco Ciuchini

  2. INFN, Sezione di Roma, Piazzale A. Moro 2, I-00185, Roma, Italy

    Enrico Franco, Satoshi Mishima & Luca Silvestrini

  3. Dipartimento di Fisica, Università di Roma “La Sapienza”, Piazzale A. Moro 2, I-00185, Roma, Italy

    Satoshi Mishima

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  1. Marco Ciuchini
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  2. Enrico Franco
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  3. Satoshi Mishima
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  4. Luca Silvestrini
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Correspondence to Satoshi Mishima.

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ArXiv ePrint: 1306.4644

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Ciuchini, M., Franco, E., Mishima, S. et al. Electroweak precision observables, new physics and the nature of a 126 GeV Higgs boson. J. High Energ. Phys. 2013, 106 (2013). https://doi.org/10.1007/JHEP08(2013)106

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  • DOI: https://doi.org/10.1007/JHEP08(2013)106

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