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Composite Higgs sketch

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Abstract

The couplings of a composite Higgs to the standard model fields can deviate substantially from the standard model values. In this case perturbative unitarity might break down before the scale of compositeness, Λ, is reached, which would suggest that additional composites should lie well below Λ. In this paper we account for the presence of an additional spin 1 custodial triplet ρ ±,0. We examine the implications of requiring perturbative unitarity up to the scale Λ and find that one has to be close to saturating certain unitarity sum rules involving the Higgs and ρ couplings. Given these restrictions on the parameter space we investigate the main phenomenological consequences of the ρ’s. We find that they can substantially enhance the h → γγ rate at the LHC even with a reduced Higgs coupling to gauge bosons. The main existing LHC bounds arise from di-boson searches, especially in the experimentally clean channel ρ ± → W ± Z → 3l + ν. We find that a large range of interesting parameter space with 700 GeV ≾ m ρ ≾ 2 TeV is currently experimentally viable.

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Authors and Affiliations

  1. Dipartimento di Fisica, Università di Padova and INFN, Sezione di Padova, Via Marzolo 8, I-35131, Padova, Italy

    Brando Bellazzini

  2. SISSA, Via Bonomea 265, I-34136, Trieste, Italy

    Brando Bellazzini

  3. Department of Physics, LEPP, Cornell University, 469 Physical Sciences Building, Ithaca, NY, 14853, USA

    Csaba Csáki & Javi Serra

  4. Department of Physics, Syracuse University, 311 Physics Building, Syracuse, NY, 13244, USA

    Jay Hubisz

  5. Department of Physics, University of California, One Shields Avenue, Davis, CA, 95616, USA

    John Terning

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  1. Brando Bellazzini
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  2. Csaba Csáki
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  3. Jay Hubisz
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  4. Javi Serra
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  5. John Terning
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Correspondence to Brando Bellazzini.

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ArXiv ePrint: 1205.4032

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Bellazzini, B., Csáki, C., Hubisz, J. et al. Composite Higgs sketch. J. High Energ. Phys. 2012, 3 (2012). https://doi.org/10.1007/JHEP11(2012)003

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