A concrete composite 2-Higgs doublet model
Stefania Curtis (INFN — Sezione di Firenze, and Department of Physics and Astronomy, University of Florence, Via G. Sansone 1, Sesto Fiorentino, 50019, Italy); Luigi Rose (School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, U.K., INFN — Sezione di Firenze, and Department of Physics and Astronomy, University of Florence, Via G. Sansone 1, Sesto Fiorentino, 50019, Italy); Stefano Moretti (School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, U.K., Particle Physics Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K.); Kei Yagyu (Seikei University, Musashino, Tokyo, 180-8633, Japan)
We consider a Composite Higgs Model (CHM) with two isospin doublet Higgs fields arising as pseudo Nambu-Goldstone bosons from a SO(6) → SO(4) × SO(2) breaking. The main focus of this work is to explicitly compute the properties of these Higgses in terms of the fundamental parameters of the composite sector such as masses, Yukawa and gauge couplings of the new spin-1 and spin-1/2 resonances. Concretely, we calculate the Higgs potential at one-loop level through the Coleman-Weinberg mechanism from the explicit breaking of the SO(6) global symmetry by the partial compositeness of fermions and gauge bosons. We derive then the phenomenological properties of the Higgs states and highlight the main signatures of this Composite 2-Higgs Doublet Model at the Large Hadron Collider, including modifications to the SM-like Higgs couplings as well as production and decay channels of heavier Higgs bosons. We also consider flavour bounds that are typical of CHMs with more than one Higgs doublet.
