Towards a general analysis of LHC data within two-Higgs-doublet models

Abstract

The data accumulated so far confirm the Higgs-like nature of the new boson discovered at the LHC. The Standard Model Higgs hypothesis is compatible with the collider results and no significant deviations from the Standard Model have been observed neither in the flavour sector nor in electroweak precision observables. We update the LHC and Tevatron constraints on CP-conserving two-Higgs-doublet models without tree-level flavour-changing neutral currents. While the relative sign between the top Yukawa and the gauge coupling of the 126 GeV Higgs is found be the same as in the SM, at 90% CL, there is a sign degeneracy in the determination of its bottom and tau Yukawa couplings. This results in several disjoint allowed regions in the parameter space. We show how generic sum rules governing the scalar couplings determine the properties of the additional Higgs bosons in the different allowed regions. The role of electroweak precision observables, low-energy flavour constraints and LHC searches for additional scalars to further restrict the available parameter space is also discussed. ; We thank Xin-Qiang Li and Martin Jung for fruitful collaborations related to the flavour constraints on the A2HDM. We also acknowledge useful discussions with Luca Fiorini and Emilie Passemar regarding the experimental data. This work has been supported in part by the Spanish Government and ERDF funds from the EU Commission [Grants FPA2011-23778 and CSD2007-00042 (Consolider Project CPAN)] and by Generalitat Valenciana under Grant No. PROMETEOII/2013/007. The work of A. C. is supported by the Spanish Ministry MECD through the FPU grant AP2010-0308. The work of V. I. is supported by the Spanish Ministry MEC through the FPI grant BES-2012-054676. ; Peer reviewed