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 flavourchanging 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.

Flavour-changing top decays in the aligned two-Higgs-doublet model

“…These direct searches give an upper bound on the Yukawa combination |ς u ς d |, which, although being weaker than the one from Br(B → X s γ), basically exclude one of the two possible strips allowed by the latter [25].…”

“…Constraints on the A2HDM from flavour and collider data have been analyzed in refs. [13][14][15][16][17][18] and [19][20][21][22][23][24][25][26], respectively, extracting relevant bounds on the model parameters.…”

“…• The LHC and Tevatron Higgs data imply that cosα > 0.9 (68% CL) and |y h f | ∼ 1 (f = u, d, l) [21,25]. We work in the limit cosα = 1 so that no constraints on the alignment parameters are obtained from the 125 GeV Higgs data [21,25].…”

“…We work in the limit cosα = 1 so that no constraints on the alignment parameters are obtained from the 125 GeV Higgs data [21,25].…”

Higgs and dark matter physics in the type-II two-Higgs-doublet model inspired by E 6 GUT

“…[1] for recent reviews). Also a lot of interests on this model have been drawn in light of new LHC data [2][3][4][5][6][7][8][9].…”