Abstract
We show that in a multi-Higgs model in which one Higgs fits the LHC 125 GeV state, one or more of the other Higgs bosons can mediate DM-nucleon interactions with maximal DM isospin violation being possible for appropriate Higgs-quark couplings, independent of the nature of DM. We then consider the explicit example of a Type II two-Higgs-doublet model, identifying the h or H as the 125 GeV state while the H or h, respectively, mediates DM-nucleon interactions. Finally, we show that if a stable scalar, S, is added then it can be a viable light DM candidate with correct relic density while obeying all direct and indirect detection limits.
Highlights
Small SS branching ratio) while correct relic abundance can be achieved via relatively strong interactions of the H (h) with the S
II we briefly describe the current status of direct detection experiments and show how isospin-violating interactions of DM are possible in the Type II 2HDM context, independently of whether or not dark matter is a Higgs boson
Experimental results are typically translated into the event rate for the spin-independent cross section for DM scattering off a nucleon σDSIM−N as a function of DM mass
Summary
DM is a compelling window to new physics and a primary means for its direct detection is via scattering off nucleons. Where H sums over the Higgs mediators contributing to the t-channel diagrams, CUH,D denote the H couplings to up-, down-type quarks, respectively, normalized to their SM values, while the ΛH are dimensionless parameters specifying the strengths of the H couplings to a pair of DM particles. Using Eq (2.2) and the Higgs-quark couplings CU , CD of Table 1, a given value of fn/fp requires: tan β. SM-like implies that tan β and sin α must lie within the broad central yellow band Combining this with the fn/fp ∼ −0.7 requirement leaves only a small region in each of the (tan β, sin α) parameter spaces, located near tan β ∼ 1 and sin α ∼ −0.7 (+0.7), implying CDH ∼ −CUH ∼ 1 (CUh ∼ −CDh ∼ 1) for the h125 (H125) scenario
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