author={Christina Marie Bird and Robert Victor Kowalewski and Maxim Pospelov},
  journal={Modern Physics Letters A},
The flavor-changing neutral current transition b → s can serve as a sensitive probe of WIMP dark matter models, if the WIMP mass is under 2 GeV. In this work we extend our earlier analysis to a generic class of models where the interaction between the dark matter sector and the Standard Model matter sector is mediated by the Higgs boson(s). We show that experimental limits on the decays of B-mesons to K(K*) and missing energy provide stringent constraints on the parameter space of such models… 

Constraints on scalar dark matter from direct experimental searches

The standard model (SM) plus a real gauge-singlet scalar field dubbed darkon (SM+D) is the simplest model possessing a weakly interacting massive particle (WIMP) dark-matter candidate. The upper

Flavor-changing hyperon decays with light invisible bosons

We consider the strangeness-changing decays of hyperons into another baryon and missing energy which is carried away by a pair of invisible spinless bosons. Pursuing a model-independent approach and

FCNC portals to the dark sector

The most general basis of operators parametrizing a low-scale departure from the SM particle content is constructed. The SM gauge invariance is enforced, and operators of lowest dimensions are

FCNC portals to the dark sector

A bstractThe most general basis of operators parametrizing a low-scale departure from the SM particle content is constructed. The SM gauge invariance is enforced, and operators of lowest dimensions

Direct signals from electroweak singlets through the Higgs portal

  • R. Dick
  • Physics
    International Journal of Modern Physics D
  • 2018
We review predictions and constraints for nuclear recoil signals from Higgs portal dark matter under the assumption of standard thermal creation from freeze-out. Thermally created scalar and vector

Scalar dark matter search at the LHC through flavor-changing neutral current top decay

We discuss an extended standard model electroweak sector which contains a stable scalar dark matter particle, the D boson. To search for the D boson at the LHC we exploit the flavor-changing neutral

Missing particle associated with two bottom quarks at the LHC: Mono-b versus 2b with razor variables

The extended Higgs sector, such as by a second Higgs doublet of type-II, provides portals to dark sector which contains missing particles at the LHC, e.g., dark matter (DM) particles. In this paper,

Constraining light dark matter with low-energy e+e− colliders

A bstractWe investigate the power of low-energy, high-luminosity electron-positron colliders to probe hidden sectors with a mass below ~ 10 GeV that couple to Standard Model particles through a light



Dark matter particle production in b-->s transitions with missing energy.

The minimal scalar dark matter model is analyzed to show that the width of the decay mode with two dark matter scalars B-->KSS may exceed the decay width in the standard model channel, B-->Knunu, by up to 2 orders of magnitude.

Gauge singlet scalars as cold dark matter.

  • Mcdonald
  • Physics
    Physical review. D, Particles and fields
  • 1994
The regions of the (m(S),lambda(S)) parameter space which can be probed by present and future experiments designed to detect scattering of S dark matter particles from Ge nuclei, and to observe upward-moving muons and contained events in neutrino detectors due to high-energy neutrinos from annihilations of Sdark matter particles in the Sun and the Earth, are discussed.

Higgs-boson-mediated FCNC in supersymmetric models with large tan(beta)

In the supersymmetric models with nontrivial flavour structure in the soft-breaking sector the exchange of neutral Higgses mediates ΔF=2 transitions. This mechanism is studied for ΔS,ΔB=2 processes

Top quark mass in supersymmetric SO(10) unification.

The successful prediction of the weak mixing angle suggests that the effective theory beneath the grand unification scale is the minimal super- symmetric standard model (MSSM) with just two Higgs doublets, and the top quark mass can be predicted in terms of the MSSM parameters.

Yukawa coupling unification with supersymmetric threshold corrections.

  • Hempfling
  • Physics
    Physical review. D, Particles and fields
  • 1994
This work presents an example of such a model with a horizontal gauge symmetry that naturally explains the fermion mass hierarchy and the small mixing angles of the Kobayashi-Maskawa matrix and achieves the unification of the lepton and the down-quark Yukawa couplings without introducing large Higgs multiplets.

Analysis of neutral Higgs-boson contributions to the decays B s → l + l − and B ¯ → Kl + l −

We report on a calculation of Higgs-boson contributions to the decays B_s -> l^+l^- and B -> K l^+l^- (l=e, mu) which are governed by the effective Hamiltonian describing b -> s l^+ l^-. Compact

Unified minimal supersymmetric model with large Yukawa couplings.

  • RattazziSarid
  • Physics
    Physical review. D, Particles and fields
  • 1996
Focusing on SU(5) or SO(10) unification, the relationship between the top and bottom masses and the superspectrum is analysed, and the phenomenological implications of the grand unified theory (GUT) conditions on scalar masses are analyzed.

Escaping the large fine-tuning and little hierarchy problems in the next to minimal supersymmetric model and h --> aa decays.

We demonstrate that the next to minimal supersymmetric model can have small fine-tuning and modest top-squark mass while still evading all experimental constraints. For small tan(beta (large