Abstract
In this work we complete a model independent analysis of dark matter constraining its mass and interaction strengths with data from astro- and particle physics experiments. We use the effective field theory framework to describe interactions of thermal dark matter particles of the following types: real and complex scalars, Dirac and Majorana fermions, and vector bosons. Using Bayesian inference we calculate posterior probability distributions for the mass and interaction strengths for the various spin particles. The observationally favoured dark matter particle mass region is 10-100 GeV with effective interactions that have a cut-off at 0.1-1 TeV. This mostly comes from the requirement that the thermal abundance of dark matter not exceed the observed value. Thus thermal dark matter coupled with present data implies new physics most likely under 10 TeV.
Highlights
With negligible strength [2]
We focus on the minimal scale because in this work we are primarily interested in the scale of new physics that is the clos
In the 2σ credible region, the Majorana fermion (MF) distribution stretches higher in mass (∼ 80 TeV) than in any other model, reflecting the results presented in table 5
Summary
The simplest way to build an effective field theory of dark matter is to introduce a new Standard Model (SM) gauge singlet quantum field, χ. This field is assumed to be odd under a new parity transformation, the eigenvalues of which are conserved quantum numbers. For completeness we examine five different cases with the χ field being a real scalar (RS), complex scalar (CS), Dirac fermion (DF), Majorana fermion (MF), and vector boson (VB). The interaction Lagrangian containing all Lorentz and gauge invariant operators of dimension-5 for (real or complex) scalar and vector boson, and dimension-6 for Dirac or Majorana fermion particles is scematically given by. Operator Oi,f χχff χγ5χff χχfγ5f χγ5χfγ5f χγμχfγμf χγμγ5χfγμf χγμχfγμγ5f χγμγ5χfγμγ5f
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