Constraints on dimension-seven operators with a derivative in effective field theory for Dirac dark matter

Tong Li,Yi Liao

doi:10.1016/j.physletb.2019.07.022

Abstract

The effective field theory (EFT) for dark matter (DM) has been widely used to investigate dark matter detection in both theoretical prediction and experimental analysis. To form a complete basis of effective operators for Dirac DM EFT at dimension seven, eight new four-fermion operators with a derivative in DM currents have recently been introduced. We discuss the experimental observables and constraints for the theoretical predictions of these new operators to constrain the DM mass and relevant energy scale. The observables from thermal relic abundance, indirect and direct detection, and LHC constraints are presented.

Highlights

Despite of substantial efforts in theory and experiment, the microscopic properties of dark matter (DM) particles are still unknown
Once the annihilation cross section obtained from a certain set of mχ and Λ is larger than the limit, we claim the corresponding parameter values are excluded by the Fermi-Large Area Telescope (LAT) dwarf spheroidal satellite galaxies (dSphs) measurement
In this work we have investigated new dimension-7 operators in effective field theory for Dirac fermionic dark matter

Summary

INTRODUCTION

Despite of substantial efforts in theory and experiment, the microscopic properties of dark matter (DM) particles are still unknown. Due to the plethora of competing theoretical models in the current status, it is not feasible to extract the fundamental properties of dark matter particles by contrasting theoretical predictions with observation. The simplest way to build an EFT for DM is to introduce a new SM gauge singlet field, χ We assume it to be a Dirac fermion in this article. The EFT Lagrangian with complete and independent dim-7 operators describing a pair of the Dirac DM χ field interacting with the quarks, gluons and photon is given by. In this work we confront the theoretical predictions of these new dim-7 operators with the experimental observables and constraints to infer the most probable mass of DM and its interaction strengths with ordinary matter.

Relic Density

Indirect Detection

Direct Detection

LHC Constraints

RESULTS

CONCLUSION