Radiative corrections to vectorlike portal dark matter

Abstract

A massive real scalar dark matter particle $S$ can couple to Standard Model leptons or quarks through a vector-like fermionic mediator $\psi$, a scenario known as the Vector-like portal. Due to helicity suppression of the annihilation cross section into a pair of SM fermions, it has been shown in previous works that radiative corrections, either at one-loop or through radiation of gauge bosons, may play a significant role both in determining the relic abundance and for indirect detection. All previous works considered the limit of massless final state quarks or leptons. In this work, we focus on a technical issue, which is to reliably determine the annihilation cross sections taking into account finite fermion masses. Following previous works in the framework of simplified supersymmetric dark matter scenarios, and building on an analogy with Higgs decay into fermions, we address the issue of infrared and collinear divergences that plagues the cross section by adopting an effective operator description, which captures most of the relevant physics and give explicit expressions for the annihilation cross sections. We then develop several approximations for the differential and total cross sections, which simplify greatly their expressions, and which can then be used in various phenomenological studies of similar models. Finally, we describe our method to compute the final gamma-ray spectrum, including hadronisation of the heavy fermions, and provide some illustrative spectra for specific dark matter candidates.

arXiv comment25 pages, 12 figures. One extra figure. Conclusions unchanged. Version published in PRD

References in corpus (26)

• An Introduction to PYTHIA 8.2
• CalcHEP 3.4 for collider physics within and beyond the Standard Model
• micrOMEGAs3.1 : a program for calculating dark matter observables
• Simplified Models for Dark Matter Searches at the LHC
• Fermi LAT Search for Internal Bremsstrahlung Signatures from Dark Matter Annihilation
• New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation
• Dark Matter at Colliders: a Model-Independent Approach
• Simplified Models vs. Effective Field Theory Approaches in Dark Matter Searches
• Scalar Dark Matter Models with Significant Internal Bremsstrahlung
• Signatures of Majorana dark matter with t-channel mediators
• Internal Bremsstrahlung Signature of Real Scalar Dark Matter and Consistency with Thermal Relic Density
• Internal bremsstrahlung signatures in light of direct dark matter searches
• Dark Matter Annihilation Signatures from Electroweak Bremsstrahlung
• Generic dark matter signature for gamma-ray telescopes
• Signatures from Scalar Dark Matter with a Vector-like Quark Mediator
• Top-philic Vector-Like Portal to Scalar Dark Matter
• Sharp Gamma-ray Spectral Features from Scalar Dark Matter Annihilations
• Bremsstrahlung in dark matter annihilation
• Top-philic Scalar Dark Matter with a Vector-like Fermionic Top Partner
• Electroweak and Higgs Boson Internal Bremsstrahlung: General considerations for Majorana dark matter annihilation and application to MSSM neutralinos
• Bremsstrahlung and Gamma Ray Lines in 3 Scenarios of Dark Matter Annihilation
• Baryon Asymmetry and Dark Matter Through the Vector-Like Portal
• A Reappraisal on Dark Matter Co-annihilating with a Top/Bottom Partner
• Heavy quark-philic scalar dark matter with a vector-like fermion portal
• One-loop corrections to gaugino (co-)annihilation into quarks in the MSSM
• Leading QCD Corrections for Indirect Dark Matter Searches: a Fresh Look

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• $Z_3$ Scalar Dark Matter with Strong Positron Fluxes
• Loop effect with vector mediator in the coherent neutrino-nucleus scattering
• t-channel dark matter at the LHC -- a whitepaper
• Contact interactions and top-philic scalar dark matter
• Loop effect in the coherent neutrino-nucleus scattering
• Top partners and scalar dark matter -- a non-minimal reappraisal