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Aidnogenesis via Leptogenesis and Dark Sphalerons

Mattias Blennow, Basudeb Dasgupta, Enrique Fernandez-Martinez, Nuria Rius

TL;DR

The paper investigates aidnogenesis, a mechanism that generates a dark matter asymmetry via new dark sphalerons tied to an extra non-Abelian gauge group, in tandem with leptogenesis. By solving chemical potential equilibrium with both SM and dark sphalerons, it shows that a linked $B$–$L$–$X$ asymmetry naturally yields a DM mass near the proton scale, predicting $m_{DM}\approx5.9$–$6$ GeV in a concrete $SU(2)_H\times SU(3)_{DC}$ model. The illustrative model predicts a DM mass of $m_{DM}=5.94\pm0.42$ GeV (with the option to shift toward $\sim9$ GeV if a DM generation is removed) and requires dark meson decays to erase the symmetric component before BBN, while offering explicit DM self-interaction consequences and potential links to DAMA/CoGeNT and Tevatron dimuon anomalies. The paper further discusses experimental constraints, direct-detection prospects (down to $\sigma\gtrsim10^{-46}$ cm$^2$) and collider FCNC signatures, outlining regions where the scenario could be tested in the near future.

Abstract

We discuss aidnogenesis, the generation of a dark matter asymmetry via new sphaleron processes associated to an extra non-abelian gauge symmetry common to both the visible and the dark sectors. Such a theory can naturally produce an abundance of asymmetric dark matter which is of the same size as the lepton and baryon asymmetries, as suggested by the similar sizes of the observed baryonic and dark matter energy content, and provide a definite prediction for the mass of the dark matter particle. We discuss in detail a minimal realization in which the Standard Model is only extended by dark matter fermions which form "dark baryons" through an SU(3) interaction, and a (broken) horizontal symmetry that induces the new sphalerons. The dark matter mass is predicted to be approximately 6 GeV, close to the region favored by DAMA and CoGeNT. Furthermore, a remnant of the horizontal symmetry should be broken at a lower scale and can also explain the Tevatron dimuon anomaly.

Aidnogenesis via Leptogenesis and Dark Sphalerons

TL;DR

The paper investigates aidnogenesis, a mechanism that generates a dark matter asymmetry via new dark sphalerons tied to an extra non-Abelian gauge group, in tandem with leptogenesis. By solving chemical potential equilibrium with both SM and dark sphalerons, it shows that a linked –– asymmetry naturally yields a DM mass near the proton scale, predicting – GeV in a concrete model. The illustrative model predicts a DM mass of GeV (with the option to shift toward GeV if a DM generation is removed) and requires dark meson decays to erase the symmetric component before BBN, while offering explicit DM self-interaction consequences and potential links to DAMA/CoGeNT and Tevatron dimuon anomalies. The paper further discusses experimental constraints, direct-detection prospects (down to cm) and collider FCNC signatures, outlining regions where the scenario could be tested in the near future.

Abstract

We discuss aidnogenesis, the generation of a dark matter asymmetry via new sphaleron processes associated to an extra non-abelian gauge symmetry common to both the visible and the dark sectors. Such a theory can naturally produce an abundance of asymmetric dark matter which is of the same size as the lepton and baryon asymmetries, as suggested by the similar sizes of the observed baryonic and dark matter energy content, and provide a definite prediction for the mass of the dark matter particle. We discuss in detail a minimal realization in which the Standard Model is only extended by dark matter fermions which form "dark baryons" through an SU(3) interaction, and a (broken) horizontal symmetry that induces the new sphalerons. The dark matter mass is predicted to be approximately 6 GeV, close to the region favored by DAMA and CoGeNT. Furthermore, a remnant of the horizontal symmetry should be broken at a lower scale and can also explain the Tevatron dimuon anomaly.

Paper Structure

This paper contains 7 sections, 8 equations, 1 figure, 1 table.

Table of Contents

  1. Introduction
  2. Aidnogenesis
  3. An illustrative model
  4. Constraints on the model
  5. Phenomenological prospects
  6. Summary and conclusions
  7. Acknowledgments

Figures (1)

  • Figure 1: Contours for the lower bound on $G_F^H$ such that the lifetime of the dark mesons is smaller than $10^{-2}$ s as a function of the dark meson mass $m_H$ and decay constant $f_H$. Left panel for a dominant decay into muons depicts the contours for $G_F^H > 10^{-9}$, $5 \cdot 10^{-10}$, $10^{-10}$ GeV$^{-2}$ and $5 \cdot 10^{-11}$ from the bottom of the plot to the top. Right panel for a dominant decay into a tau and a lighter lepton depicts the contours for $G_F^H > 10^{-10}$, $5 \cdot 10^{-11}$, $10^{-11}$ and $5 \cdot 10^{-12}$ GeV$^{-2}$ from the bottom of the plot to the top.