Abstract

We propose an extension to the Standard Model accommodating two families of Dirac neutral fermions and Majorana fermions under additional ${U(1)_{e-\mu} \times Z_3\times Z_2}$ symmetries where ${U(1)_{e-\mu}}$ is a flavor dependent gauge symmetry related to the first and second family of the lepton sector, which features a two-loop induced neutrino mass model. The two families are favored by minimally reproducing the current neutrino oscillation data and two mass difference squares and canceling the gauge anomalies at the same time. As a result, we have a prediction for neutrino masses. The lightest Dirac neutral fermion is a dark matter candidate with tree-level interaction restricted to electron, muon and neutrinos, which makes it difficult to detect in direct dark matter search as well as indirect search focusing on the ${\tau}$-channel, such as through ${\gamma}$-rays. It may however be probed by search for dark matter signatures in electron and positron cosmic rays, and allows interpretation of a structure appearing in the CALET electron+positron spectrum around 350-400 GeV as its signature, with a boost factor $\approx$40 Breit-Wigner enhancement of the annihilation cross section.

Highlights

  • We show that Breit-Wigner enhancement may lead to a significant boost factor (B) on the annihilation cross section, which may increase the signatures to the level detectable by current indirect dark matter (DM) search

  • We have shown the viability of a GeV-TeV range WIMPlike DM candidate featuring flavor-dependent interaction only with electron and muon, allowed by current constraints from direct and indirect detection

  • The DM candidate is predicted in the framework of a scotogenic model at two-loop level, where we have accommodated two families of Dirac neutral fermions and Majorana fermions under gauge Uð1Þe−μ × Z3 × Z2

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Summary

INTRODUCTION

The cosmological standard model includes dark matter (DM) as an essential component, commonly considered to be a neutral particle not part of the standard model of. This paper is organized as follows: In Sec. II, we explain our particle physics scenario and formulate the lepton sector and the Higgs potential, the masses and mixings for the two new fermions and the active neutrinos, and the mass of the new gauge boson and its interactions, discussing LFVs. In Sec. III, we will discuss our DM candidate, in which we briefly explain why it is not subject to current bounds from direct detection searches, and explain calculation of the DM relic density.

PARTICLE PHYSICS MODEL
Particle contents and Lagrangian
Active neutrino mass
Lepton flavor violations
Benchmark point
PROPERTIES OF DARK MATTER PARTICLES
Direct detection
Relic density
Numerical analysis
DARK MATTER SIGNATURES IN COSMIC-RAY SPECTRA
Electron and positron flux from annihilation in the galactic halo
Astrophysical background flux model
Fit of the background model to CALET and AMS-02 data
Limit on annihilation cross section from CALET and AMS-02 data
Structures in the CALET spectrum as possible dark matter signatures
SUMMARY AND CONCLUSIONS

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