High Energy Positrons and Gamma Radiation from Decaying Constituents of a two-component Dark Atom Model

Abstract

We study a two component dark matter candidate inspired by the Minimal Walking Technicolor model. Dark matter consists of a dominant SIMP-like dark atom component made of bound states between primordial helium nuclei and a doubly charged technilepton, and a small WIMP-like component made of another dark atom bound state between a doubly charged technibaryon and a technilepton. This scenario is consistent with direct search experimental findings because the dominant SIMP component interacts too strongly to reach the depths of current detectors with sufficient energy to recoil and the WIMP-like component is too small to cause significant amount of events. In this context a metastable technibaryon that decays to $e^{+}{e}^{+}$, ${\mu }^{+}{\mu }^{+}$ and ${\tau }^{+}{\tau }^{+}$ can in principle explain the observed positron excess by AMS-02 and PAMELA, while being consistent with the photon flux observed by FERMI/LAT. We scan the parameters of the model and we find the best possible fit to the latest experimental data. We find that there is a small range of parameter space that this scenario can be realised under certain conditions regarding the cosmic ray propagation and the final state radiation. This range of parameters fall inside the region where the current run of LHC can probe, and therefore it will soon be possible to either verify or exclude conclusively this model of dark matter.

11 pages, 4 figures, invited contribution to the special issue "Composite dark matter" of International Journal of Modern Physics D. arXiv admin note: text overlap with arXiv:1411.3657

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Cited by in corpus (11)

• Search for heavy long-lived multi-charged particles in proton-proton collisions at $\sqrt{s}$ = 13 TeV using the ATLAS detector
• Late decaying 2-component dark matter scenario as an explanation of the AMS-02 positron excess
• Leptophilic-portal Dark Matter in the Light of AMS-02 positron excess
• Low-Temperature Enhancement of Semi-annihilation and the AMS-02 Positron Anomaly
• Search for heavy long-lived multi-charged particles in the full LHC Run 2 $pp$ collision data at $\sqrt{s}$ = 13 TeV using the ATLAS detector
• Wormhole as a possible accelerator of high-energy cosmic-ray particles
• Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario
• Scale-Invariant Two Component Dark Matter
• Proposition of FSR Photon Suppression Employing a Two-Positron Decay Dark Matter Model to Explain Positron Anomaly in Cosmic Rays
• Observational constraints on dark matter decaying via gravity portals
• On Quantum and Classical Treatments of Radiative Recombination