New interpretation of the recent result of AMS-02 and multi-component decaying dark matters with non-Abelian discrete flavor symmetry

Kajiyama, Yuji; Okada, Hiroshi; Toma, Takashi

Abstract

Recently the AMS-02 experiment has released the data of positron fraction with a very small statistical error. Because of the small error, it is no longer easy to fit the data with single dark matter for a fixed diffusion model and dark matter profile. In this paper, we propose a new interpretation of the data: that it originates from decay of two-component dark matter. This interpretation gives a rough threshold of the lighter DM component. When DM decays into leptons, the positron fraction in the cosmic rays depends on the flavor of the final states, and this is fixed by imposing a non-Abelian discrete symmetry on our model. By assuming two gauge-singlet fermionic decaying DM particles, we show that a model with non-Abelian discrete flavor symmetry, e.g. T13 , can give a much better fitting to the AMS-02 data compared with a single-component dark matter scenario. Few dimension-six operators of the universal leptonic decay of DM particles are allowed in our model, since its decay operators are constrained by the T13 symmetry. We also show that the lepton masses and mixings are consistent with current experimental data, due to the flavor symmetry.

Citation

Kajiyama, Y., Okada, H., & Toma, T. (2014). New interpretation of the recent result of AMS-02 and multi-component decaying dark matters with non-Abelian discrete flavor symmetry. The European Physical Journal C, 74(2), Article 2722. https://doi.org/10.1140/epjc/s10052-014-2722-9

• Journal Article Type: Article
• Online Publication Date: Feb 5, 2014
• Publication Date: Feb 28, 2014
• Deposit Date: Apr 18, 2019
• Publicly Available Date: Apr 18, 2019
• Journal: European Physical Journal C: Particles and Fields
• Print ISSN: 1434-6044
• Electronic ISSN: 1434-6052
• Publisher: SpringerOpen
• Peer Reviewed: Peer Reviewed
• Volume: 74
• Issue: 2
• Article Number: 2722
• DOI: https://doi.org/10.1140/epjc/s10052-014-2722-9
• Public URL: https://durham-repository.worktribe.com/output/1332834