Two Component Dark Matters in S_4 x Z_2 Flavor Symmetric Extra U(1) Model

TL;DR

This paper proposes a model with two dark matter components, explaining cosmic-ray anomalies via long-lived flavons and neutralinos, with specific parameter choices aligning with observed positron flux and Higgs mass constraints.

Contribution

It introduces a flavor symmetric U(1) model with two dark matter components, addressing cosmic-ray anomalies and particle mass constraints.

Findings

Long-lived flavon contributes to dark matter density.

Neutralino accounts for dominant dark matter component.

Model explains positron excess without anti-proton excess.

Abstract

We study cosmic-ray anomaly observed by PAMELA based on E_6 inspired extra U(1) model with S_4 x Z_2 flavor symmetry. In our model, the lightest flavon has very long lifetime of O(10^{18)) second which is longer than the age of the universe, but not long enough to explain the PAMELA result ~ O(10^{26}) sec. Such a situation could be avoidable by considering that the flavon is not the dominant component of dark matters and the dominant one is the lightest neutralino. With appropriate parameter set, density parameter of dark matter and over-abundance of positron flux in cosmic-ray are realized at the same time. There is interesting correlation between spectrum of positron flux and V_{MNS}. No excess of anti-proton in cosmic-ray suggests that sfermions are heavier than 4 TeV and the masses of the light Higgs bosons are degenerated.