Constraining the co-genesis of Visible and Dark Matter with AMS-02 and Xenon-100

TL;DR

This paper proposes a non-thermal two-Higgs doublet model with U(1)_{B-L} symmetry where decaying dark matter explains AMS-02 positron excess, consistent with Xenon-100 constraints and a B-L scale of 2-4 TeV.

Contribution

It introduces a novel non-thermal mechanism linking visible and dark matter production with testable predictions in cosmic ray and direct detection experiments.

Findings

Dark matter decay explains AMS-02 positron excess.

Parameter space constrained by Xenon-100 and relic abundance.

B-L symmetry breaking scale around 2-4 TeV is favored.

Abstract

We study a non-thermal scenario in a two-Higgs doublet extension of the standard model (SM), augmented by an U(1)_{\rm B-L} gauge symmetry. In this set up, it is shown that the decay product of a weakly coupled scalar field just above the electroweak scale can generate visible and dark matter (DM) simultaneously. The DM is unstable because of the broken B-L symmetry. The lifetime of DM (\approx 5\times 10^{25} sec) is found to be much longer than the age of the Universe, and its decay to the SM leptons at present epoch can explain the positron excess observed at the AMS-02. The relic abundance and the direct detection constraint from Xenon-100 can rule out a large parameter space just leaving the $B-L$ breaking scale around \approx 2 - 4 TeV.