2022/03/31 by Deka, Kuldeep, Sadhukhan, Soumya, Singh, Manvinder Pal
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2203.17122
In this work, we explore the impact of dark matter (DM) relic density and direct detection constraints on a GeV scale DM in the context of recent anomalous muon magnetic moment (g-2)μ measurement; a 5.1 σ discrepancy with the SM. In U(1)Lμ-Lτ scenario the additional Z' boson modifies the (g-2)μ value readily explaining the discrepancy, which restricts the Z′ mass in the range of 20-200~MeV. Bounds imposed on the Z′ mass along with the gauge coupling, limit possible enhancement of the neutrino floor in an U(1)Lμ-Lτ model. Neutrino floor is enhanced for a lighter Z′ inside the (g-2)μ allowed parameter space, whereas for a heavier Z′, enhancement is less significant. The (g-2)μ constraint for the GeV scale Fermionic DM makes s-channel resonant annihilation insignificant, placing emphasis on a t-channel reliance to create the observed DM relic. Although a t-channel annihilation aided by relatively large couplings can explain the measured relic density, it increases the direct detection cross-section of the GeV DM. Consequently, super-GeV (with mass 1-10~GeV) DM almost gets ruled out except for a small parameter region with heavier Z′, whereas sub-GeV (with mass 0.1-1~GeV) DM detection possibility remains bright with more detection possibility for heavier Z′. In our analysis, we have discovered that direct detection constraints have a greater impact on the GeV DM compared to indirect detection measurements.