Muon g - 2 and Galactic Centre γ-ray excess in a scalar extension of the 2HDM type-X
- National Institute of Chemical Physics and Biophysics, Rävala pst. 10, Tallinn, 10143 Estonia (Estonia)
We consider an extension of the lepto-specific 2HDM with an extra singlet S as a dark matter candidate. Taking into account theoretical and experimental constraints, we investigate the possibility to address both the γ-ray excess detected at the Galactic Centre and the discrepancy between the Standard Model prediction and experimental results of the anomalous magnetic moment of the muon. Our analyses reveal that the SS → τ{sup +} τ{sup −} and SS → b b-bar channels reproduce the Galactic Centre excess, with an emerging dark matter candidate which complies with the bounds from direct detection experiments, measurements of the Higgs boson invisible decay width and observations of the dark matter relic abundance. Addressing the anomalous magnetic moment of the muon imposes further strong constraints on the model. Remarkably, under these conditions, the SS → b b-bar channel still allows for the fitting of the Galactic Centre. We also comment on a scenario allowed by the model where the SS → τ{sup +} τ{sup −} and SS → b b-bar channels have comparable branching ratios, which possibly yield an improved fitting of the Galactic Centre excess.
- OSTI ID:
- 22525252
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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