A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess
Due to the strong constraint from the LUX experiment, the scalar portal dark matter cannot generally explain a gamma-ray excess in the galactic center by the annihilation of dark matter to bb¯. With the motivation of eliminating the tension, we add a scalar dark matter to the aligned two-Higgs-doubl...
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doaj-7d81b90542784bd7bdd4b5e8ba9091572020-11-24T23:01:28ZengElsevierPhysics Letters B0370-26932014-12-01739416420A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excessLei Wang0Xiao-Fang Han1Department of Physics, Yantai University, Yantai 264005, ChinaCorresponding author.; Department of Physics, Yantai University, Yantai 264005, ChinaDue to the strong constraint from the LUX experiment, the scalar portal dark matter cannot generally explain a gamma-ray excess in the galactic center by the annihilation of dark matter to bb¯. With the motivation of eliminating the tension, we add a scalar dark matter to the aligned two-Higgs-doublet model, and focus on a simplified scenario, which has two main characteristics: (i) The heavy CP-even Higgs is the discovered 125 GeV Higgs boson, which has the same couplings to the gauge bosons and fermions as the SM Higgs. (ii) Only the light CP-even Higgs mediates the dark matter interactions with SM particles, which have no couplings to WW and ZZ, but have the independent couplings to the up-type quarks, down-type quarks and charged leptons. We find that the tension between 〈σv〉SS→bb¯ and the constraint from LUX induced by the scalar portal dark matter can go away for the isospin-violating dark matter–nucleon coupling with −1.0<fn/fp<0.7, and the constraints from the Higgs search experiments and the relic density of Planck are also satisfied.http://www.sciencedirect.com/science/article/pii/S0370269314008181 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lei Wang Xiao-Fang Han |
spellingShingle |
Lei Wang Xiao-Fang Han A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess Physics Letters B |
author_facet |
Lei Wang Xiao-Fang Han |
author_sort |
Lei Wang |
title |
A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess |
title_short |
A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess |
title_full |
A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess |
title_fullStr |
A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess |
title_full_unstemmed |
A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess |
title_sort |
simplified 2hdm with a scalar dark matter and the galactic center gamma-ray excess |
publisher |
Elsevier |
series |
Physics Letters B |
issn |
0370-2693 |
publishDate |
2014-12-01 |
description |
Due to the strong constraint from the LUX experiment, the scalar portal dark matter cannot generally explain a gamma-ray excess in the galactic center by the annihilation of dark matter to bb¯. With the motivation of eliminating the tension, we add a scalar dark matter to the aligned two-Higgs-doublet model, and focus on a simplified scenario, which has two main characteristics: (i) The heavy CP-even Higgs is the discovered 125 GeV Higgs boson, which has the same couplings to the gauge bosons and fermions as the SM Higgs. (ii) Only the light CP-even Higgs mediates the dark matter interactions with SM particles, which have no couplings to WW and ZZ, but have the independent couplings to the up-type quarks, down-type quarks and charged leptons. We find that the tension between 〈σv〉SS→bb¯ and the constraint from LUX induced by the scalar portal dark matter can go away for the isospin-violating dark matter–nucleon coupling with −1.0<fn/fp<0.7, and the constraints from the Higgs search experiments and the relic density of Planck are also satisfied. |
url |
http://www.sciencedirect.com/science/article/pii/S0370269314008181 |
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