Abstract
We study gamma-ray line signatures from electroweakly interacting non-abelian spin-1 dark matter (DM). In this model, Z2-odd spin-1 particles including a DM candidate have the SU(2)L triplet-like features, and the Sommerfeld enhancement is relevant in the annihilation processes. We derive the annihilation cross sections contributing to the photon emission and compare with the SU(2)L triplet fermions, such as Wino DM in the supersymmetric Standard Model. The Sommerfeld enhancement factor is approximately the same in both systems, while our spin-1 DM predicts the larger annihilation cross sections into γγ/Zγ modes than those of the Wino by frac{38}{9} . This is because a spin-1 DM pair forms not only J = 0 but also J = 2 partial wave states where J denotes the total spin angular momentum. Our spin-1 DM also has a new annihilation mode into Z2-even extra heavy vector and photon, Z′γ. For this mode, the photon energy depends on the masses of DM and the heavy vector, and thus we have a chance to probe the mass spectrum. The latest gamma-ray line search in the Galactic Center region gives a strong constraint on our spin-1 DM. We can probe the DM mass for ≲ 25.3 TeV by the Cherenkov Telescope Array experiment even if we assume a conservative DM density profile.
Highlights
We study gamma-ray line signatures from electroweakly interacting nonabelian spin-1 dark matter (DM)
The Minimal Supersymmetric SM predicts concrete DM candidates stabilized by the symmetry called R-parity, which is studied in many contexts [7,8,9,10]
The derived constraints highly depend on the DM density profiles, and we show our result by taking some types of benchmark profiles to show the uncertainty
Summary
We study the gamma-ray line signatures from the electroweakly interacting non-abelian vector DM model. Since our DM has the SU(2)L triplet-like features, the Sommerfeld enhancement factor is almost the same as that for the pure Wino DM. The predicted annihilation cross sections into γγ/Zγ are larger by 38. The gamma-ray line signals provide stronger constraints on our spin-1 DM compared with the Wino DM. We show the constraints on the line cross section for the γγ, Zγ, and Z 0 γ modes by the. We may observe a double-peak in the gamma-ray energy spectrum, which provides a unique signature of our spin-1 DM. The annihilation into Z 0 γ gives a strong constraint for mV ' mZ 0 where couplings between DM and Z 0 are enhanced
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