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We investigate the indirect signatures of the Higgs portal $U(1)_X$ vectordark matter (VDM) $X_\mu$ from both its pair annihilation and decay. The VDM isstable at renormalizable level by $Z_2$ symmetry, and thermalized byHiggs-portal interactions. It can also decay by some nonrenormalizableoperators with very long lifetime at cosmological time scale. If dim-6operators for VDM decays are suppressed by $10^{16}$ GeV scale, the lifetime ofVDM with mass $\sim$ 2 TeV is just right for explaining the positron excess incosmic ray recent observed by PAMELA and AMS02 Collaborations. The VDM decayinginto $\mu^+ \mu^-$ can fit the data, evading various constraints on cosmicrays. We give one UV-complete model as an example. This scenario for Higgsportal decaying VDM with mass around $\sim2$ TeV can be tested by DM directsearch at XENON1T and at the future colliders by measuring the Higgsself-couplings.

Indirect and direct signatures of Higgs portal decaying vector dark matter for positron excess in cosmic rays