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• W2752738079 abstract "We study Dirac fermionic dark matter (DM, $chi^0$) and confront it with recent data. To evade the stringent direct search limits from PandaX-II, XENON1T and LUX experiments, the quantum numbers of the Dirac DM are taken to be $I_3=Y=0$ to remove the tree-level $Z$-exchange diagram. Loop amplitudes can contribute to the elastic scattering cross section. We find that there are cancellations in the one-loop diagrams, which largely reduce the cross section and make the Dirac DM viable in the direct search. For a generic isospin $I$, we survey the Dirac DM mass constrained by the latest results of PandaX-II, XENON1T and LUX experiments, the observed DM relic density, and the H.E.S.S. and the Fermi-LAT astrophysical observations. Sommerfeld enhancement effects on DM annihilation processes are investigated. We find that the cross section of $chi^0barchi^0$ annihilating to the standard model (SM) gauge bosons are in general significantly enhanced, and the Fermi-LAT, the H.E.S.S. upper limits on $langlesigma vrangle({W^+W^-,gammagamma})$ and the observed relic density become serious constraints on the Dirac DM mass. The $I<4$ cases are ruled out and for $Igeq 4$, the lower bound on Dirac DM mass are forced to be $gtrsim$ 60 TeV. The elastic scattering cross section for $m_chi$ of few tens TeV with a generic $I$ is found to be $sigma^{SI}simeq I^2(I+1)^2times7times10^{-49}$~cm$^2$. The predicted $langlesigma (chi^0barchi^0to Z^0Z^0, Z^0gamma, gammagamma)vrangle$ and $sigma^{SI}$ are sizable and they will be useful to search for DM in astrophysical observation and in direct search in near future." @default.
• W2752738079 created "2017-09-15" @default.
• W2752738079 creator A5001987363 @default.
• W2752738079 creator A5060823060 @default.
• W2752738079 date "2017-12-14" @default.
• W2752738079 modified "2023-10-14" @default.
• W2752738079 title "Confronting Dirac fermionic dark matter with recent data" @default.
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• W2752738079 doi "https://doi.org/10.1103/physrevd.96.115006" @default.
• W2752738079 hasPublicationYear "2017" @default.
• W2752738079 type Work @default.

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