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Top Quark Mediated Dark Matter · Around

2012

Top Quark Mediated Dark Matter

Zhang, Yue

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We study the top quark portal dominated dark matter interactions, and its implications for the gamma ray line searches.

In this picture, the dark matter interactions with photons and gluons are loop induced by the axial anomaly of the top quark current.
We show there can be a natural suppression of the tree-level annihilation of dark matter, and the photon channel in turn has a substantial rate when the main annihilation proceeds into gluons.
We observe a competition between the indirect detection of gamma ray line and the search with monojet plus missing energy events at LHC, and the 7 TeV data already set an upper bound of ~ 10^{-28} cm^3/s on the photonic annihilation cross section.

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L. Feng, Q. Yuan and Y. -Z. Fan, arXiv:1206.4758 [astro-ph.HE]; T. Cohen, M. Lisanti, T. R. Slatyer and J. G. Wacker, JHEP 1210
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