Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-27
Phys.Rev.D84:031701,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 4 figures; fig. 2 corrected, conclusions slightly changed, matches published version
Scientific paper
10.1103/PhysRevD.84.031701
We study in detail the model by Isidori and Kamenik that is claimed to explain the top quark forward-backward asymmetry at Tevatron, provide GeV-scale dark matter (DM), and possibly improve the agreement between data and theory in Tevatron W+jj events. We compute the DM thermal relic density, the spin-independent DM-nucleon scattering cross section, and the cosmic microwave background constraints on both Dirac and Majorana neutralino DM in the parameter space that explains the top asymmetry. A stable light neutralino is not allowed unless the local DM density is 3-4 times smaller than expected, in which case Dirac DM with mass around 3 GeV may be possible, to be tested by the Planck mission. The model predicts a too broad excess in the dijet distribution and a strong modification of the missing E_T distribution in W+jj events.
Hektor Andi
Hütsi Gert
Kadastik Mario
Kannike Kristjan
Raidal Martti
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