Direct detection and CMB constraints on light DM scenario of top quark asymmetry and dijet excess at Tevatron

Abstract

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.

4 pages, 4 figures; fig. 2 corrected, conclusions slightly changed, matches published version

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Cited by in corpus (10)

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• Quirks at the Tevatron and Beyond
• Z'-gauge Bosons as Harbingers of Low Mass Strings
• Top A_FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets
• Model independent analysis of top quark forward-backward asymmetry at the Tevatron up to $\mathcal{O}(\as^2/Λ^2)$
• Top quark forward-backward asymmetry and W^prime bosons
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
• Next-to-leading order QCD effect of $W^{\prime }$ on top quark Forward-Backward Asymmetry
• Interpretations and Implications of the Top Quark Rapidity Asymmetries $A_{FB}^t$ and $A_{FB}^{\ell }$
• Tracking Down the Top Quark Forward-Backward Asymmetry with Monotops