2011

On Models of New Physics for the Tevatron Top A_FB

Gresham, Moira I., Kim, Ian-Woo, Zurek, Kathryn M.

Understand

CDF has observed a top forward-backward asymmetry discrepant with the Standard Model prediction at 3.4 \sigma.

We analyze models that could generate the asymmetry, including flavor-violating W's, horizontal Z'_Hs, triplet and sextet diquarks, and axigluons.
We consider the detailed predictions of these models for the invariant mass and rapidity distributions of the asymmetry at the parton level, comparing against the unfolded parton-level CDF results.
While all models can reproduce the asymmetry with the appropriate choice of mass and couplings, it appears at first examination that the extracted parton-level invariant mass distribution for all models are in conflict with Tevatron observations.

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