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Recently Nelson et al. proposed an interesting flavor symmetric model toaccount for the top quark forward-backward asymmetry and the dijet anomaly atCDF simultaneously with just three parameters: a coupling constant of orderone, and two scalar masses of 160 GeV and 220 GeV. However these fiducialvalues of the parameters lead to the branching ratio of a almost pure penguin B-> pi K decay about one hundred times larger than the experimental results.Consider also the precision electroweak constraints, the scalar masses shouldbe at least around 500 GeV. Actually with the coupling constant larger thanone, it is impossible to explain either of the two CDF measurementsconsistently in this model. But one may raise the charged scalar mass to, forexample, 250 GeV and reduce the coupling strength to 0.6 to meet the B physicsconstraints. With this parameter set, the Wjj cross section is found to be inthe right range. But due to the scalar mass splitting, its correction toT-parameter is about 3 sigma away from the precision electroweak constraints.In addition, the top quark forward-backward asymmetry should be well below 0.1with this small coupling constant.

B physics constraints on a flavor symmetric scalar model to account for the ttbar asymmetry and Wjj excess at CDF