| Description |
The measurement of forward-backward (FB) asymmetry in the top and anti-top quark ($t \bar{t}$) production at Tevatron shows a more than $3\sigma$ deviation from the Standard Model (SM) prediction in the large $t \bar{t}$ invariant mass region. After mentioning the SM prediction for this asymmetry, I shall discuss odels with new Z$^{\prime}$ or W$^{\prime}$ bosons that have been invoked to explain this deviation. In the context of these models we perform a $\chi2$ analysis with all the available experimental numbers in different rapidity ($\Delta Y$) and $M_{t \bar{t}}$ bins. We find that for the $Z^{\prime}$ model the region of parameter space which explain the Tevatron asymmetry can be probed in the same sign top production channel by Tevatron itself. Moreover, we consider a recently proposed observable, the one sided forward-backward asymmetry ($A_{OFB}$) at the Large Hadron Collider (LHC) and conclude that both the W$^{\prime}$ and Z$^{\prime}$ models can lead to sizable $A_{OFB}$ even at the LHC running at a center of mass energy of 7 TeV for the model parameters consistent with the Tevatron measurements. In the end, I will briefly overview some of the other possible explanations of this FB-asymmetry anomaly of Tevatron.
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