Top quark forward-backward asymmetry at Tevatron and its implications at the LHC

Abstract

The measurement of forward-backward asymmetry in the top and anti-top quark ($t\bar{t}$) production has been recently reconfirmed by the CDF Collaboration and shows a more than $3\sigma$ deviation from the Standard Model(SM) prediction in the large $t\bar{t}$ invariant mass region. Models with new W${}^{\prime }$ or Z${}^{\prime }$ bosons have been invoked to explain this deviation. In the context of these models we perform a ${\chi }^2$ analysis with all the available experimental numbers in different $\Delta Y$ and $M_{t\bar{t}}$ bins. We show 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 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.

12 pages, 8 figures, discussions and references added, accepted for publication in Physical Review D (Rapid Communications)

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