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 t) production has been recently reconfirmed by the CDF Collaboration and shows a more than 3σ deviation from the Standard Model(SM) prediction in the large t t invariant mass region. Models with new W or Z bosons have been invoked to explain this deviation. In the context of these models we perform a 2 analysis with all the available experimental numbers in different Y and Mt t bins. We show that for the Z 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 (AOFB) at the LHC and conclude that both the W and Z models can lead to sizable AOFB even at the LHC running at a center of mass energy of 7 TeV for the model parameters consistent with the Tevatron measurements.