Model independent analysis of the forward-backward asymmetry of top quark production at the Tevatron

摘要

Motivated by a possible anomaly in the forward-backward (FB) asymmetry of top quark (AFB) observed at the Tevatron, we perform a model independent analysis on qq →tt using an effective Lagrangian with dim-6 four-quark operators. We derive necessary conditions on new physics structures and the couplings that are consistent with the tt production cross section and AFB measured at the Tevatron, and discuss possible new physics scenarios that could generate such dim-6 operators.