The forward-backward asymmetry of top quark production at the Tevatron in warped extra dimensional models
Résumé
The CDF and D0 experiments have reported on the measurement of the forward-backward asymmetry of top quark pair production at the Tevatron and the result is that it is more than 2 standard deviations above the predicted value in the Standard Model. This has to be added to the longstanding anomaly in the forward-backward asymmetry for bottom quark production at LEP which is 3 standard deviations different from the Standard Model value. In this note, we show that the two discrepancies can be accounted for by the contributions of Kaluza-Klein excitations of gauge bosons (gluons at the Tevatron and electroweak bosons at LEP) in warped extra dimensional models in which the fermions are localized differently along the extra dimension so that the gauge interactions of heavy third generation fermions are naturally different from that of light fermions.