Top A FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets

Abstract

We consider the top forward–backward (FB) asymmetry at the Tevatron and top charge asymmetry at the LHC within chiral U(1)′ models with flavor-dependent U(1)′ charges and flavored Higgs fields, which were introduced in Ko et al. (J. High Energy Phys. 1201:147, 2012). In this model, one has to include the flavor-changing couplings of the Higgs bosons as well as the Z′ to the up-type quarks. The models could enhance not only the top forward–backward asymmetry at the Tevatron, but also the top charge asymmetry at LHC, without too large same-sign top-quark pair production rates. Also the \(m_{t\bar{t}}\) distribution at high \(m_{t\bar{t}}\) shows less deviations from the SM predictions. We identify parameter spaces for the U(1)′ gauge boson and (pseudo) scalar Higgs bosons where all the experimental data could be accommodated, including the case with about 125 GeV Higgs boson, as suggested recently by ATLAS and CMS.