Title: Bottom-quark Forward-Backward Asymmetry, Dark Matter and the LHC
Speaker: Carlos Wagner, ANL & University of Chicago
Abstract: The LEP experiment at CERN provided accurate measurements of the Z neutral gauge boson properties. Although all measurements agree well with the SM predictions, the forward backward asymmetry of the bottom-quark remains almost 3σ away from the SM value. We proposed that this anomaly may be explained by the existence of a new U(1)D gauge boson, which couples with opposite charges to the right-handed components of the bottom and charm quarks. Cancellation of gauge anomalies demands the presence of a vector-like singlet charged lepton as well as a neutral Dirac (or Majorana) particle that provides a Dark Matter candidate. Constraints from precision measurements imply that the mass of the new gauge boson should be around 115 GeV. We discuss the phenomenological implications of this scenario.
Keywords: Physics, Astronomy, HEP