Very Light Axigluons and the Top Asymmetry

          @misc{ scivideos_PIRSA:11120063,
            doi = {10.48660/11120063},
            url = {https://pirsa.org/11120063},
            author = {Krnjaic, Gordan},
            keywords = {Particle Physics},
            language = {en},
            title = {Very Light Axigluons and the Top Asymmetry},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2011},
            month = {dec},
            note = {PIRSA:11120063 see, \url{https://scivideos.org/index.php/pirsa/11120063}}
          }
          

Abstract

Both Tevatron experiments have recently reported an anomalous forward-backward asymmetry in top-antitop production. Their inclusive results are roughly 3 standard deviations larger than the standard model prediction and may be evidence of new physics that couples to the top quark. In this talk, I will present a weakly-coupled light axigluon model (< Mtop) with flavor universal couplings as a possible explanation. Surprisingly,a particle with these properties can generate a large ttbar asymmetry with model-parameters safe from dijet resonance searches, flavor changing neutral currents, and constraints from the Z pole.