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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Very Light Axigluons and the Top Asymmetry
Speaker(s): Gordan Krnjaic
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.
Date: 12/12/2011 - 3:00 pm
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