Very Light Axigluons and the Top Asymmetry

Details Very Light Axigluons and the Top Asymmetry Very Light Axigluons and the Top Asymmetry

2011-09-03

arxiv.org/abs/1109.0648v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures, references added, discussion of constraints expanded, general conclusions unchanged

Scientific paper

We show that very light (50 - 90 GeV) axigluons with flavor-universal couplings of order g_{s}/3 may explain the anomalous top forward-backward asymmetry reported by both CDF and D0 collaborations. The model is naturally consistent with the observed t \bar t invariant mass distribution and evades bounds from light Higgs searches, LEP event shapes, and hadronic observables at the Z pole. Very light axigluons can appear as resonances in multijet events, but searches require sensitivity to masses below current limits.

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