Very Light Axigluons and the Top Asymmetry

Abstract

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.

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

References in corpus (15)

• PYTHIA 6.4 Physics and Manual
• FeynRules - Feynman rules made easy
• Theoretical status and prospects for top-quark pair production at hadron colliders
• Updated predictions for the total production cross sections of top and of heavier quark pairs at the Tevatron and at the LHC
• The theoretical top quark cross section at the Tevatron and the LHC
• Top Quarks, Axigluons and Charge Asymmetries at Hadron Colliders
• Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders
• Axigluons cannot explain the observed top quark forward-backward asymmetry
• Leptons and photons at the LHC: cascades through spinless adjoints
• Top-Quark Forward-Backward Asymmetry in Randall-Sundrum Models Beyond the Leading Order
• New Color-Octet Vector Boson Revisit
• Constraining Light Colored Particles with Event Shapes
• Gluon excitations in t tbar production at hadron colliders
• Study of Triple-Gauge-Boson Couplings ZZZ, ZZgam and Zgamgam at LEP
• Search for neutral Higgs bosons in multi-$b$-jet events in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV

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• Bottom-Quark Forward-Backward Asymmetry in the Standard Model and Beyond
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• Renormalization group-induced phenomena of top pairs from four-quark effective operators
• Next-to-leading order QCD effect of $W^{\prime }$ on top quark Forward-Backward Asymmetry
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• Ultraviolet Completions of Axigluon Models and Their Phenomenological Consequences
• Quantum coherence, top transverse polarisation and the Tevatron asymmetry $A_{FB}^{\ell }$
• Top quark physics in the Vector Color-Octet Model
• Light Axigluon Contributions to b-bbar and c-cbar Asymmetry and Constraints on Flavor Changing Axigluon Currents
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