Light colored scalars from grand unification and the forward-backward asymmetry in top quark pair production

Abstract

The experimental results on the t bar t production cross section at the Tevatron are well described by the QCD contributions within the standard model, while the recent measurement of the forward-backward asymmetry cannot be accounted for within this framework. We consider light colored scalars appearing in a particular SU(5) GUT model within the 45-dimensional Higgs representation. A virtue of the model is that it connects the presence of a light colored SU(2) singlet (Delta_6) and a color octet weak doublet (Delta_1) with bounds on the proton lifetime, which constrain the parameter space of both scalars. We find that both the t bar t production cross section and the forward-backward asymmetry can be accommodated simultaneously within this model. The experimental results prefer a region for the mass of Delta_6 around 400 GeV, while Delta_1 is then constrained to have a mass around the TeV scale as well. We analyze possible experimental signatures and find that Delta_6 associated top production could be probed in the t bar t + jets final states at Tevatron and the LHC.

12 pages, 13 figures, version as published

References in corpus (25)

• Updated predictions for the total production cross sections of top and of heavier quark pairs at the Tevatron and at the LHC
• First measurement of the forward-backward charge asymmetry in top quark pair production
• The theoretical top quark cross section at the Tevatron and the LHC
• Top quark forward-backward asymmetry from new t-channel physics
• Flavor Changing Neutral Currents, an Extended Scalar Sector, and the Higgs Production Rate at the LHC
• Axigluon as Possible Explanation for $p\bar{p}\to t\bar{t}$ Forward-Backward Asymmetry
• Top pair invariant mass distribution: a window on new physics
• Threshold Resummation for the Top Quark Charge Asymmetry
• Probing seesaw at LHC
• Top Quark Forward-Backward Asymmetry
• Explorations of the Top Quark Forward-Backward Asymmetry at the Tevatron
• Color-octet scalars at the LHC
• Renormalizable Adjoint SU(5)
• Theory and Phenomenology of Exotic Isosinglet Quarks and Squarks
• Heavy-quark pair production at two loops in QCD
• Proton decay matrix elements with domain-wall fermions
• Upper Bound on the Mass of the Type III Seesaw Triplet in an SU(5) Model
• Color Octet Scalar Production at the LHC
• Color Sextet Scalars at the CERN Large Hadron Collider
• Predictions from type II see-saw mechanism in SU(5)
• Can scalar leptoquarks explain the f_{D_s} puzzle?
• Unification versus proton decay in SU(5)
• Proton Stability, Dark Matter and Light Color Octet Scalars in Adjoint SU(5) Unification
• Grand Unification and Light Color-Octet Scalars at the LHC
• Factorization and resummation for single color-octet scalar production at the LHC

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• Longitudinal top polarization as a probe of a possible origin of forward-backward asymmetry of the top quark at the Tevatron
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• Forward-Backward t tbar Asymmetry from Anomalous Stop Pair Production
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• Massive Spin-2 States as the Origin of the Top Quark Forward-Backward Asymmetry
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