Forward-backward asymmetry in top quark production from light colored scalars in SO(10) model

Abstract

The forward-backward asymmetry in top pair production at Tevatron has been reconfirmed by the CDF collaboration with 5.3 fb^{-1} of accumulated data. These measurements also report that the asymmetry is the largest in regions of high invariant mass M_{t\bar{t}} and rapidity difference |ΔY|. We consider light colored sextet scalars appearing in a particular non-supersymmetric \10 grand unification model within the \bar{126} scalar representation. These scalar states have masses in the range of 300 \text{GeV}-2 \text{TeV} consistent with the requirements of gauge coupling unification and bounds on the proton lifetime. The cross section and the total asymmetry can be simultaneously explained with the contributions of these scalars within 1$\sigma$. We find that the simultaneous fitting of the cross section, the total asymmetry and the asymmetries in different rapidity and M_{t\bar{t}} bins gives only a marginal improvement over the SM contribution. We also study various production mechanisms of these colored sextet scalars at the LHC.

22 pages, 11 Figures, References added, Section III and V modified. Version accepted for publication in JHEP

References in corpus (5)

• First measurement of the forward-backward charge asymmetry in top quark pair production
• First Measurement of the Ratio sigma_(t-tbar) / sigma_(Z/γ*->ll) and Precise Extraction of the t-tbar Cross Section
• Top-Quark Forward-Backward Asymmetry in Randall-Sundrum Models Beyond the Leading Order
• Tevatron Asymmetry of Tops in a W',Z' Model
• Forward-backward asymmetry of top quark in unparticle physics

Cited by in corpus (5)

• Probing the Tevatron t tbar asymmetry at LHC
• Top quark asymmetry from a non-Abelian horizontal symmetry
• Higgs Uncovering Light Scalar Remnants of High Scale Matter Unification
• Massive Spin-2 States as the Origin of the Top Quark Forward-Backward Asymmetry
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics