Forward-Backward Asymmetry of Top Quark Pair Production

Abstract

We adopt a Markov Chain Monte Carlo method to examine various new physics models which can generate the forward-backward asymmetry in top quark pair production observed at the Tevatron by the CDF Collaboration. We study the following new physics models: (1) exotic gluon $G^{\prime }$, (2) extra $Z^{\prime }$ boson with flavor-conserving interaction, (3) extra $Z^{\prime }$ with flavor-violating $u$-$t$-$Z^{\prime }$ interaction, (4) extra $W^{\prime }$ with flavor-violating $d$-$t$-$W^{\prime }$ interaction, and (5) extra scalars $S$ and $S^{\pm }$ with flavor-violating $u$-$t$-$S$ and $d$-$t$-$S^{\pm }$ interactions. After combining the forward-backward asymmetry with the measurement of the top pair production cross section and the $t\bar{t}$ invariant mass distribution at the Tevatron, we find that an axial vector exotic gluon $G^{\prime }$ of mass about $1\mathrm{TeV}$ or $2\mathrm{TeV}$ or a $W^{\prime }$ of mass about $2\mathrm{TeV}$ offer an improvement over the Standard Model. The other models considered do not fit the data significantly better than the Standard Model. We also emphasize a few points which have been long ignored in the literature for new physics searches: (1) heavy resonance width effects, (2) renormalization scale dependence, and (3) NLO corrections to the $t\bar{t}$ invariant mass spectrum. We argue that these three effects are crucial to test or exclude new physics effects in the top quark pair asymmetry.

46 pages, 20 figures

References in corpus (16)

• Implications of CTEQ global analysis for collider observables
• Measuring the running top-quark mass
• 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 Quarks, Axigluons and Charge Asymmetries at Hadron Colliders
• Neutral B Meson Mixing in Unquenched Lattice QCD
• Threshold Resummation for the Top Quark Charge Asymmetry
• Constraining heavy colored resonances from top-antitop quark events
• Top quark forward-backward asymmetry at the Tevatron: a comparative study in different new physics models
• Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders
• Heavy-quark pair production at two loops in QCD
• Spin Dependence of Dark Matter Scattering
• Model Independent Constraints Among the Wtb, Zbb, and Ztt Couplings
• Chiral color symmetry and possible $G^{\prime }$-boson effects at the Tevatron and LHC
• Extra Gauge Invariance from an Extra Dimension

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