Threshold Resummation Effects in Direct Top Quark Production at Hadron Colliders

Abstract

We investigate the threshold-enhanced QCD corrections to the cross sections for direct top quark productions induced by model-independent flavor changing neutral current couplings at hadron colliders. We use the soft-collinear effective theory to describe the incoming massless partons and use the heavy quark effective theory to treat the top quark. Then we construct the flavor changing operator based on the above effective theories, and resum the large logarithms near threshold arising from soft gluon emission. Our results show that the resummed QCD corrections further enhance the next-to-leading order cross sections significantly. Moreover, the resummation effects vastly reduce the dependence of the cross sections on the renormalization and factorization scales, especially in cases where the next-to-leading order results behave worse than the leading order results. Our results are more sensitive to the new physics effects. If signals of direct top quark production are found in future experiments, it is more appropriate to use our results as the theoretical inputs for extracting the anomalous couplings.

5 pages, 4 figures, use revtex4 and amsmath; version to appear in Phys. Rev. D

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Cited by in corpus (16)

• Top quark pair production at small transverse momentum in hadronic collisions
• Single Top-Quark Production in Flavor-Changing Z' Models
• Search for top-quark production via flavor-changing neutral currents in W+1 jet events at CDF
• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
• Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions
• Renormalization group improved predictions for $t\bar{t}{W}^{\pm }$ production at hadron colliders
• Status and Prospects of Top-Quark Physics
• Next-to-leading order QCD corrections to $tZ$ associated production via the flavor-changing neutral-current couplings at hadron colliders
• Next-to-leading order QCD corrections to the top quark decay via the Flavor-Changing Neutral-Current operators with mixing effects
• Next-to-leading order QCD corrections to the single top quark production via model-independent t-q-g flavor-changing neutral-current couplings at hadron colliders
• Review of Properties of the Top Quark from Measurements at the Tevatron
• Resummation prediction on top quark transverse momentum distribution at large pT
• Next-to-leading order QCD corrections to the top quark associated with $\gamma$ production via model-independent flavor-changing neutral-current couplings at hadron colliders
• Properties of the Top Quark
• Observation of Single Top Quark Production
• Threshold Resummation Effects in Neutral Higgs Boson Production by Bottom Quark Fusion at the CERN Large Hadron Collider