Non-factorizable effects in top quark production

Abstract

The production of top-antitop pairs at the Fermilab Tevatron shows a forward-backward asymmetry in which the top quark tends to follow the proton direction, while the antitop tends to follow the antiproton direction. The effect grows with increasing effective mass $m_{t\bar{t}}$ of the top-antitop pair, and with increasing rapidity difference between the top and antitop. The observed effect is about three times as large as predicted by next-to-leading-order QCD, but with the same sign. An estimate of non-factorizable effects based on a QCD string picture finds they are negligible, but that small distortions of the $m_t$ spectrum are possible. Tests for such effects, both at and above the level of this estimate, are suggested.

7 pages, 1 figure. Added text and references. Submitted to Phys. Rev. D

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• Lambda_c^+/Lambda_c^- and Lambda_b^0/\bar{Lambda}_b^0 production asymmetry at the LHC from heavy quark recombination
• Asymmetry in ${\Lambda }_b$ and ${\bar{\Lambda }}_b$ production
• Recent theoretical progress in top quark pair production at hadron colliders
• CDF Results on Heavy Quarks