Two-Parton Contribution to the Heavy-Quark Forward-Backward Asymmetry in NNLO QCD

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dc.creatorBernreuther, W.
dc.creatorBonciani, R.
dc.creatorGehrmann, T.
dc.creatorLeineweber, R. Heinesch T.
dc.creatorMastrolia, P.
dc.creatorRemiddi, E.
dc.date2006-04-04
dc.date.accessioned2026-07-07T10:44:58Z
dc.date.available2026-07-07T10:44:58Z
dc.descriptionForward-backward asymmetries, $A_{FB}^Q$, are important observables for the determination of the neutral-current couplings of heavy quarks in inclusive heavy quark production, $e^+ e^- \to γ^*, Z^* \to Q +X$. In view of the measurement perspectives on $A_{FB}^Q$ at a future linear collider, precise predictions of $A_{FB}^Q$ are required for massive quarks. We compute the contribution of the $Q \bar Q$ final state to $A_{FB}^Q$ to order $\as^2$ in the QCD coupling. We provide general formulae, and we show that this contribution to $A_{FB}^Q$ is infrared-finite. We evaluate these two-parton contributions for $b$ and $c$ quarks on and near the $Z$ resonance, and for $t$ quarks above threshold. Moreover, near the $t \bar t$ threshold we obtain, by expanding in the heavy-quark velocity $β$, an expression for $A_{FB}^{t \bar t}$ to order $\as^2$ and NNLL in $β$. This quantity is equal, to this order in $β$, to the complete forward-backward asymmetry $A_{FB}^t$.
dc.descriptionlatex, 26 pages, 2 tables, 17 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0604031
dc.identifierhttp://arxiv.org/abs/hep-ph/0604031
dc.identifierNucl.Phys.B750:83-107,2006
dc.identifierdoi:10.1016/j.nuclphysb.2006.05.031
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182781
dc.subjectHigh Energy Physics - Phenomenology
dc.titleTwo-Parton Contribution to the Heavy-Quark Forward-Backward Asymmetry in NNLO QCD
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