Abstract
We present an analytic description of top-antitop pair production near the threshold in e + e − annihilation and γγ collisions. A set of basic observables being considered includes total cross sections, forward-backward asymmetry, and top-quark polarization. Threshold effects relevant to the basic observables are described by three universal functions related to S-wave production, P-wave production, and S-P interference. These functions are computed analytically up to the next-to-next-to-leading order of NRQCD. The total \(e^ + e^ - \to \overline {tt} \) cross section near the threshold is obtained in the next-to-next-to-leading order in a closed form including the contribution originating from the axial coupling of top quarks that is mediated by the Z boson. The effects of the running of the strong coupling constant and the finite top-quark width are taken into account analytically for the P-wave production and S-P wave interference.
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From Yadernaya Fizika, Vol. 64, No. 2, 2001, pp. 323–341.
Original English Text Copyright © 2001 by Penin, Pivovarov.
This article was submitted by authors in English.
on leave of absence from the Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312 Russia.
on leave of absence from the Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312 Russia.
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Penin, A.A., Pivovarov, A.A. Analytic results for \(e^ + e^ - \to \overline {tt} \) and \(\gamma \gamma \to \overline {tt} \) observables near the threshold up to the next-to-next-to-leading order of NRQCD. Phys. Atom. Nuclei 64, 275–293 (2001). https://doi.org/10.1134/1.1349450
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DOI: https://doi.org/10.1134/1.1349450