A first estimate of the NNLO nonresonant corrections to top-antitop threshold production at lepton colliders

Abstract

We compute the dominant term in the expansion in rho=1-M_W/m_t of the unknown next-to-next-to-leading order (NNLO) nonresonant contributions to the e+ e- -> W+ W- b bbar total cross section at energies close to the top-antitop threshold. Our analytic result disagrees with a previous calculation by other authors [1]. We show that our determination has the correct infrared structure needed to cancel the divergences proportional to the top width arising in the resonant production of the same final state, and we point out to a missing contribution in the computation of [1] to explain the discrepancy.

5 pages, 3 figures

References in corpus (4)

• Four-fermion production near the W pair production threshold
• Ultrasoft contribution to heavy-quark pair production near threshold
• Electroweak non-resonant NLO corrections to e+ e- -> W+ W- b bbar in the t tbar resonance region
• P-wave contribution to third-order top-quark pair production near threshold

Cited by in corpus (7)

• Next-to-next-to-next-to-leading order QCD prediction for the top anti-top S-wave pair production cross section near threshold in e+ e- annihilation
• Near-threshold production of heavy quarks with QQbar_threshold
• Non-resonant and electroweak NNLO correction to the $e^{+}{e}^{-}$ top anti-top threshold
• Higgs effects in top anti-top production near threshold in e+ e- annihilation
• Fully-differential Top-Pair Production at a Lepton Collider: From Threshold to Continuum
• Non-relativistic high-energy physics: top production and dark matter annihilation
• Unstable-particle effective field theory