Next-to-leading-logarithmic QCD Corrections to the Cross Section sigma(e+e- to t bar t H) at 500 GeV

Abstract

We determine the next-to-leading logarithmic (NLL) QCD corrections to the cross section sigma(e+e- to t bar t H) for center-of-mass energies up to 500 GeV. The dynamics is dominated by nonrelativistic effects, and the summation of terms singular in the relative t bar t velocity is mandatory to all orders in the strong coupling constant alpha_s using an effective theory. The summations lead to an enhancement of the tree level predictions by about a factor of two and are important for the determination of the top Yukawa coupling. We also study the impact of polarization of the electron-positron beams and provide a fast approximation formula for the known O(alpha_s) QCD fixed-order prediction.

18 pages, 3 tables, 5 figures

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Cited by in corpus (12)

• Physics at the e+ e- Linear Collider
• Determining the CP properties of the Higgs boson
• Fully-differential Top-Pair Production at a Lepton Collider: From Threshold to Continuum
• Measuring the top Yukawa coupling at the ILC at sqrt(s) = 500 GeV
• Heavy Pair Production Currents with General Quantum Numbers in Dimensionally Regularized NRQCD
• Probing CP violation in $e^{+}{e}^{-}$ production of the Higgs boson and toponia
• Top physics at high-energy lepton colliders
• Probing the CP properties of top Yukawa coupling at an $e^{+}{e}^{-}$ collider
• The Higgs sector of supersymmetric theories and the implications for high-energy colliders
• Top quark mass measurement in radiative events at electron-positron colliders
• Off resonance background effects in e+e- -> t anti-t H
• Top Threshold Physics