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We analyse subleading electroweak effects in the top anti-top resonanceproduction region in e+ e- collisions which arise due to the decay of the topand anti-top quarks into the W+ W- b bbar final state. These are NLOcorrections adopting the non-relativistic power counting v ~ alpha_s ~sqrt(alpha_EW). In contrast to the QCD corrections which have been calculated(almost) up to NNNLO, the parametrically larger NLO electroweak contributionshave not been completely known so far, but are mandatory for the requiredaccuracy at a future linear collider. The missing parts of these NLOcontributions arise from matching coefficients of non-resonant production-decayoperators in unstable-particle effective theory which correspond to off-shelltop production and decay and other non-resonant irreducible backgroundprocesses to t tbar production. We consider the total cross section of the e+e- -> W+ W- b bbar process and additionally implement cuts on the invariantmasses of the W+ b and W- bbar pairs.

Electroweak non-resonant NLO corrections to e+ e- -> W+ W- b bbar in the t tbar resonance region