As an addendum to our previous evaluation of the weak-interaction corrections to hadronic top-quark pair production [W. Bernreuther, M. F\"ucker, and Z. G. Si, Phys. Rev. D 74, 113005 (2006).], we determine the leading weak-interaction contributions due to the subprocesses bb̄→tt̄ and gq(q̄)→tt̄q(q̄). For several distributions in tt̄ production at the CERN LHC, we find that these contributions are non-negligible as compared to the weak corrections from the other partonic subprocesses.
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