title: Next-to-leading-order predictions for t-channel single-top production at hadron colliders.
abstract: We present the predictions at next-to-leading order (NLO) in the strong coupling for the single-top cross section in the t channel at the Tevatron and the LHC. Our calculation starts from the 2-->3 Born amplitude gq-->tb[over ]q;{'}, keeping the b-quark mass nonzero. A comparison is performed with a traditional NLO calculation of this channel based on the 2-->2 Born process with a bottom quark in the initial state. In particular, the effect of using kinematic approximations and resumming logarithms of the form log(Q2/m(b)2) in the 2-->2 process is assessed. Our results show that the 2-->3 calculation is very well behaved and in substantial agreement with the predictions based on the 2-->2 process.
authors.affiliation: Department of Physics, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
authors.forename: J M
authors.initials: JM
authors.lastname: Campbell
authors.forename: R
authors.initials: R
authors.lastname: Frederix
authors.forename: F
authors.initials: F
authors.lastname: Maltoni
authors.forename: F
authors.initials: F
authors.lastname: Tramontano