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 g q -> t bbar q', keeping the b-quark mass non-zero. 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(Q^2/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.
@article{arxiv.0903.0005,
title = {Next-to-leading-order predictions for t-channel single-top production at hadron colliders},
author = {John M. Campbell and Rikkert Frederix and Fabio Maltoni and Francesco Tramontano},
journal= {arXiv preprint arXiv:0903.0005},
year = {2009}
}
Comments
5 pages, 5 figures. Updated results with more recent CTEQ6.6 PDF set. Included PDF uncertainties