CERN Accelerating science

Article
Report number	arXiv:0903.0005
Title	Next-to-Leading-Order Predictions for t-Channel Single-Top Production at Hadron Colliders
Other title	t-channel single-top production at hadron colliders
Author(s)	Campbell, John M (Glasgow U.) ; Frederix, Rikkert (CERN ; Louvain U., CP3) ; Maltoni, Fabio (Louvain U., CP3) ; Tramontano, Francesco (Naples U. ; INFN, Naples)
Publication	2009
Imprint	03 Mar 2009
Note	Comments: 5 pages, 5 figures
In:	Phys. Rev. Lett. 102 (2009) 182003
DOI	10.1103/PhysRevLett.102.182003
Subject category	Accelerators and Storage Rings ; hep-ph
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 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.

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