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 -> tbq('), 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(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.
Campbell, J.M., Frederix, R., Maltoni, F., Tramontano, F. (2009). Next-to-leading-order predictions for t-channel single-top production at hadron colliders. PHYSICAL REVIEW LETTERS, 102(18), 182003-182003 [10.1103/PhysRevLett.102.182003].
Next-to-leading-order predictions for t-channel single-top production at hadron colliders
Maltoni, F;
2009
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 -> tbq('), 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(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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.