Abstract
Abstract We present results for the QCD next-to-leading order (NLO) calculation of single-top t-channel production in the 4-flavour scheme, interfaced to Parton Shower (PS) Monte Carlo programs according to the POWHEG and MC@NLO methods. Comparisons between the two methods, as well as with the corresponding process in the 5-flavour scheme are presented. For the first time results for typical kinematic distributions of the spectator-b jet are presented in an NLO + PS approach.
Highlights
The theoretical effort to produce accurate predictions for this process is significant, and several improvements with respect to the first result of ref. [6] were achieved in the past: after the QCD next-to-leading order (NLO) predictions obtained in refs. [7,8,9], studies on the impact of resummation [10, 11], off-shell effects [12, 13], and electroweak corrections [14] were performed in recent years
We present results for the QCD next-to-leading order (NLO) calculation of single-top t-channel production in the 4-flavour scheme, interfaced to Parton Shower (PS) Monte Carlo programs according to the POWHEG and MC@NLO methods
One can conclude that the 4-flavour and the 5-flavour approaches are both reliable and in mutual agreement when theoretical uncertainties are taken into account, as expected, the predictions obtained in the 4-flavour scheme are more precise, containing NLO corrections, and more solid than the 5-flavour ones
Summary
The theoretical effort to produce accurate predictions for this process is significant, and several improvements with respect to the first result of ref. [6] were achieved in the past: after the QCD NLO predictions obtained in refs. [7,8,9], studies on the impact of resummation [10, 11], off-shell effects [12, 13], and electroweak corrections [14] were performed in recent years. An obvious but nontrivial direction to pursue is that of including QCD NLO corrections into Parton Shower (PS) Monte Carlo event generators This has been achieved with the MC@NLO and the POWHEG methods [26, 27], so that nowadays it is possible to simulate with NLO + PS accuracy several processes relevant for lepton and hadron colliders, as well as deep-inelastic scattering. The kinematics of b-flavoured objects plays an important role in the discrimination between s- and t-channel processes It is desirable, especially for the precision that the LHC will achieve, to have tools as accurate as possible in describing these features. The aim of this paper is to present results for the first implementation of this process in the MC@NLO and POWHEG frameworks
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