Abstract
In this work we calculate and provide precise predictions for the signature that is typically exploited at the LHC for the measurement of t-channel single-top production: 1 lepton, 1 light jet, 1 b-jet, ɆT and no additional jets or leptons. We apply the cuts that define the fiducial region and we take into account all the contributions to this signature; not only those from resonant t-channel single-top production. On the one hand, we calculate the complete-NLO corrections, i.e., all NLO effects of QCD and EW origin. On the other hand, we study in detail the impact of a QCD parton shower for the fiducial region we consider. We provide predictions in different approximations at the inclusive level and for several differential distributions. Our study demonstrates the relevance of both EW corrections and shower effects for obtaining precise and reliable theoretical predictions for the single-top-production fiducial region.
Highlights
The total cross section for t-channel single-top production was first measured at the Tevatron about 10 years ago [19, 20], albeit with large uncertainties
We study in detail the impact of a QCD parton shower for the fiducial region we consider
And 6 we plot the predictions at NLO QCD+EW accuracy for Single-Top and W +jets for the same distributions considered in figures 2 and 3, respectively, and we show in the inset of each plot their ratio (Single-Top)/(W +jets), including scale uncertainties
Summary
The total cross section for t-channel single-top production was first measured at the Tevatron about 10 years ago [19, 20], albeit with large uncertainties. In order to be able to tag the t-channel single-top production process experimentally, only leptonic decays of W bosons are considered. Monte Carlo simulations, in which the NLO single-top production processes have been matched to a parton shower are available in the MC@NLO [45, 49,50,51,52], Sherpa [53] and POWHEG [51, 54, 55] frameworks Within the latter framework, the consistent inclusion of the single-top plus one-jet NLO matrix elements has been considered through the (extended) MINLO method [56]. The categorisation of the three main single-top production channels is well-defined at lowest order in perturbation theory, it breaks down when including higher-order quantum corrections. We study in detail the impact of the parton shower on the predictions for the t-channel fiducial region
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