Abstract
We give an overview of the status of theoretical predictions for single-top production in the Standard Model. We focus in particular on recent developments, including calculations of off-shell effects at next-to-leading order beyond the narrow-width approximation, all-order resummation of soft corrections and matching of next-to-leading order parton-level results to Monte Carlo parton showers.
Highlights
The hadroproduction of a single top quark, first observed at the Tevatron [1, 2], is a process of significant phenomenological relevance, providing informations complementary to those that can be obtained from top-quark pair production
The study of the production of a single top quark will be an important part of the physics programme of the Large Hadron Collider (LHC) at Cern, where several results are already available [3, 4, 5, 6]
In view of its phenomenological relevance, in the last few years a lot of effort has been put into providing an accurate theoretical description of single-top production at hadron colliders
Summary
The hadroproduction of a single top quark, first observed at the Tevatron [1, 2], is a process of significant phenomenological relevance, providing informations complementary to those that can be obtained from top-quark pair production. Off-shell and non-factorizable corrections to single-to production In the framework of the NWA NLO contributions are given by factorizable corrections to the on-shell production and decay of the top quark, while non-factorizable contributions connecting initial- and final-state light partons, as well as off-shell and finite-width effects, are neglected These terms are small for the total cross section, of order of the top width-to-mass ratio Γt/mt ∼ 1%, due to large cancellations between virtual and real corrections. The calculation of [28, 29] is based on an effective-field theory (EFT) description of the singletop production process [30], built upon the hierarchy Γt mt In this approach contributions to the amplitude are divided into hard corrections, encoding physics at the large momentum scale q ∼ mt, and soft contributions, describing the long-distance physics associated with the low scale q ∼ Γt. In the effective theory only soft modes are described by dynamical fields, while hard contributions are encoded into the effective couplings (matching coefficients) of the dσ/dminv [pb/GeV] dσ/dMT [pb/GeV]
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