Next-to-leading order corrections to Wt production and decay

By John M. Campbell, Francesco Tramontano. 2005

208 citations recorded by the source corpus.

Abstract We present the results of a next-to-leading order calculation of Wt production, including the decays of both the top quark and the W boson. The effects of radiation in the decay of the top quark are also included. The separation of diagrams which appear in the real corrections, into singly- and doubly-resonant contributions, is performed using a b -jet veto which is motivated by the use of the bottom quark distribution function. We find that, for a choice of scale which is suitable for this approach, the QCD corrections are very mild and only change the cross section by up to 10% at the LHC, depending on the severity of the b -jet veto. When further cuts are applied, applicable for a Higgs boson search in the H → W W ⋆ channel, we find that the radiative effects greatly decrease the number of background events expected from this process. In addition, the shapes of relevant distributions can be significantly changed at next-to-leading order.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e2989a9a8c2bde3969b32fff1575246fa9ec702a

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Citations in the corpus

NLO electroweak automation and precise predictions for W + multijet production at the LHC (2014, methodology): “In Sherpa, dipole subtraction terms can be restricted by means of the so-called α-dipole parameter [99–104], while Munich constructs extra phase-space mappings based on the dipole kinematics, and automatically adds them to the generic set of the real-emission based phase-space parametrisations used ”
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations (2014, methodology): “All single-top channels are also available in MCFM [326–329], MC@NLO [173, 330], and POWHEG [331,332].”
Single-top Wt-channel production matched with parton showers using the POWHEG method (2010, methodology): “Moreover, in [ 15 ] for the first time differential results at the NLO were presented and QCD corrections to the top-quark decay have been also included, in the narrow-width approximation.”
NLO single-top production matched with shower in POWHEG: s- and t-channel contributions (2009, background): “ects into the simulation of hadronic processes, it is important to consistently match ﬁxed order results with parton showers. Radiative corrections for single-top production have been known for years [4, 11, 12, 13, 14, 15, 16, 17, 18], while the implementation of these results into a next-to-leadin”
Measurement of the t-channel single-top-quarkproduction cross section and of the |Vtb| CKM matrixelement in pp collisions at √s = 8 TeV (2014, background): “At leading order (LO), three different mechanisms can be distinguished, namely the t-channel, the s-channel and the associated production of a single top quark and a W boson (tW) [1–3].”
HatHor for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions (2014, methodology): “In practice, the extraction is however non-trivial due to the complicated structure of one-loop calculations and the fact that this option is not intended by the authors of MCFM.”
Single-top production in MC@NLO (2005, unknown): “he size of unknown contributions of higher orders. Calculations of fully-diﬀerential NLO single-t cross sections have been performed in refs. [5, 6, 7, 8] and, including NLO top quark decay, in refs. [9, 10, 11, 12, 13]. On the other hand, in order to optimize acceptance cuts in an experimental anal”
Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations (2012, methodology): “This scheme is implemented in Monte Carlo integrators such as MCFM [1–3] for specific processes involving the top quark.”
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