Carlo Oleari

Matching NLO QCD computations with parton shower simulations: the POWHEG method

The aim of this work is to describe in detail the POWHEG method, first suggested by one of the authors, for interfacing parton-shower generators with NLO QCD computations. We describe the method in its full generality, and then specify its features in two subtraction frameworks for NLO calculations: the Catani-Seymour and the Frixione-Kunszt-Signer approach. Two examples are discussed in detail in both approaches: the production of hadrons in e+e− collisions, and the Drell-Yan vector-boson production in hadronic collisions.

A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX

In this work we illustrate the POWHEG BOX, a general computer code framework for implementing NLO calculations in shower Monte Carlo programs according to the POWHEG method. Aim of this work is to provide an illustration of the needed theoretical ingredients, a view of how the code is organized and a description of what a user should provide in order to use it.

Erratum: NLO single-top production matched with shower in POWHEG: s- and t-channel contributions

We present a next-to-leading order calculation of single-top production interfaced to Shower Monte Carlo programs, implemented according to the POWHEG method. A detailed comparison with MC@NLO and PYTHIA is carried out for several observables, for the Tevatron and LHC colliders.

NLO vector-boson production matched with shower in POWHEG

We present a next-to-leading-order calculation of W/Z production interfaced to shower Monte Carlo, implemented according to the POWHEG method. Finite width effects, Z/γ interference and angular correlations of decay products are included. A detailed comparison with MC@NLO and PYTHIA is carried out.

VBFNLO: A Parton level Monte Carlo for processes with electroweak bosons

VBFNLO is a flexible parton level Monte Carlo program for the simulation of vector boson fusion (VBF), QCD induced single and double vector boson production plus two jets, and double and triple vector boson production (plus jet) in hadronic collisions at next-to-leading order (NLO) in the strong coupling constant, as well as Higgs boson plus two jet production via gluon fusion at the one-loop level. For the new version -- Version 2.7.0 -- several major enhancements have been included into VBFNLO. The following new production processes have been added:

NLO Higgs boson production via gluon fusion matched with shower in POWHEG

W\gamma jj

NLO Higgs boson production via vector-boson fusion matched with shower in POWHEG

in VBF,

Jet pair production in POWHEG

HHjj

Vector boson plus one jet production in POWHEG

in VBF,

A Proposal for a standard interface between Monte Carlo tools and one-loop programs

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