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- Johan Alwall, Alessandro Ballestrero, +17 authors F. Maltoni
- Computer Physics Communications
- 2007

A standard file format is proposed to store process and event information, primarily output from parton-level event generators for further use by general-purpose ones. The information content is identical with what was already defined by the Les Houches Accord five years ago, but then in terms of Fortran commonblocks. This information is embedded in a… (More)

We analyse W boson production at hadron colliders in association with one or two jets, both with the exact kinematics and in the high-energy limit. We argue that the configurations that are kinematically favoured tend to have the W boson forward in rapidity. Thus W boson production in association with jets lends itself naturally to extensions to the… (More)

- J Alwall, R Frederix, +6 authors F Maltoni
- 2008

The strongest constraint on V tb presently comes from the 3 × 3 unitarity of the CKM matrix, which fixes V tb to be very close to one. If the unitarity is relaxed, current information from top production at Tevatron still leaves open the possibility that V tb is sizably smaller than one. In minimal extensions of the standard model with extra heavy quarks,… (More)

- S. Frixione, E. Laenen, +19 authors D. Zeppenfeld
- 2003

Recently the collider physics community has seen significant advances in the formalisms and implementations of event generators. This review is a primer of the methods commonly used for the simulation of high energy physics events at particle colliders. We provide brief descriptions, references, and links to the specific computer codes which implement the… (More)

We introduce a new color decomposition for multi-parton amplitudes in QCD, free of fundamental-representation matrices and structure constants. This decomposition has a physical interpretation in terms of the flow of color, which makes it ideal for merging with shower Monte-Carlo programs. The color-flow decomposition allows for very efficient evaluation of… (More)

We compare different procedures for combining fixed-order tree-level matrix-element generators with parton showers. We use the case of W-production at the Tevatron and the LHC to compare different implementations of the so-called CKKW and MLM schemes using different matrix-element generators and different parton cascades. We find that although similar… (More)

- J Campbell, S Dawson, +7 authors S Willenbrock
- 2004

In the Standard Model, the coupling of the Higgs boson to b quarks is weak, leading to small cross sections for producing a Higgs boson in association with b quarks. However, Higgs bosons with enhanced couplings to b quarks, such as occur in supersymmetric models for large values of tan β, will be copiously produced at both the Tevatron and the LHC in… (More)

We present results for the SM and MSSM Higgs-boson production cross sections at the Tevatron and the LHC. The SM cross sections are a compilation of the state-of-the-art theoretical predictions. The MSSM cross sections are obtained from the SM ones by means of an effective coupling approximation, as implemented in FeynHiggs. Numerical results have been… (More)

- J Campbell, F Maltoni, F Tramontano
- Physical review letters
- 2007

We calculate the cross section for hadroproduction of a pair of heavy quarks in a (3)S(1) color-singlet state at next-to-leading order in QCD. This corresponds to the leading contribution in the nonrelativistic QCD expansion for J/psi and Upsilon production. The higher-order corrections have a large impact on the p(T) distributions, enhancing the production… (More)

- P Artoisenet, J Campbell, J P Lansberg, F Maltoni, F Tramontano
- Physical review letters
- 2008

We update the theoretical predictions for direct Upsilon(nS) hadroproduction in the framework of nonrelativistic QCD. We show that the next-to-leading order corrections in alpha(S) to the color-singlet transition significantly raise the differential cross section at high p(T) and substantially affect the polarization of the Upsilon. Motivated by the… (More)