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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)

- Alessandro Ballestrero, Aissa Belhouari, Giuseppe Bevilacqua, Vladimir Kashkan, Ezio Maina
- Computer Physics Communications
- 2009

PHANTOM is a tree level Monte Carlo for six parton final states at proton–proton, proton–antiproton and electron–positron collider at O(α 6 EM) and O(α 4 EM α 2 S) including possible interferences between the two sets of diagrams. This comprehends all purely electroweak contributions as well as all contributions with one virtual or two external gluons. It… (More)

- DFTT, Alessandro Ballestrero, Ezio Maina, Stefano Moretti
- 2008

Heavy quark production in multijet events at e + e − colliders is studied at tree level. Total production rates are given and compared with the corresponding results for massless quarks. A new method of computing helicity amplitudes is briefly sketched.

Boson-boson scattering and Higgs production in boson-boson fusion hold the key to electroweak symmetry breaking. In order to analyze these essential features of the Standard Model we have performed a partonic level study of all processes q 1 q 2 → q 3 q 4 q 5 q 6 lν at the LHC using the exact matrix elements at O(α 6 em) provided by PHASE, a new MC… (More)

- E Accomando, A Ballestrero, E Maina
- 2004

PHASE is a Monte Carlo event generator, under construction, for all Standard Model processes with six fermions in the final state at the LHC. It employs the full set of tree level Feynman diagrams, taking into account fermion masses for b quarks. The program can generate unweighted events for any subset of all six fermion final states in a single run, by… (More)

One-loop weak corrections to the b ¯ b cross section at TeV energy hadron colliders Abstract We investigate one-loop weak corrections to the production cross section of two b-jets at Teva-tron and Large Hadron Collider (LHC). We establish that they are small at inclusive level but dominant in exclusive observables that have a non-trivial dependence on the… (More)

- A Ballestrero, D G Charlton, +25 authors B R Webber
- 1997

The W Mass and QCD Working Group discussed a wide variety of topics relating to present and future measurements of M W at LEP 2, including QCD backgrounds to W + W − production. Particular attention was focused on experimental issues concerning the direct reconstruction and threshold mass measurements, and on theoretical and experimental issues concerning… (More)

PHANTOM is a tree level Monte Carlo for six parton final states at proton–proton, proton–antiproton and electron–positron collider at O(α 6 EM) and O(α 4 EM α 2 S) including possible interferences between the two sets of diagrams. This comprehends all purely electroweak contribution as well as all contributions with one virtual or two external gluons. It… (More)

- Alessandro Ballestrero, Giuseppe Bevilacqua, Diogo Buarque Franzosi, Ezio Maina
- 2009

A complete parton level analysis of ℓ + ℓ − + four jets (ℓ = e, µ) and 3ℓν + two jets production at the LHC is presented, including all processes at order O(α 6 EM), O(α 4 EM α 2 S) and O(α 2 EM α 4 S) when appropriate. The infinite Higgs mass scenario, which is considered as a benchmark for strong scattering theories and is the limiting case for composite… (More)

- E. Maina
- 2002

We report on the calculation of the factorisable one-loop weak-interaction corrections to the initial and final states for three-jet observables in electron-positron annihilations. We show that whereas such corrections are negligibly small at LEP energies they are significantly enhanced at a future Linear Collider, where we argue that they may be similar in… (More)