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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(α6 EM) and O(α4 EMα 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 can… (More)

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

A complete parton level analysis of ll + four jets (l = e, μ) and 3lν + two jets production at the LHC is presented, including all processes at order O(α6 EM ), O(α4 EM α S ) and O(α2 EM α 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 Higgs… (More)

WPHACT 2.0 is the new fully massive version of a MC program and unweighted event generator which computes all Standard Model processes with four fermions in the final state at ee colliders. The program can now generate unweighted events for any subset of all four fermion final states in a single run, by making use of dedicated pre-samples which can cover… (More)

The complete matrix element for ee → bb̄WW has been computed at tree–level and applied to ZH production followed by Z → bb̄ and H → WW, keeping into account all irreducible backgrounds, which are dominated by tt̄ production, at the Next Linear Colliders. We find that, depending on the center of mass energies and on the search strategies, this channel can be… (More)

- E. Maina
- 2006

Boson boson scattering and Higgs production in boson boson fusion will be actively investigated at the LHC. We have performed a parton level study of all processes of the type q1q2 → q3q4q5q6ll using for the first time a full fledged six fermion Monte Carlo event generator which employs exact matrix elements at O(αem). We have examined Higgs production in… (More)

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 q1q2 → q3q4q5q6lν at the LHC using the exact matrix elements at O(α 6 em) provided by PHASE, a new MC generator. These… (More)

- DFTT, Alessandro Ballestrero, Ezio Maina, Stefano Moretti
- 1993

The production of photon pairs in ee → f f̄γγ processes is studied using exact helicity amplitudes at tree level. Total cross sections, including initial state radiation effects, are given. They are presented in the case of quarks as a function of ycut in the JADE algorithm. In the case of leptons we use cuts similar to the ones employed in a recent L3… (More)

- DFTT, Ezio Maina, Roberto Pittau, Marco Pizzio
- 1997

One-loop QCD corrections to the full gauge invariant set of electroweak diagrams describing the charged current processes ee → u d̄ μ ν̄μ (CC10), ee → u d̄ e ν̄e (CC20) and ee → u d̄ s c̄ (CC11) are computed. We compare the exact calculation with a “naive”approach to strong radiative corrections which has been widely used in the literature and discuss the… (More)

PHANTOM is a tree level Monte Carlo for six parton final states at proton–proton, proton–antiproton and electron–positron collider at O(α6 EM) and O(α4 EMα 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 can… (More)