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Phenomenological studies of top-pair production at NLO

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Introduction<br />

8-10 partons in the final st<strong>at</strong>e @ LO, well separ<strong>at</strong>ed to avoid divergences<br />

Standard Model and beyond tools @ tree level (just few examples)<br />

ALPGEN, AMEGIC++/SHERPA, CARLOMAT, COMIX/SHERPA,<br />

COMPHEP, HELAC-PHEGAS, MADGRAPH/MADEVENT,<br />

O'MEGA/WHIZARD, ...<br />

General purpose Monte Carlo programs (parton shower, hadroniz<strong>at</strong>ion,<br />

multiple interactions, hadrons decays, etc.)<br />

HERWIG, HERWIG++, PYTHIA 6.4, PYTHIA 8.1, SHERPA, ...<br />

High sensitivity to unphysical input scales<br />

Higher order calcul<strong>at</strong>ions are needed to improve accuracy <strong>of</strong> prediction<br />

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