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Phenomenological studies of top-pair production at NLO

Phenomenological studies of top-pair production at NLO

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Motiv<strong>at</strong>ion for <strong>NLO</strong><br />

Stabilizing the scale in the QCD input parameters:<br />

Strong coupling constant and PDFs<br />

More reliable theoretical error rel<strong>at</strong>ed to the scale dependence<br />

Normaliz<strong>at</strong>ion and shape <strong>of</strong> distributions first known <strong>at</strong> <strong>NLO</strong><br />

Many scale processes: V+ jets, ttH, tt + jets, bb + jets, njets ...<br />

How do we know which scale to choose ?<br />

Improved description <strong>of</strong> jets<br />

Jets: LO <strong>NLO</strong> Parton Hadron<br />

Shower<br />

Level<br />

5

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