Phenomenological studies of top-pair production at NLO
Phenomenological studies of top-pair production at NLO
Phenomenological studies of top-pair production at NLO
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Structure <strong>of</strong> <strong>NLO</strong><br />
Calcul<strong>at</strong>ions<br />
<br />
σ <strong>NLO</strong> =<br />
<br />
=<br />
m<br />
m<br />
<br />
dσ B +<br />
<br />
dσ B +<br />
m+1<br />
m+1<br />
<br />
dσ R −<br />
m+1<br />
<br />
dσ A +<br />
<br />
dσ R − dσ D <br />
+<br />
m<br />
m+1<br />
<br />
dσ A +<br />
m<br />
dσ V<br />
<br />
dσ V + dσ I + dσ KP<br />
Three main building blocks are needed<br />
Evalu<strong>at</strong>ion <strong>of</strong> one-loop amplitude - HELAC-1LOOP<br />
Determin<strong>at</strong>ion <strong>of</strong> coefficients via reduction method<br />
Reduction <strong>at</strong> integrand level - OPP method - CUTTOOLS<br />
Evalu<strong>at</strong>ion <strong>of</strong> scalar functions - ONELOOP<br />
Ossola, Papadopoulos, Pittau ‘07, ’08<br />
Draggiotis, Garzelli, Papadopoulos, Pittau ’09<br />
Garzelli, Malamos, Pittau ’09<br />
van Hameren, Papadopoulos, Pittau ’09<br />
van Hameren, ’10<br />
7
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