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 />
C<strong>at</strong>ani-Seymour subtraction scheme<br />
At <strong>NLO</strong>: dσ R with m+1 partons and dσ V with m partons in the final<br />
Separ<strong>at</strong>ely divergent although their sum is finite<br />
dσ A is a proper approxim<strong>at</strong>ion <strong>of</strong> dσ R<br />
i. same singular behavior point-by-point<br />
ii. integrable over extra parton degrees <strong>of</strong> freedom<br />
Individual contributions finite. MC integr<strong>at</strong>ion can be performed !
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