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Phenomenological studies of top-pair production at NLO

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Top Pair Production<br />

Complete <strong>of</strong>f-shell effects @ <strong>NLO</strong><br />

Double-, single- and non-resonant<br />

<strong>top</strong> contributions <strong>of</strong> the order O( s3 4 )<br />

Complex-mass scheme for unstable <strong>top</strong><br />

W gauge bosons are tre<strong>at</strong>ed <strong>of</strong>f-shell<br />

pp(p¯p) → e + ν e µ − ν µ b¯b + X<br />

Sum over helicities and color via MC<br />

LO + V obtained by reweighting <strong>of</strong> tree<br />

level unweighted events<br />

Dipole channels for subtracted real part<br />

Check <strong>of</strong> Ward identity for virtual part<br />

Cancell<strong>at</strong>ion <strong>of</strong> divergences<br />

max independence test for real part<br />

Bevilacqua, Czakon, van Hameren, Papadopoulos, Worek ’11<br />

11

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