Phenomenological studies of top-pair production at NLO
Phenomenological studies of top-pair production at NLO Phenomenological studies of top-pair production at NLO
Structure of NLO Calculations σ NLO = = m m dσ B + dσ B + m+1 m+1 dσ R − m+1 dσ A + dσ R − dσ D + m m+1 dσ A + m dσ V dσ V + dσ I + dσ KP HELAC-DIPOLES - complete, public and automatic Catani-Seymour dipoles Extended for arbitrary polarizations Monte Carlo over polarization states of external particles Monte Carlo over color Phase space restriction on the dipoles phase space Less dipole subtraction terms per event Increased numerical stability Reduced missed binning problem Czakon, Papadopoulos, Worek '09 8
One-loop amplitude and rational part Reduction of tensor integrals OPP coefficients and rational part HELAC-1LOOP CUTTOOLS pp → t¯tjj HELAC-NLO HELAC- DIPOLES ONELOOP Catani-Seymour dipole subtraction for massless and massive cases Scalar integrals 9
- Page 1 and 2: Phenomenological studies of top-pai
- Page 3 and 4: HELAC-NLO Group G. Bevilacqua (RWTH
- Page 5 and 6: Motivation for NLO Stabilizing the
- Page 7: Structure of NLO Calculations σ N
- Page 11 and 12: Top Pair Production Complete off-s
- Page 13 and 14: Top Pair Production TeVatron Diffe
- Page 15 and 16: TeVatron Top Pair Production A t FB
- Page 17 and 18: Top Pair + 2 Jets Partonic subproc
- Page 19 and 20: TeVatron Top Pair + 2 Jets Correct
- Page 21 and 22: Top Pair + 2 Jets A t FB,LO = −0.
- Page 23 and 24: LHC Top Pair + 2 Jets m tt 20% 30%
- Page 25: Summary & Outlook Already calculat
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 />
HELAC-DIPOLES - complete, public and autom<strong>at</strong>ic C<strong>at</strong>ani-Seymour dipoles<br />
Extended for arbitrary polariz<strong>at</strong>ions<br />
Monte Carlo over polariz<strong>at</strong>ion st<strong>at</strong>es <strong>of</strong> external particles<br />
Monte Carlo over color<br />
Phase space restriction on the dipoles phase space<br />
Less dipole subtraction terms per event<br />
Increased numerical stability<br />
Reduced missed binning problem<br />
Czakon, Papadopoulos, Worek '09<br />
8
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