NNLO vs parton-showers - THEP Mainz

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Example(Hepp; Denner, Roth; Binoth, Heinrich)• Factorize:=+=+12
H WW at <strong>NNLO</strong>(CA, Dissertori, Stoeckli)• used the fully differential <strong>NNLO</strong> program FEHiP for pp+X• CA, Melnikov, Petriello• added decay matrix-element for the process HWlνlν• large phase-space rejection required reworking the numericalintegration strategy• independent, parallelized VEGAS integration for individual sectors• large improvement of integration adaptation (from no-adaptation toadaptation within a few VEGAS iterations)• easy exploitation of cluster computing• all numbers/plots in our paper required about one week ofrunning time on average 450 CPU’s13
Page 2 and 3: MotivationGluon fusion has been a t
Page 4 and 5: Inclusive Higgs cross-section• Hi
Page 8 and 9: “Scary” cut efficiencies• Cut
Page 11: Sector decomposition for diff. cros
Page 15 and 16: Jet Veto• jet-veto has no impact
Page 17 and 18: Maximum transverse momentum• agai
Page 19 and 20: Are these results reliable?• We c
Page 21 and 22: What can we learn?• It is not obv
Page 23 and 24: • ... and at NNLO:• both spectr
Page 25 and 26: Cut variables: NNLO vs MC@NLO• je
Page 27 and 28: The di-photon channel(stuied by Dis
Page 29 and 30: Two-loop gg h amplitude in the MSS

NNLO vs parton-showers - THEP Mainz

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