NNLO vs parton-showers - THEP Mainz

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Inclusive Higgs cross-section• Higgs cross-section in the gluon-fusion channel receives largepertubative corrections:• σ(NLO) ~ 1.7 x σ(LO) (Dawson; Spira, Djouadi, Zerwas)• σ(<strong>NNLO</strong>) ~ 2.0 x σ(LO) (Harlander, Kilgore; CA, Melnikov;Ravindran, Smith, van Neerven)4
Higgs discovery in the WW channel• many channels are exploitedto discover the Higgs at theLHC• in the mass region ~2 m W theHW channel is mostpromising (BR(HW)~1)• but... in the leptonic W decaymodes there are neutrinos inthe final state• no invariant mass peak can be reconstructed• A peak can be found in a signal-rich phase-space regiondefined in terms of many variables.5
Page 2 and 3: MotivationGluon fusion has been a t
Page 8 and 9: “Scary” cut efficiencies• Cut
Page 11 and 12: Sector decomposition for diff. cros
Page 13 and 14: H WW at NNLO(CA, Dissertori, Stoeck
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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