NNLO vs parton-showers - THEP Mainz

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Signal cross-section after cuts• K-factors are at the order of 1• depending on scale choice even < 1• ! inclusive K-factors predict an increase by a factors of 2 !• very small scale variation after cuts are applied• Is this a very precise prediction for the cross-section?18
Are these results reliable?• We could hurry and declare “victory” of the fixed-orderperturbation theory for the signal cross-section:• smaller higher order corrections after cuts• smaller scale variation after cuts• But...• is this accidental?• are effects beyond <strong>NNLO</strong> important?• The cuts restrict the phase-space significantly, especially thejet-veto (but not exclusively) restricts the Higgs boson phasespaceto the low transverse momentum region...• ... where fixed-order theory might break down!• ... do we need resummation for an accurate prediction?19
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 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: Maximum transverse momentum• agai
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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