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H->bbbar Final State Subgroup (LHC HXS WG)

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Group Contacts and Contributors

All contributors are welcome!

Meeting Agendae

Plan of Activity

  • VH->Vbb differential K-factor (LO to NLO) in signal and background after common cuts with MC@NLO and POWHEG
  • ttH->ttbb differential K-factor (LO to NLO) in signal with aMC@NLO
  • evaluation of VH->Vbb and ttH->ttbb cross section uncertainties at NLO after common cuts

Common cuts definition between CMS/ATLAS/LHCb

VH->Vbb for LHCb

Boosted VH->Vbb (PRELIMINARY!)

  • pt(H)>200 GeV
  • pt(V)>200 GeV
  • No additional C/A jets with pt > 20 GeV (|eta|<2.4)

Non-boosted VH->Vbb (PRELIMINARY proposal from ATLAS, to be discussed with CMS and LHCb)

  • pT(e/mu) > 20-25GeV
  • |eta(e/mu)| < 2.5
  • 2 jets with pT>25GeV
  • MET > 25GeV (????)

ttH->ttbb (PRELIMINARY!)

  • exactly one isolated lepton with pt>25 GeV (20 GeV) e(mu).
  • >=6 jets with pt>20 GeV
  • >=4 b-tagged jets with pt>20 GeV

Baseline Common Parameters

Preliminary parameters are taken from arXiv:1101.0538 (PDF, alpha_s, delta alphs_s) and Table A.1 in CERN-2011-002.

Parameter arXiv:1101.0538 Choice Sort
alpha_s 0.118, 0.1207, 0.119 resp.
delta alpha_s 0.002 90% C.L.

ParameterSorted ascending CERN-2011-002 Choice Sort
b pole mass 1-loop 4.49 GeV
b pole mass 2-loop 4.69 GeV
b quark mass 4.75 GeV
c pole mass 1-loop 1.41 GeV
c pole mass 2-loop 1.55 GeV
c quark mass 1.40 GeV
d quark mass 190 MeV
electron mass 0.510998910(13) MeV
GF 1.16637(1) 10−5 GeV−2
MS scheme b mass 4.16 GeV
MS scheme c mass 1.28 GeV
muon mass 105.658367(4) MeV
NLO W width 2.08872 GeV
NLO Z width 2.49595 GeV
s quark mass 190 MeV
t quark mass 172.5 2.5 GeV
tau mass 1776.84(17) MeV
u quark mass 190 MeV
W mass 80.398 0.025 GeV
W width 2.141 0.041 GeV
Z mass 91.1876 0.0021 GeV
Z width 2.4952 0.0023 GeV

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-- ReiTanaka - 02-Oct-2010

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Topic revision: r6 - 2011-06-02 - ChristopherPotter
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