See Sharepoint discussions here: VH->Vbb, ttH->ttbb, bb.

Group Contacts and Members

• ATLAC/CMS/LHCb Contacts: Chris Potter (Oregon)/Jim Olsen (Princeton)/Clara Matteuzzi (Milano-Bicocca)
• Experiment: Chris Potter, Jim Olsen, Clara Matteuzzi, Chris Neu, Chris Collins-Tooth, Giacinto Piaquadio, Douglas Wright, Michiel Sanders
• Theory: Laura Reina, Michael Spira

Plan of the Activity (both Higgs signals and SM backgrounds)

• differential K-factor
• overview of background determination methods (data-driven, non-data driven)
• list of LO/NLO Monte Carlo's
• wish List for theorists
  • NLO signal generator for ttH->ttbb

Common cuts definition between ATLAS and CMS

VH->Vbb (PRELIMINARY!)

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

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

arXiv:1101.0538

CERN-2011-002

Parameter	arXiv:1101.0538 Choice
NLO PDF	CTEQ6.6, MSTW2008, NNPDF2.0
alpha_s	0.118, 0.1207, 0.119 resp.
delta alpha_s	0.002 90% C.L.

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

Available Tools

Results

References

• ATLAS Sensitivity to the Standard Model Higgs in the HW and HZ Channels at High Transverse Momenta ATL-PHYS-PUB-2009-088
• Search for ttH->ttbb CERN-OPEN-2008-020 (pp. 1333-1363)
• Search for H->bb in Association with a ttbar Pair at CMS CMS-NOTE-2006-119
• PDF4LHC Working Group Interim Recommendations arXiv:1101.0538
• Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables CERN-2011-002

Meetings

• CERN InDico Agenda

-- ReiTanaka - 02-Oct-2010