TWiki> LHCPhysics Web>CrossSections>LHCHWGBb (revision 5)EditAttachPDF

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

Group Contacts and Members

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

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
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 Sort
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

Meetings

-- ReiTanaka - 02-Oct-2010

Edit | Attach | Watch | Print version | History: r11 | r7 < r6 < r5 < r4 | Backlinks | Raw View | Raw edit | More topic actions...
Topic revision: r5 - 2011-05-30 - ChristopherPotter
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    LHCPhysics All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback