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Measurement of the Top Quark mass using data from CDF experiment at Tevatron. Fedor Prokoshin. Part 2. Tevatron :. Top Production at Tevatron. single top:. top-antitop pairs:. 85%. ~2 pb. 15%. ~1 pb. ~ one top event every 10 BILLION inelastic collisions. Hadronization time.

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measurement of the top quark mass using data from cdf experiment at tevatron

Measurement of the Top Quark mass using data from CDF experimentat Tevatron

FedorProkoshin

Part 2

slide2

Tevatron:

Top Production at Tevatron

single top:

top-antitop pairs:

85%

~2 pb

15%

~1 pb

~ one top event every 10 BILLION inelastic collisions

top quark decay

Hadronization time

NO top hadrons

Top quark decay

final state given by W+ W- decays

slide4

Events where neither of the W bosons decay by the lepton channel can be referred to as 'all jets‘ or ‘hadronic’ since all the detector sees is hadron jets.

Events in which both the positively charged W boson and the negatively charged W boson decay by the lepton channel can be known as the 'dilepton' channel.

Events in which only one W boson decays by the lepton channel can be known as the single-lepton(or lepton+jets) channel.

Event Classification

qqqqbb hadronic 44%

Lnlnbb dilepton11 (5)%

lnqqbb lepton+jets44 (30)%

event selection
Event selection
  • 1 energetic (ET>20 GeV) isolated lepton (e,μ)
  • 4 energetic (ET>15 GeV) jets (of which 2 b jets)
  • Large ETmis > 20 GeV
backgrounds
Backgrounds
  • Diboson
  • Single top
  • W+multijet
    • W+LF jets
    • W+HF jets
  • Non-W (QCD)
  • EWK 10 %
  • W+jets 65 %
  • non-W 23 %

TOTAL BACKGROUND 32 %

slide7

B hadrons are long-lived

semileptonic B hadron decay

Vertex displaced tracks

Soft Lepton Tagging

Tagging B-jets

  • Top events contain B hadrons
  • Only 1-2% of dominant W+jets background contains heavy flavor
  • Great S/B improvement

55%

0.5%

Top Event Tagging Efficiency

False Tag Rate (QCD jets)

15%

3.6%

slide8

Lepton+jets

    • Undetected neutrino
      • Px and Py from Et conservation
      • 2 solutions for Pz from MW=Mln
    • Leading 4 jets combinatorics
      • 12 possible jet-parton assignments
      • 6 with 1 b-tag
      • 2 with 2 b-tags
    • ISR + FSR

final state:

CDF sees:

mass templates
Mass templates

M top

140

200

Mi=140

Mi=160

Mi=180

Mi=200

final fit
FINAL FIT

Mtop = 168.9 ± 2.2 (stat) ± 4.2 (syst) GeV/c2

summary of current results
Summary of current results

http://www-cdf.fnal.gov/physics/new/top/public_mass.html

kinematics
KINEMATICS

Equations

Constraints

Observables:

Unknown