Measurement of the top quark pair production cross section in the single-lepton channel with ATLAS in proton-proton collisions at 8 TeV using kinematic fits with b-tagging

Measurement of the top quark pair production cross section in the single-lepton channel with ATLAS in proton-proton collisions at 8 TeV using kinematic fits with b-tagging

ATLAS

Collaboration

Nov 12, 2012

12 pages

Published: 2012

Report number:

ATLAS-CONF-2012-149,
ATLAS-CONF-2012-149

Experiments:

CERN-LHC-ATLAS,
CERN-LHC-ATLAS

View in:

CERN Document Server

pdf

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Abstract: (CDS)

A measurement of the top quark pair (

t\bar{t}

) inclusive production cross section in

pp

collisions at a centre-of-mass energy of

\sqrt{s}=8

TeV is presented. Data were collected with the ATLAS detector at the CERN Large Hadron Collider. The analysis has been done in the lepton+jets final state in a data set corresponding to an integrated luminosity of 5.8 fb

^{-1}

. A multivariate technique and

b

-jet identification were employed to separate the signal

t\bar{t}

events from the various backgrounds. The inclusive

t\bar{t}

production cross section is measured to be

\sigma_{t\bar{t}} = 241 \pm 2

(stat.)

\pm 31

(syst.)

\pm 9

(lumi.) pb and is in good agreement with the theoretical prediction

\sigma_{t\bar{t}}^{theor.} = 238^{+22}_{-24}

pb.

Note:

Preliminary results •
All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2012-149 •
Preliminary results

top: pair production
p p: scattering
pair production
jet: final state
bottom: particle identification
ATLAS
background
experimental results
data analysis method

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