Measurement of the inclusive and fiducial t(t)over-bar production cross-sections in the lepton plus jets channel in pp collisions at root s=8 TeV with the ATLAS detector
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Date
2018-06-12Source Title
European Physical Journal C: Particles and FieldsPublisher
SPRINGERAffiliation
School of PhysicsMetadata
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Journal ArticleCitations
Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abidi, S. H., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adye, T., Affolder, A. A. ,... Zwalinski, L. (2018). Measurement of the inclusive and fiducial t(t)over-bar production cross-sections in the lepton plus jets channel in pp collisions at root s=8 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 78 (6), https://doi.org/10.1140/epjc/s10052-018-5904-z.Access Status
Open AccessAbstract
The inclusive and fiducial
t
t
¯
production cross-sections are measured in the lepton+jets channel using
20.2
fb
-
1
of proton-proton collision data at a centre-of-mass energy of 8 TeV recorded with the ATLAS detector at the LHC. Major systematic uncertainties due to the modelling of the jet energy scale and b-tagging efficiency are constrained by separating selected events into three disjoint regions. In order to reduce systematic uncertainties in the most important background, the
W
+\,jets
process is modelled using
Z
+ jets events in a data-driven approach. The inclusive
t
t
¯
cross-section is measured with a precision of 5.7% to be
σ
inc
(
t
t
¯
)
=
248.3
±
0.7
(
stat
.
)
±
13.4
(
syst
.
)
±
4.7
(
lumi
.
)
pb
, assuming a top-quark mass of 172.5 GeV. The result is in agreement with the Standard Model prediction. The cross-section is also measured in a phase space close to that of the selected data. The fiducial cross-section is
σ
fid
(
t
t
¯
)
=
48.8
±
0.1
(
stat
.
)
±
2.0
(
syst
.
)
±
0.9
(
lumi
.
)
pb
with a precision of 4.5%.
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