Measurement of the $${\mathrm {t}\overline{\mathrm {t}}}$$ t t ¯ production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at $$\sqrt{s}=13\,\text {Te}\text {V} $$ s = 13 Te
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10052_2019_Article_6863.pdf
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Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Dragicevic, M.
Erö, J.
Del Valle, A. E
Date Issued
April 29, 2019
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2019 Apr 29;79(5):368
Version
Final published version
Abstract
Abstract
A measurement of the top quark–antiquark pair production cross section
$$\sigma _{\mathrm {t}\overline{\mathrm {t}}} $$
σ
t
t
¯
in proton–proton collisions at a centre-of-mass energy of 13
$$\,\text {Te}\text {V}$$
Te
is presented. The data correspond to an integrated luminosity of
$$35.9{\,\text {fb}^{-1}} $$
35.9
fb
-
1
, recorded by the CMS experiment at the CERN LHC in 2016. Dilepton events (
$$\mathrm {e}$$
e
$$^{\pm }$$
±
$$\mathrm {\mu }$$
μ
$$^{{\mp }}$$
∓
,
$$\mathrm {\mu ^+}\mathrm {\mu ^-}$$
μ
+
μ
-
,
$$\mathrm {e}^+\mathrm {e}^-$$
e
+
e
-
) are selected and the cross section is measured from a likelihood fit. For a top quark mass parameter in the simulation of
$$ m_\mathrm {\mathrm {t}} ^{\mathrm {MC}} = 172.5 \,\text {Ge}\text {V} $$
m
t
MC
=
172.5
Ge
the fit yields a measured cross section
$$\sigma _{\mathrm {t}\overline{\mathrm {t}}} = 803 \pm 2 \,\text {(stat)} \pm 25 \,\text {(syst)} \pm 20 \,\text {(lumi)} \,\text {pb} $$
σ
t
t
¯
=
803
±
2
(stat)
±
25
(syst)
±
20
(lumi)
pb
, in agreement with the expectation from the standard model calculation at next-to-next-to-leading order. A simultaneous fit of the cross section and the top quark mass parameter in the powheg simulation is performed. The measured value of
$$m_\mathrm {\mathrm {t}} ^{\mathrm {MC}} = 172.33 \pm 0.14 \,\text {(stat)} \,^{+0.66}_{-0.72} \,\text {(syst)} \,\text {Ge}\text {V} $$
m
t
MC
=
172.33
±
0.14
(stat)
-
0.72
+
0.66
(syst)
Ge
is in good agreement with previous measurements. The resulting cross section is used, together with the theoretical prediction, to determine the top quark mass and to extract a value of the strong coupling constant with different sets of parton distribution functions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/epjc/s10052-019-6863-8
