Measurement of the cross section of top quark-antiquark pair production in association with a W boson in proton-proton collisions at √s = 13 TeV
Abstract The production of a top quark-antiquark pair in association with a W boson ( t t ¯...
| Hauptverfasser: | , , , , , , , , , , , , , , , , , |
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| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Springer Berlin Heidelberg
2023
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| Online Zugang: | https://hdl.handle.net/1721.1/152182 |
| Zusammenfassung: | Abstract
The production of a top quark-antiquark pair in association with a W boson (
t
t
¯
W
$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$
) is measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The analyzed data was recorded by the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 138 fb−1. Events with two or three leptons (electrons and muons) and additional jets are selected. In events with two leptons, a multiclass neural network is used to distinguish between the signal and background processes. Events with three leptons are categorized based on the number of jets and of jets originating from b quark hadronization, and the lepton charges. The inclusive
t
t
¯
W
$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$
production cross section in the full phase space is measured to be 868 ± 40(stat) ± 51(syst) fb. The
t
t
¯
W
$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$
+ and
t
t
¯
W
$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$
− cross sections are also measured as 553 ± 30(stat) ± 30(syst) and 343 ± 26(stat) ± 25(syst) fb, respectively, and the corresponding ratio of the two cross sections is found to be
1.61
±
0.15
stat
−
0.05
+
0.07
syst
$$ 1.61\pm 0.15{\left(\textrm{stat}\right)}_{-0.05}^{+0.07}\left(\textrm{syst}\right) $$
. The measured cross sections are larger than but consistent with the standard model predictions within two standard deviations, and represent the most precise measurement of these cross sections to date. |
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