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Measurement of the inclusive and differential $t$-channel single top quark production cross section at 13 TeV with the CMS experiment

Seith, David

A measurement of the inclusive and differential $t$-channel single top quark production cross section is performed in this thesis.
The measurement uses 137 fb$^{-1}$ of data recorded at the CMS experiment at the LHC with a center-of-mass energy of 13 TeV.
Events are selected with exactly one muon or electron and two or three jets, of which at least one is identified as originating from a bottom quark.
In the analysis an improved technique for reconstructing the top quark has been developed that makes use of a neural network in order to achieve a better description of the top quark's kinematic variables.
A multiclassification BDT is used to classify events into different process categories.

The cross sections are extracted from a fit to the output distribution of the multiclassification BDT.
The inclusive cross section of $t$-channel single top quark production was measured to be $\sigma_{\mathrm{t}} = 130 \pm 20 \, \mathrm{pb}$ and the cross section of top antiquark production to be $\sigma_{\mathrm{\bar{t}}} = 80 \pm 15 \, \mathrm{pb}$.

The differential cross section measurement is performed via unfolding.
The measured differential cross sections as a function of the top quark transverse momentum and rapidity agree with the predictions of the SM.
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DOI: 10.5445/IR/1000128926
Veröffentlicht am 01.03.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Hochschulschrift
Publikationsdatum 01.03.2021
Sprache Englisch
Identifikator KITopen-ID: 1000128926
Verlag Karlsruher Institut für Technologie (KIT)
Umfang xii, 172, xxvi S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Institut für Experimentelle Teilchenphysik (ETP)
Prüfungsdatum 18.12.2020
Referent/Betreuer Prof. T. Müller
Schlagwörter single top, top quark, LHC, CMS, 13 TeV, cros section, polarization, Run 2
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