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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

Abstract:

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
Schlagwörter single top, top quark, LHC, CMS, 13 TeV, cros section, polarization, Run 2
Referent/Betreuer Müller, T.
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