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Measurement of the t-channel single top quark cross section in proton-proton collisions at $ \sqrt{s}=5.02 $ TeV

CMS Collaboration ; Hayrapetyan, A.; Makarenko, V.; Tumasyan, A.; Adam, W.; Benato, L.; Bergauer, T.; Dragicevic, M.; Giordano, C.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Matthewman, M.; Schieck, J.; Schöfbeck, R.; Shooshtari, M.; Sonawane, M.; ... mehr

Abstract:

The single top quark t-channel production cross section is measured in proton-proton collisions at the CERN LHC at √s = 5.02 TeV, using data recorded with the CMS detector in 2017, corresponding to an integrated luminosity of 302 pb−1, and resulting in the first CMS measurement of the process at that energy. Events with one electron or muon and two or more jets, among which at least one is identified as originating from a b quark fragmentation, are analyzed. The combined cross section of single top quark (tq) and single top antiquark (¯tq) production is σ(tq + ¯tq) = 25.5$^{+3.6}_{-3.5}$(stat)$^{+4.2}_{−3.9}$(syst) ± 0.5(lumi) pb. The individual cross sections are measured to be σ(tq) = 17.7$^{+2.9}_{−2.7}$(stat)$^{+2.6}_{-2.4}$(syst) ± 0.3(lumi) pb and σ(¯tq) = 6.7$^{+2.4}_{-1.6}$(stat)$^{+2.1}_{−2.5}$(syst) ± 0.1(lumi) pb. Their ratio is measured to be R$_{t−ch}$ = 2.7$^{+1.5}_{−0.8}$(stat)$^{+1.2}_{−0.3}$(syst). The absolute value of the Cabibbo-Kobayashi-Maskawa matrix element is found to be |fLVVtb| = 0.92 ± 0.09(exp) ± 0.01(theo). The measurements are in good agreement with the standard model predictions at next-to-next-to-leading order accuracy in quantum chromodynamics.


Verlagsausgabe §
DOI: 10.5445/IR/1000197682
Veröffentlicht am 09.10.2026
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Algebra und Geometrie (IAG)
Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2026
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708, 1127-2236
KITopen-ID: 1000197682
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2026
Heft 8
Seiten Art.-Nr.: 223
Vorab online veröffentlicht am 27.08.2026
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