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

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.

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Publication Details

Journal
KITopen
Published
2026-10-09
DOI
https://doi.org/10.5445/ir/1000197682
Primary Topic
Particle physics theoretical and experimental studies
Type
article
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article

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

M. Vanden Bemden, C. -E Wulz, S. Van Putte, A. Giammanco et al.
KITopen
Particle physics theoretical and experimental studies
article

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

M. Vanden Bemden, C. -E Wulz, S. Van Putte, A. Giammanco, P. Vanlaer, T. Bergauer, M. De Coen, F. Heyen, A. K. Das, H. Kwon, H. Evard, G. A. Alves, M. Dragicevic, D. Liko, M. Delcourt, D. Matos Figueiredo, T. Janssen, P. Kashko, W. L. Aldá Júnior, J. D’Hondt, E. Coelho, S. Dansana, C. Vander Velde, S. Turkcapar, D. Ocampo Henao, A. Vilela Pereira, M. Tytgat, T. Menezes De Oliveira, P. Malek, L. Benato, T. Van Laer, G. Gokbulut, S. Bein, CMS Collaboration, A. Bethani, I. De Bruyn, D. Marckx, V. Lemaitre, L. Thomas, J. van der Linden, M. Jeitler, A. De Moor, K. Skovpen, N. Breugelmans, J. Lidrych, R. Schöfbeck, A. M. Tomaru, Y. Hong, W. Waltenberger, F. Gameiro Casalinho, F. A. Khan, A. Hayrapetyan, D. Müller, M. Sonawane, F. Zhang, B. Clerbaux, G. De Lentdecker, L. Wezenbeek, M. Shooshtari, J. Bierkens, H. Brandao Malbouisson, A. Malara, J. Vandenbroeck, L. Favart, V. Makarenko, C. Giordano, P. Gianneios, G. P. Van Onsem, N. Van Den Bossche, C. Mora Herrera, W. Adam, M. Matthewman, M. Barroso Ferreira Filho, A. Sharma, P. S. Hussain, B. Bilin, M. A. Shahzad, H. Aarup Petersen, E. J. Tonelli Manganote, J. Schieck, A. Benecke, P. Mastrapasqua, C. Hensel, D. Dobur, S. Lowette, P. Rebello Teles, I. Makarenko, D. Vannerom, S. Tavernier, A. Tumasyan, A. J. Li, P. Van Mechelen, J. De Favereau De Jeneret, A. Khalilzadeh, G. Bruno, A. Cappati, A. O. Guzel, N. Krammer, C. Delaere, M. Soeiro
article en

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.

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Particle physics theoretical and experimental studies
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