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

Overview

abstract

  • ; A; bstract; ; ; The single top quark; t; -channel production cross section is measured in proton-proton collisions at the CERN LHC at; ; ; $$ sqrt{s}=5.02 $$; ; ; 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 (; ; ; $$ overline{mathrm{t}}mathrm{q} $$; ; ; t; ¯; ; q; ; ; ; ) production is; ; ; $$ sigma left(mathrm{tq}+overline{mathrm{t}}mathrm{q}right)={25.5}_{-3.5}^{+3.6}{left(mathrm{stat}right)}_{-3.9}^{+4.2}left(mathrm{syst}right)pm 0.5left(mathrm{lumi}right) $$; ; σ; ; ; tq; +; ; t; ¯; ; q; ; ; =; ; 25.5; ; −; 3.5; ; ; +; 3.6; ; ; ; ; stat; ; ; −; 3.9; ; ; +; 4.2; ; ; ; syst; ; ±; 0.5; ; lumi; ; ; ; ; pb. The individual cross sections are measured to be; ; ; $$ sigma left(mathrm{tq}right)={17.7}_{-2.7}^{+2.9}{left(mathrm{stat}right)}_{-2.4}^{+2.6}left(mathrm{syst}right)pm 0.3left(mathrm{lumi}right) $$; ; σ; ; tq; ; =; ; 17.7; ; −; 2.7; ; ; +; 2.9; ; ; ; ; stat; ; ; −; 2.4; ; ; +; 2.6; ; ; ; syst; ; ±; 0.3; ; lumi; ; ; ; ; pb and; ; ; $$ sigma left(overline{mathrm{t}}mathrm{q}right)={6.7}_{-1.6}^{+2.4}{left(mathrm{stat}right)}_{-2.5}^{+2.1}left(mathrm{syst}right)pm 0.1left(mathrm{lumi}right) $$; ; σ; ; ; ; t; ¯; ; q; ; ; =; ; 6.7; ; −; 1.6; ; ; +; 2.4; ; ; ; ; stat; ; ; −; 2.5; ; ; +; 2.1; ; ; ; syst; ; ±; 0.1; ; lumi; ; ; ; ; pb. Their ratio is measured to be; ; ; $$ {mathcal{R}}_{mathrm{t}-mathrm{ch}}={2.7}_{-0.8}^{+1.5}{left(mathrm{stat}right)}_{-0.3}^{+1.2}left(mathrm{syst}right) $$; ; ; R; ; t; −; ch; ; ; =; ; 2.7; ; −; 0.8; ; ; +; 1.5; ; ; ; ; stat; ; ; −; 0.3; ; ; +; 1.2; ; ; ; syst; ; ; ; ; . The absolute value of the Cabibbo-Kobayashi-Maskawa matrix element is found to be -; f; LV; V; tb; - = 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.;

publication date

  • August 27, 2026

Date in CU Experts

  • September 2, 2026 5:03 AM

Full Author List

  • Hayrapetyan A; Makarenko V; Tumasyan A; Adam W; Benato L; Bergauer T; Dragicevic M; Giordano C; Hussain PS; Jeitler M

author count

  • 2408

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1029-8479

Additional Document Info

volume

  • 2026

issue

  • 8

number

  • 223