Measurement of the t-channel single-top-quark production cross section and of the |Vtb| CKM matrix element in pp collisions at √s = 8 TeV

Authors

V. Khachatryan, Yerevan Physics Institute
Ekaterina Avdeeva, University of Nebraska-LincolnFollow
Kenneth A. Bloom, University of Nebraska-LincolnFollow
S. Bose, University of Nebraska-LincolnFollow
Daniel R. Claes, University of Nebraska-LincolnFollow
Aaron Dominguez, University of Nebraska-LincolnFollow
Rebeca Gonzalez Suarez, University of Nebraska-LincolnFollow
J. Keller, University of Nebraska-Lincoln
D. Knowlton, University of Nebraska-LincolnFollow
Ilya Kravchenko, University of Nebraska-LincolnFollow
J. Lazo-Flores, University of Nebraska-LincolnFollow
S. Malik, University of Nebraska-LincolnFollow
F. Meier, University of Nebraska-LincolnFollow
Gregory R. Snow, University of Nebraska-LincolnFollow
CMS collaboration

Date of this Version

6-16-2014

Citation

JHEP06(2014)090; doi:10.1007/JHEP06(2014)090

Comments

Copyright © 2014 CERN, issued under CC license; published by Springer.

Abstract

Measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at √s = 8TeV. The results are based on a data sample corresponding to an integrated luminosity of 19.7 fb⁻¹ recorded with the CMS detector at the LHC. The cross section is measured inclusively, as well as separately for top (t) and antitop (t¯), in final states with a muon or an electron. The measured inclusive t - channel cross section is σ_t-ch. = 83.6 ± 2.3 (stat.) ± 7.4 (syst.) pb. The single t and t ¯ cross sections are measured to be σ_t-ch.(t) = 53.8 ± 1.5 (stat.) ± 4.4 (syst.) pb and σ_t-ch.(t¯) = 27.6 ± 1.3 (stat.) ± 3.7 (syst.) pb, respectively. The measured ratio of cross sections is R_t-ch. = σ_t-ch.(t)/σ_t-ch.(t¯) = 1.95±0.10 (stat.)±0.19 (syst.), in agreement with the standard model prediction. The modulus of the Cabibbo-Kobayashi-Maskawa matrix element V_tbis extracted and, in combination with a previous CMS result at √s = 7TeV, a value |V_tb| = 0.998 ± 0.038 (exp.) ± 0.016 (theo.) is obtained.