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

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hartl, C. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C. -E. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Béni, Noémi Tekla and Karancsi, János and Molnár, József and Pálinkás, József and Szillási, Zoltán and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2014) 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. JOURNAL OF HIGH ENERGY PHYSICS (6). ISSN 1126-6708

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Abstract

Measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at √ s = 8 TeV. 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 σt-ch. = 83.6 ± 2.3 (stat) ± 7.4 (syst) pb. The single t and t cross sections are measured to be σt-ch.(t) = 53.8 ± 1.5 (stat) ± 4.4 (syst) pb and σt-ch.(t) = 27.6±1.3 (stat)±3.7 (syst) pb, respectively. The measured ratio of cross sections is Rt-ch. = σt-ch.(t)/σt-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 Vtb is extracted and, in combination with a previous CMS result at √ s = 7 TeV, a value |Vtb| = 0.998 ± 0.038 (exp.) ± 0.016 (theo.) is obtained.

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