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

V. Khachatryan , S. Baffioni (1) , F. Beaudette (1) , P. Busson (1) , C. Charlot (1) , T. Dahms (1) , M. Dalchenko (1) , L. Dobrzynski (1) , N. Filipovic (1) , A. Florent (1) , R. Granier de Cassagnac (1) , L. Mastrolorenzo (1) , P. Mine (1) , C. Mironov (1) , I.N. Naranjo (1) , M. Nguyen (1) , C. Ochando (1) , P. Paganini (1) , R. Salerno (1) , J.B. Sauvan (1) , Y. Sirois (1) , C. Veelken (1) , Y. Yilmaz (1) , A. Zabi (1) , J.-L. Agram (2) , J. Andrea (2) , A. Aubin (2) , D. Bloch (2) , J.-M. Brom (2) , E.C. Chabert (2) , C. Collard (2) , E. Conte (2) , J.-C. Fontaine (2) , D. Gele (2) , U. Goerlach (2) , C. Goetzmann (2) , A.-C. Le Bihan (2) , P. van Hove (2) , S. Gadrat (3) , S. Beauceron (4) , N. Beaupere (4) , G. Boudoul (4) , S. Brochet (4) , C.A. Carrillo Montoya (4) , J. Chasserat (4) , R. Chierici (4) , D. Contardo (4) , P. Depasse (4) , H. El Mamouni (4) , J. Fan (4) , J. Fay (4) , S. Gascon (4) , M. Gouzevitch (4) , B. Ille (4) , T. Kurca (4) , M. Lethuillier (4) , L. Mirabito (4) , S. Perries (4) , J.D. Ruiz Alvarez (4) , D. Sabes (1, 4) , L. Sgandurra (4) , V. Sordini (4) , M. Vander Donckt (4) , P. Verdier (4) , S. Viret (4) , H. Xiao (4)

1 LLR - Laboratoire Leprince-Ringuet
2 IPHC - Institut Pluridisciplinaire Hubert Curien
3 CC-IN2P3 - Centre de Calcul de l'IN2P3
4 IPNL - Institut de Physique Nucléaire de Lyon

Measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at sqrt(s) = 8 TeV. The results are based on a data sample corresponding to an integrated luminosity of 19.7 inverse femtobarns recorded with the CMS detector at the LHC. The cross section is measured inclusively, as well as separately for top (t) and antitop (t-bar), in final states with a muon or an electron. The measured inclusive t-channel cross section is sigma[t-ch] = 83.6 +/- 2.3 (stat.) +/- 7.4 (syst.) pb. The single t and t-bar cross sections are measured to be sigma[t-ch,t] = 53.8 +/- 1.5 (stat.) +/- 4.4 (syst.) pb and sigma[t-ch,t-bar] = 27.6 +/- 1.3 (stat.)+/- 3.7 (syst.) pb, respectively. The measured ratio of cross sections is R[t-ch]=sigma[t-ch,t]/sigma[t-ch,t-bar]=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 sqrt(s) = 7 TeV, a value abs(Vtb) = 0.998 +/- 0.038 (exp.) +/- 0.016 (theo.) is obtained.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

V. Khachatryan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Measurement of the t-channel single-top-quark production cross section and of the |Vtb| CKM matrix element in pp collisions at sqrt(s) = 8 TeV. Journal of High Energy Physics, 2014, 6, pp.90. ⟨10.1007/JHEP06(2014)090⟩. ⟨in2p3-00967832⟩