Abstract:
A measurement of the t-channel single top-quark cross section is performed using the very first LHC proton-proton collisions at 13 TeV with the CMS detector. The dataset corresponds to an integrated luminosity of 42 pb−1. Events are selected with one muon in the final state. The signal is extracted from a fit to the pseudo-rapidity distribution of the recoiling jet. The inclusive cross section is measured to be σt−ch= 274 ± 98 (stat.) ± 52 (syst.) ± 33 (lumi.). The observed (expected) significance of the signal contribution is 3.5 (2.7) standard deviations with respect to the background-only hypothesis. The magnitude of the CKM matrix element Vtb is also calculated, yielding |Vtb|= 1.12 ±0.24(exp.)\pm$ 0.02 (theo.). The results are found to be in agreement with predictions by the standard model.
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