Measurement of the t-channel single top-quark cross section at 13 TeV

by Dr Maryam Zeinali (IPM)

Wednesday 16 Sept 2015, 15:00 → 16:15 Asia/Tehran

Seminar Room (Larak)

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 42pb⁻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 σ_t−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.)±0.02(theo.). The results are found to be in agreement with predictions by the standard model.

Results are documented in http://cds.cern.ch/record/2052187