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Single top and $V$$_{tb}$ measurements

S. Mitra, on behalf of the ATLAS and CMS Collaborations

in 9th International Workshop on the CKM Unitarity Triangle

Contribution: pdf


Measurements of single top quark production are presented, based on the LHC data collected at centre-of-mass energies of 7, 8 and 13 TeV. The cross sections for the electroweak production of single top quarks in the t-channel as well as in association with W bosons are measured and the results are used to estimate the CKM matrix element $V_{tb}$. In the t-channel, the ratio of top and anti-top production cross sections is determined and compared with predictions from different parton density distribution functions. Searches dedicated to the s-channel production at the LHC are also discussed. Further, searches for the presence of any anomalous interactions at the tWb vertex beyond the predictions of the standard model are presented. These searches are carried out in the t-channel production mode by performing measurements of top polarization, helicities etc. from its decay products. Limits are obtained to constrain new physics.