# Evidence for s-channel single top quark production at D0

- Institution: CERN
- Department: EP Seminar
- Speaker: Aran Garcia-Bellido
- Year: 2013
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3016850)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

We present the measurements of the cross sections for the two main production modes of single top quarks at the Tevatron with 9.7/fb of data collected by the D0 detector. The analysis employs three different multivariate techniques which are combined to extract the small signal from the large backgrounds in the W+jets final state. We measure independently the t-channel (tqb) and the s-channel (tb), and obtain a lower limit on the CKM matrix element |Vtb|>0.92 at 95% CL. The results are compared with physics beyond the SM. The presence of the s-channel production is established in the D0 data with a significance of more than 3 standard deviations for the first time..

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## Lectures

1. [Evidence for s-channel single top quark production at D0](https://invisiblenetwork.ai/learn/cern/3016850/2d10b2d85b5d), 1 h 4 min (CERN's player)