Speaker
Description
The $t$-channel single-top quark production is observed for the first time at a centre-of-mass energy of 5.02 TeV using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. The observation is made using an event selection optimized for the $l$+jets decay topology of the single-top process, which requires candidate events to have exactly one charged lepton (electron or muon), exactly two jets, only one of which must arise from a $b$-hadron decay, and a large transverse momentum imbalance; and after which using a multivariate discriminant to separate the $t$-channel signal events from background events that satisfy the $l$+jets topology. Using a profile likelihood fit, we measured the production cross-section of single-top quarks and antiquarks individually, the inclusive cross-section for the combined production, the ratio of single-top quark to antiquark production, and $V_{tb}$ in the CKM matrix.
| Keyword-1 | Single top t-channel |
|---|---|
| Keyword-2 | Cross-section measurement |
