Top: ATLAS results from rarity to precision

by Josh McFayden (Lawrence Berkeley National Lab. (US))

Tuesday 9 Jun 2020, 11:00 → 12:00 Europe/Zurich

Video only (CERN)

The abundant production of top quark events at the LHC allows testing the standard model in unprecedented ways.  The relative probability for W bosons to decay to a muon or a tau-lepton is measured, selecting events in which a top quark pair decays to two opposite-sign leptons plus jets through W bosons. The measurement confirms the universality of tau and muon couplings to the W boson with the highest precision, to date.  In a second analysis, charged leptons are again used to select di- and multi-lepton final states with high jet multiplicity. The kinematic, multiplicity and flavour properties are input to a multivariate discriminant to recognise and establish evidence for the extremely rare production of four top quarks in an event.

 

 

2020-06-09_LHCSeminar_TopPrecisionRarity_mcfayden_final.pdf

Recording