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SUMMARY:Measurement of CKM matrix element |Vcb| in ttbar events with the A
 TLAS detector
DTSTART:20260701T123000Z
DTEND:20260701T133000Z
DTSTAMP:20260722T193800Z
UID:indico-event-15074@indico.global
DESCRIPTION:Speakers: Bowen Zhang (University of Warwick)\n\nThe top quark
  is a unique probe for physics in the Standard Model and beyond. This talk
  highlights recent ATLAS results on free parameter measurements using top 
 quark events. In particular\, we focus on the first measurement of the CKM
  matrix element |Vcb| using on-shell W-boson decays in ttbar events. This 
 analysis offers an independent test of the long-standing tension in tradit
 ional low-energy extractions via inclusive and exclusive semileptonic deca
 ys of B hadrons. Using 140 fb-1 of pp collision data at 13 TeV collected b
 y the ATLAS experiment during Run 2\, a value of |Vcb| = (50 +11/-14) x 10
 ^-3 is obtained\, with roughly equal statistical and systematic uncertaint
 ies. While the sensitivity does not yet rival traditional determinations m
 ade at much lower energy scales\, this novel approach probes a completely 
 different physical situation\, namely the rare hadronic t -> b bbar c deca
 y at high momentum-transfer. Together\, these analyses demonstrate innovat
 ive ways to leverage vast LHC datasets to push the precision frontier and 
 explore rare processes.\n\nhttps://indico.global/event/15074/
LOCATION:Small Lecture Theatre (Poynting)
URL:https://indico.global/event/15074/
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