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SUMMARY:Lepton Flavour Universality - measuring BR(W-&gt\;τν)/BR(W-&gt\;
 μν) at the LHC - Christopher Young (Albert Ludwigs Universität Freiburg
 )
DTSTART:20210601T150000Z
DTEND:20210601T160000Z
UID:TALK157636@talks.cam.ac.uk
CONTACT:William Fawcett
DESCRIPTION:In the Standard Model on of the fundamental principles is that
  the couplings of the W-boson to the different lepton flavours (e\, mu\, t
 au) should be identical. Therefore\, outside of small phase space effects\
 , the branching ratio of W->lν should be identical for all flavours of le
 pton. The most precise previous measurements of the branching ratios of th
 e W boson to the different lepton flavours were from the Large Electron-Po
 sitron Collider (LEP) at CERN and showed some tension with the Standard Mo
 del. This seminar will describe an ATLAS analysis at the LHC measuring the
  ratio BR(W->τν)/BR(W->μν) with higher precision than the previous LEP
  measurements to test this tension with the Standard Model expectation. To
 p--anti-Top events are used to provide a large sample of W-bosons with whi
 ch to perform the measurement. One top is then used to trigger and tag the
  events and the other is used to test the ratio in question.
LOCATION:https://cern.zoom.us/j/61144924828?pwd=WDB6QmFCMEZiSEN5Q0k2aklWSj
 k5Zz09
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