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SUMMARY:Search for lepton flavour universality violation in B+→K+ℓ+ℓ
 − decays at LHCb - Paula Alvarez Cartelle (Imperial College)
DTSTART:20190507T150000Z
DTEND:20190507T160000Z
UID:TALK122266@talks.cam.ac.uk
CONTACT:William Fawcett
DESCRIPTION:Recent measurements of observables involving the flavour chang
 ing neutral current transition b→sμ+μ− have shown an interesting pat
 tern of tensions with respect to the predictions of the Standard Model (SM
 ). However\, the interpretation of these results is limited by our present
  understanding of the hadronic uncertainties affecting these predictions. 
 Given the lepton-flavour-universal nature of the SM\, observables such as 
 RK=BR(B+→K+μ+μ−)/BR(B+→K+e+e−)\, so-called Lepton Flavour Univer
 sality ratios\, profit from large cancellation of the theory uncertainties
  and provide a very sensitive probe for physics beyond the SM. The previou
 s measurement of the ratio RK performed by the LHCb collaboration\, using 
 Run 1 data\, found a value compatible with the SM expectation at the 2.6σ
  level. In this seminar\, a new measurement of RK at the LHCb experiment w
 ill be presented. The new measurement reanalyses the data recorded by LHCb
  during Run 1\, and adds data collected during 2015 and 2016. The total da
 taset is double the size of that previously analysed.
LOCATION:Ryle Seminar Room (Rutherford 930) 
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