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SUMMARY:Search for lepton flavour universality violation in $B^+ \\rightar
 row K^+ \\ell^+ \\ell^-$ decays at LHCb
DTSTART;VALUE=DATE-TIME:20190326T100000Z
DTEND;VALUE=DATE-TIME:20190326T110000Z
DTSTAMP;VALUE=DATE-TIME:20190320T120254Z
UID:indico-event-779306@indico.cern.ch
DESCRIPTION:Recent measurements of observables involving the flavour chang
 ing neutral current transition $b \\rightarrow s \\mu^+ \\mu^-$ have shown
  an interesting pattern of tensions with respect to the predictions of the
  Standard Model (SM). However\, the interpretation of these results is lim
 ited by our present understanding of the hadronic uncertainties affecting 
 these predictions. Given the lepton-flavour-universal nature of the SM\, o
 bservables such as $R_{K} = {BR(B^+\\rightarrow K^+ \\mu^+ \\mu^-)}/{BR(B^
 +\\rightarrow K^+ e^+ e^-)}$\, so-called Lepton Flavour Universality ratio
 s\, profit from large cancellation of the theory uncertainties and provide
  a very sensitive probe for physics beyond the SM.\n\nThe previous measure
 ment of the ratio $R_K$ performed by the LHCb collaboration\, using Run 1 
 data\, found a value compatible with the SM expectation at the 2.6$\\sigma
 $ level. In this seminar\, a new measurement of $R_K$ at the LHCb experime
 nt will be presented. The new measurement reanalyses the data recorded by 
 LHCb during Run 1\, and adds data collected during 2015 and 2016. The tota
 l dataset is double the size of that previously analysed.\n\nhttps://indic
 o.cern.ch/event/779306/
LOCATION:CERN 222-R-001
URL:https://indico.cern.ch/event/779306/
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