** LFU ratio R with actual data **


** Tasks **

Extract R(m_ll) from these searches:
  * ATLAS 13 TeV bump search with 139/fb: https://arxiv.org/abs/1903.06248 (https://www.hepdata.net/record/ins1725190) (36/fb here: https://arxiv.org/abs/1707.02424 - https://www.hepdata.net/record/79077)
  * ATLAS 8 TeV SM Drell-Yan measurement: https://arxiv.org/abs/1606.01736 (http://hepdata.cedar.ac.uk/h8test/view/ins1467454)
  * CMS 8 TeV SM Drell-Yan measurement: https://arxiv.org/abs/1412.1115 (http://hepdata.cedar.ac.uk/view/ins1332509)

** Preliminary Results **

  * R with ATLAS Drell-Yan analysis 8TeV 20.3/fb: [[https://www.dropbox.com/s/qfh22icw2andu0t/R_ATLAS8TeV.pdf|Plot]]
  * R with ATLAS Drell-Yan analysis 13 TeV 36/fb: [[https://www.dropbox.com/s/be23d9n6esc3wr9/ATLAS_13tev.pdf|Plot]]
  * Examples of R with some benchmark EFT coefficients: [[https://www.dropbox.com/s/mdhjr5gyomvvxfj/R_examples.pdf|Plot]]

  * On uncertainties, looking at the ratio of PDFs between 13 and 8 TeV: http://www.hep.ph.ic.ac.uk/~wstirlin/plots/plots.html we expect signal statistics to increase by at least a factor of 2 per fb-1 below 1TeV and up to a factor of 3 at 1.5TeV. For 8TeV ATLAS measurement stat and syst uncertanties are compatible up to ~300-380GeV. Increasing the data to full Run 2 would make stat and syst compatible up to around 500GeV using the current binning. We would expect another factor of 2 of stat uncertainties decrease for full Run 3 with ATLAS/CMS combination. 


**Official Participants: add your email**
  * marco.nardecchia@roma1.infn.it
  * david.marzocca@ts.infn.it
  * dario.buttazzo@pi.infn.it
  * juhidutta@hri.res.in 
  * thrynova@mail.cern.ch (contact person)
  * minho.son@kaist.ac.kr