Updated Results from LHCb

Описание: This is an update to a previous video, "New Physics in LHCb data?"
   • New Flavor Physics in LHCb data?  
where we look at new measurements of R_K and R_K* recently released by LHCb.


Previous measurements of these quantities appeared to mildly disagree with the Standard Model and hinted at the possibility of lepton flavor violation. Their new results are in agreement with the Standard Model prediction. Here, we look at the new and old results and see what changed.


The old LHCb papers:


Test of lepton universality with B0→K∗0ℓ+ℓ−B^{0} \rightarrow K^{*0}\ell^{+}\ell^{-}B0→K∗0ℓ+ℓ− decays. LHCb Collaboration, R. Aaij, et al. Published in: JHEP 08 (2017) 055. e-Print: 1705.05802 [hep-ex]



Test of lepton universality in beauty-quark decays. LHCb Collaboration, R. Aaij, et al. Published in: Nature Phys. 18 (2022) 3, 277-282. e-Print: 2103.11769 [hep-ex].


The new LHCb papers:
Test of lepton universality in b→sℓ+ℓ−b \rightarrow s \ell^+ \ell^-b→sℓ+ℓ− decays. LHCb Collaboration, e-Print: 2212.09152 [hep-ex].


Measurement of lepton universality parameters in B+→K+ℓ+ℓ−B^+\to K^+\ell^+\ell^-B+→K+ℓ+ℓ− and B0→K∗0ℓ+ℓ−B^0\to K^{*0}\ell^+\ell^-B0→K∗0ℓ+ℓ− decays. LHCb Collaboration, e-Print: 2212.09153 [hep-ex].