Zooming in on $$B\rightarrow K^*\ell \ell $$B→K∗ℓℓ decays at low recoil

  title={Zooming in on \$\$B\rightarrow K^*\ell \ell \$\$B→K∗ℓℓ decays at low recoil},
  author={Simon Brass and Gudrun Hiller and Ivan Nǐsand{\vz}i{\'c}},
  journal={The European Physical Journal C},
We analyse $$B\rightarrow K^*\ell \ell $$B→K∗ℓℓ decays in the region of low hadronic recoil, where an operator product expansion (OPE) in $$1/m_b$$1/mb applies. Using a local model for charm contributions based on $$e^+ e^- \rightarrow \mathrm{hadrons}$$e+e-→hadrons against the OPE provides a data-driven method to access the limitations to the OPE’s accuracy related to binnings in the dilepton mass. Model-independent fits to $$B\rightarrow K^*\mu \mu $$B→K∗μμ low recoil angular observables… 
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