B-decay Anomalies in a Composite Leptoquark Model
  The collection of a few anomalies in semileptonic $B$-decays, especially in $b\rightarrow c \tau \bar{\nu}$, invites to speculate about the emergence of some striking new phenomena, perhaps interpretable in terms of a weakly broken $U(2)^n$ flavor symmetry and of leptoquark mediators. Here we aim at a partial UV completion of this interpretation by generalizing the minimal composite Higgs model to include a composite vector leptoquark as well. 
Riccardo Barbieri, Christopher W. Murphy, Fabrizio Senia
hep-ph hep-ex