Lepton angular asymmetries in semileptonic charmful B decays
  We study the lepton angular distributions in $B\to D^{(*)} \ell \nu_{\ell}$ decays. The lepton angular asymmetries in the decays with the general effective interactions are examined. We demonstrate that the asymmetries are sensitive to new physics with a right-handed quark current. 
Chuan-Hung Chen, Chao-Qiang Geng