@article{aaij2015measurement,
  title={Measurement of the Ratio of Branching Fractions B (B{\={}} 0→ D*+ $\tau$- $\nu${\={}} $\tau$)/B (B{\={}} 0→ D*+ $\mu$- $\nu${\={}} $\mu$)},
  author={Aaij, Roel and Adeva, B and Adinolfi, M and Affolder, A and Ajaltouni, Z and Akar, S and Albrecht, J and Alessio, F and Alexander, M and Ali, S and others},
  journal={Physical review letters},
  volume={115},
  number={11},
  pages={111803},
  year={2015},
  publisher={APS}
}