1. LHCb, R. Aaij et al., arXiv:1705.05802 [hep-ex]
2. BaBar, J.P. Lees et al., Phys. Rev. D 88(7), 072012 (2013). arXiv:1303.0571 [hep-ex]
3. Belle, S. Hirose et al., arXiv:1612.00529 [hep-ex]
4. LHCb, R. Aaij et al., Phys. Rev. Lett. 115(11), 111803 (2015). arXiv:1506.08614 [hep-ex]. [Addendum: Phys. Rev. Lett. 115(15), 159901 (2015)]
5. LHCb, R. Aaij et al., Phys. Rev. Lett. 113, 151601 (2014). arXiv:1406.6482 [hep-ex]