Evidence for B- → τ- ν(τ) with a hadronic tagging method using the full data sample of Belle

Phys Rev Lett. 2013 Mar 29;110(13):131801. doi: 10.1103/PhysRevLett.110.131801. Epub 2013 Mar 25.


We measure the branching fraction of B- → τ- ν(τ) using the full Υ(4S) data sample containing 772×10(6) BB pairs collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. Events with BB pairs are tagged by reconstructing one of the B mesons decaying into hadronic final states, and B- → τ- ν(τ) candidates are detected in the recoil. We find evidence for B- → τ- ν(τ) with a significance of 3.0 standard deviations including systematic errors and measure a branching fraction B(B- → τ- ν(τ))=[0.72(-0.25)(+0.27)(stat)±0.11(syst)]×10(-4).

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Elementary Particles*
  • Nuclear Physics / methods*
  • Quantum Theory*