Search for $B \to \pi \ell^+\ell^-$ Decays at Belle

Understand

We present a search for the B-> pi e^+ e^- and B-> pi \mu^+ \mu^- decays, with a data sample of 657 million BBbar pairs collected with the Belle detector at the KEKB $e^+e^-$ collider.

• Signal events are reconstructed from a charged or a neutral pion candidate and a pair of oppositely charged electrons or muons.
• No significant signal is observed and we set the upper limit on the isospin-averaged branching fraction BF(B -> \pi \ell^+\ell^-) < 6.2x10^-8 at the 90% confidence level.