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

Abstract

We present a search for the B-> pi e^+ e^- and B-> pi μ^+ μ^- 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 -> π\ell^+\ell^-) < 6.2x10^-8 at the 90% confidence level.

8 pages, 3 figures, accepted by PRD(RC)

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• Flavor Physics in the Quark Sector
• Flavor probes of axion-like particles
• Are the CKM anomalies induced by vector-like quarks? Limits from flavor changing and Standard Model precision tests
• $B\to \pi \ell \ell$ form factors for new-physics searches from lattice QCD
• New-physics signals of a model with a vector-singlet up-type quark
• First observation of the decay $B^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$
• Rates and Asymmetries of B --> pi l+ l- Decays
• A Search for the Rare Decays B --> pi l+l- and B0 --> eta l+l-
• Predictions for $B_s\to {\bar{K}}^{\ast }\ell \ell$ in non-universal $Z^{\prime }$ models
• Exclusive $B-->\pi {\ell }^{+}{\ell }^{-}$ and $B-->\rho {\ell }^{+}{\ell }^{-}$ Decays in the Universal Extra Dimension
• Search for Rare $b\to d{\ell }^{+}{\ell }^{-}$ Transitions at Belle
• Signatures of a Flavor Changing $Z^{\prime }$ Boson in $B_q\to \gamma Z^{\prime }$
• Investigating New Physics through the Observables of Semileptonic $B_s\to K^{\ast }(\to K\pi ){\mu }^{+}{\mu }^{-}$ Decay
• Theoretical Status of Rare B Decays with Muons
• Radiative Penguin Decays at e^+ e^- Colliders
• Radiative and Leptonic B-meson Decays from the B-factories