Study of three-body charmless B decays at Belle

Abstract

Using a data sample of 21.3 fb${}^{-1}$ collected by the Belle detector, three body charmless decays $B^{+}\to K^{+}{h}^{+}{h}^{-}$ have been studied. With no assumptions on the intermediate mechanisms, the following branching fractions have been measured for the first time $\mathcal{B}(B^{+}\to K^{+}\ddot{I}{€}^{-}\ddot{I}{€}^{+})=(58.5\pm 7.1\pm 8.8)\times 10^{-6}$ and $\mathcal{B}(B^{+}\to K^{+}{K}^{-}{K}^{+})=(37.0\pm 3.9\pm 4.4)\times 10^{-6}$. We also present the first observations of the decay mode $B^{+}\to K^{\ast 0}(892)\ddot{I}{€}^{+}$ with a branching fraction of $\mathcal{B}(B^{+}\to K^{\ast 0}(892)\ddot{I}{€}^{+})=(16.7_{-3.4-2.1-5.9}^{+3.7+2.1+3.0})\times 10^{-6}$ and the decay mode $B^{+}\to f_0(980)K^{+}$ with a product branching fraction of $\mathcal{B}(B^{+}\to f_0(980)K^{+})\times \mathcal{B}(f_0(980)\to \ddot{I}{€}^{+}\ddot{I}{€}^{-})=(11.7_{-2.7-1.5-1.0}^{+2.5+1.5+4.1})\times 10^{-6}$.

Paper submitted to the 2001 Lepton Photon Conference