Observation of $B^+ \to \chi_{c0} K^+ $

Abstract

We report the first observation of the decay $B^+ \to \chi_{c0} K^+$ using 21.3 fb$^{-1}$ of data collected by the Belle detector at the $\Upsilon$(4S) resonance. The preliminary result for the branching fraction is ${\cal{B}}(B^+\to \chi_{c0}K^+)=(8.0^{+2.7}_{-2.4}\pm 1.0\pm 1.1)\times 10^{-4}$ where the first error is statistical, the second is systematic, and the third comes from the uncertainty in the $\chi_{c0}\to\pi^+\pi^-$ branching fraction.