Measurement of the branching fraction for $B^{\pm }\to {\chi }_{c0\mathrm{}}{K}^{\pm }$

We present a measurement of the branching fraction of the decay $B^{\pm }\to {\chi }_{c0\mathrm{}}{K}^{\pm }$ from a sample of $89\times {10}^6$ $B\overline{B}$ pairs collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. The ${\chi }_{c0\mathrm{}}$ meson is reconstructed through its two-body decays to ${\pi }^{+}{\pi }^{-}$ and $K^{+}{K}^{-}.$ We measure $\mathcal{B}{(B}^{\pm }\overrightarrow{}{\chi }_{c0\mathrm{}}{K}^{\pm })\times \mathcal{B}({\chi }_{c0\mathrm{}}\overrightarrow{}{\pi }^{+}{\pi }^{-})=[{1.32}_{-0.27}^{+0.28\mathrm{}}\left(\mathrm{stat}\right)\pm 0.26\left(\mathrm{syst}\right)]\times {10}^{-6}$ and $\mathcal{B}{(B}^{\pm }\overrightarrow{}{\chi }_{c0\mathrm{}}{K}^{\pm })\times \mathcal{B}({\chi }_{c0\mathrm{}}\overrightarrow{}{K}^{+}{K}^{-})=[{1.49}_{-0.34}^{+0.36\mathrm{}}\left(\mathrm{stat}\right)\pm 0.22\left(\mathrm{syst}\right)]\times {10}^{-6}.$ Using the known values for the ${\chi }_{c0\mathrm{}}$ decays branching fractions, we combine these results to obtain $\mathcal{B}{(B}^{\pm }\to {\chi }_{c0\mathrm{}}{K}^{\pm })=(2.7\mathrm{}\pm 0.7)\times {10}^{-4}.$