$B^{\pm}_{c}$ meson observation at ATLAS

We observed $B^{\pm}_{c}$ mesons with the ATLAS detector at the LHC through the hadronic decay of $B^{\pm}_{c}\rightarrow J/\psi(\mu^{+}\mu^{-}) \pi^{\pm}$, with 4.3 $fb^{-1}$ 2011 data from 7 TeV pp collisions. The resulting $B^{\pm}_{c}$ mass distribution is fitted with an unbinned maximum likelihood fit. The mass value is consistent with the world average value.