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A search for excited states of the $B^{\pm}_c$ meson is performed using 4.9fb$^{-1}$ of 7 TeV and 19.2 fb$^{-1}$ of 8 TeV $pp$ collision data collected bythe ATLAS experiment at the LHC. A new state is observed through its hadronictransition to the ground state, with the latter detected in the decay$B_c^{\pm} \to J/\psi \pi^{\pm}$. The state appears in the$m(B_c^{\pm}\pi^{+}\pi^{-})-m(B_c^{\pm})-2m(\pi^{\pm})$ mass differencedistribution with a significance of 5.2 standard deviations. The mass of theobserved state is $6842 \pm 4 \pm 5$ MeV, where the first error is statisticaland the second is systematic. The mass and decay of this state are consistentwith expectations for the second $S\mbox{-}$wave state of the $B^{\pm}_c$meson, $B^{\pm}_c(2S)$.

Observation of an Excited $B^{\pm}_c$ Meson State with the ATLAS Detector