Observation of a Narrow Mass State Decaying Into Υ(1S) + γ in pp- Collisions at √s = 1.96 TeV
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Using data corresponding to an integrated luminosity of 1:3 fb-1, we observe a narrow mass state decaying into Υ (1S) + γ, where the Υ(1S) meson is detected by its decay into a pair of oppositely charged muons, and the photon is identified through its conversion into an electron-positron pair. The significance of this observation is 5.6 standard deviations. The mass of the state is centered at 10:551 ± 0:014(stat) ± 0:017(syst) GeV/c2, which is consistent with that of the state recently observed by the ATLAS Collaboration.