Observation of a narrow mass state decaying into Υ(1S)+γ in pp̄ collisions at s=1.96 TeV
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Abstract
Using data corresponding to an integrated luminosity of 1.3fb -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. © 2012 American Physical Society.
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Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 86, n. 3, 2012.
