# Observation of a narrow mass state decaying into Upsilon(1S) + gamma in ppbar collisions at sqrt(s) = 1.96 TeV

4 D0
IPNL - Institut de Physique Nucléaire de Lyon
Abstract : Using data corresponding to an integrated luminosity of 1.3 fb^-1, we observe a narrow mass state decaying into Upsilon(1S)+gamma, where the Upsilon(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 \pm 0.014 (stat.) \pm 0.017 (syst.) GeV/c^2, which is consistent with that of the state recently observed by the ATLAS Collaboration.
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Journal articles
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http://hal.in2p3.fr/in2p3-00683165
Contributor : Sylvie Flores <>
Submitted on : Wednesday, March 28, 2012 - 7:07:22 AM
Last modification on : Thursday, November 19, 2020 - 12:58:56 PM

### Citation

V.M. Abazov, U. Bassler, G. Bernardi, D. Brown, J. Brown, et al.. Observation of a narrow mass state decaying into Upsilon(1S) + gamma in ppbar collisions at sqrt(s) = 1.96 TeV. Physical Review D, American Physical Society, 2012, 86, pp.031103(R). ⟨10.1103/PhysRevD.86.031103⟩. ⟨in2p3-00683165⟩

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