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

Collaboration, D0 and Bertram, Iain and Borissov, Guennadi and Fox, Harald and Ross, Anthony and Williams, Mark and Ratoff, Peter (2012) Observation of a narrow mass state decaying into Upsilon(1S) + gamma in ppbar collisions at sqrt(s) = 1.96 TeV. Physical Review D, 86 (3). ISSN 1550-7998

[img]
Preview
PDF
PhysRevD.86.031103.pdf - Published Version

Download (4MB)

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.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
© 2012 American Physical Society 6 pages, 4 figures
ID Code:
63433
Deposited By:
Deposited On:
19 Apr 2013 09:58
Refereed?:
Yes
Published?:
Published
Last Modified:
28 May 2020 02:46