BABAR Collaboration (Including:

). (2009) Evidence for the eta(b)(1S) meson in radiative Y(2S) decay. Physical Review Letters, Vol.103 (No.16). article no. 161801 . ISSN 0031-9007

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Abstract

We have performed a search for the eta(b)(1S) meson in the radiative decay of the Y(2S) resonance using a sample of 91.6 x 10(6) Y(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at E-gamma = 609.3(-4.5)(+4.6)(stat) +/- 1.9(syst) MeV, corresponding to an eta(b)(1S) mass of 9394.2(-4.9)(+4.8)(stat) +/- 2.0(syst) MeV/c(2). The branching fraction for the decay Y(2S) --> gamma eta(b)(1S) is determined to be 3.9 +/- 1.1(stat)(-0.9)(+1.1)(syst)] x 10(-4). We find the ratio of branching fractions B[Y(2S) --> gamma eta(b)(1S)]/B[Y(3S) --> gamma eta(b)(1S)] = 0.82 +/- 0.24(stat)(-0.19)(+0.20)(syst).

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Date:	16 October 2009
Volume:	Vol.103
Number:	No.16
Number of Pages:	7
Page Range:	article no. 161801
Identification Number:	10.1103/PhysRevLett.103.161801
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	DOE, NSF (USA), NSERC (Canada), CEA, CNRS-IN2P3 (France), BMBF, DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), STFC (United Kingdom), Marie Curie EIF (European Union), A. P. Sloan Foundation.
URI:	http://wrap.warwick.ac.uk/id/eprint/17111

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