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dc.contributor.authorBabar Collaboration-
dc.contributor.authorAzzolini, Virginia-
dc.contributor.authorLópez-March, Neus-
dc.contributor.authorMartínez-Vidal, Fernando-
dc.contributor.authorMilanés, Diego A.-
dc.contributor.authorOyanguren, Arantza-
dc.contributor.authorAubert, B.-
dc.identifier.citationPhysical Review Letters 103 (16): 161801 (2009)en_US
dc.description.abstractWe have performed a search for the eta_b(1S) meson in the radiative decay of the Upsilon(2S) resonance using a sample of 91.6 million Upsilon(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 {+4.6} {-4.5} (stat) +/- 1.9 (syst) MeV, corresponding to an eta_b(1S) mass of 9394.2 {+4.8} {-4.9} (stat) +/- 2.0 (syst) MeV/c^2. The branching fraction for the decay Upsilon(2S) --> gamma eta_b(1S) is determined to be [3.9 +/-1.1 (stat) {+1.1} {-0.9} (syst)] x 10^(-4). We find the ratio of branching fractions B[Upsilon(2S) --> gamma eta_b(1S)]/B[Upsilon(3S) --> gamma eta_b(1S)] = 0.82 +/- 0.24 (stat) {+0.20}{-0.19} (syst).en_US
dc.description.sponsorshipWe are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.en_US
dc.format.extent182665 bytes-
dc.publisherAmerican Physical Societyen_US
dc.titleEvidence for the eta(b)(1S) Meson in Radiative Y(2S) Decayen_US
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/ 10.1103/PhysRevLett.103.161801en_US
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