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http://hdl.handle.net/2445/138338
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DC Field | Value | Language |
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dc.contributor.author | Garra Ticó, Jordi | - |
dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | BABAR Collaboration | - |
dc.date.accessioned | 2019-07-25T13:27:50Z | - |
dc.date.available | 2019-07-25T13:27:50Z | - |
dc.date.issued | 2009-10-15 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/2445/138338 | - |
dc.description.abstract | We have performed a search for the η b ( 1 S ) meson in the radiative decay of the Υ ( 2 S ) resonance using a sample of 91.6 × 10 6 Υ ( 2 S ) 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 γ = 609.3 + 4.6 − 4.5 ( stat ) ± 1.9 ( syst ) MeV , corresponding to an η b ( 1 S ) mass of 9394.2 + 4.8 − 4.9 ( stat ) ± 2.0 ( syst ) MeV / c 2 . The branching fraction for the decay Υ ( 2 S ) → γ η b ( 1 S ) is determined to be [ 3.9 ± 1.1 ( stat ) + 1.1 − 0.9 ( syst ) ] × 10 − 4 . We find the ratio of branching fractions B [ Υ ( 2 S ) → γ η b ( 1 S ) ] / B [ Υ ( 3 S ) → γ η b ( 1 S ) ] = 0.82 ± 0.24 ( stat ) + 0.20 − 0.19 ( syst ) . | - |
dc.format.extent | 7 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.103.161801 | - |
dc.relation.ispartof | Physical Review Letters, 2009, vol. 103, num. 16, p. 161801 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevLett.103.161801 | - |
dc.rights | (c) American Physical Society, 2009 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.title | Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 577736 | - |
dc.date.updated | 2019-07-25T13:27:50Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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577736.pdf | 174.57 kB | Adobe PDF | View/Open |
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