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http://hdl.handle.net/2445/140239
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DC Field | Value | Language |
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dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | BABAR Collaboration | - |
dc.date.accessioned | 2019-09-17T10:43:19Z | - |
dc.date.available | 2019-09-17T10:43:19Z | - |
dc.date.issued | 2007-03-13 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/2445/140239 | - |
dc.description.abstract | We search for the decays B 0 → ρ 0 ρ 0 , B 0 → ρ 0 f 0 ( 980 ) , and B 0 → f 0 ( 980 ) f 0 ( 980 ) in a sample of about 384 × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays collected with the BABAR detector at the PEP-II asymmetric-energy e + e − collider at Stanford Linear Accelerator Center. We find evidence for B 0 → ρ 0 ρ 0 with 3.5 σ significance and measure the branching fraction B = ( 1.07 ± 0.33 ± 0.19 ) × 10 − 6 and longitudinal polarization fraction f L = 0.87 ± 0.13 ± 0.04 , where the first uncertainty is statistical, and the second is systematic. The uncertainty on the Cabibbo-Kobayashi-Maskawa quark-mixing matrix unitarity angle α due to penguin contributions in B → ρ ρ decays is 18° at the 1 σ level. We also set upper limits on the B 0 → ρ 0 f 0 ( 980 ) and B 0 → f 0 ( 980 ) f 0 ( 980 ) decay rates. | - |
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.98.111801 | - |
dc.relation.ispartof | Physical Review Letters, 2007, vol. 98, num. 11, p. 111801 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevLett.98.111801 | - |
dc.rights | (c) American Physical Society, 2007 | - |
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 B0→ρ0ρ0 Decays and Implications for the Cabibbo-Kobayashi-Maskawa Angle α | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 551691 | - |
dc.date.updated | 2019-09-17T10:43:19Z | - |
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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551691.pdf | 218.29 kB | Adobe PDF | View/Open |
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