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http://hdl.handle.net/2445/131790
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DC Field | Value | Language |
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dc.contributor.author | Abellan Beteta, Carlos | - |
dc.contributor.author | Calvo Gómez, Míriam | - |
dc.contributor.author | Camboni, Alessandro | - |
dc.contributor.author | Comerma Montells, Albert | - |
dc.contributor.author | Domingo Bonal, Francesc | - |
dc.contributor.author | Garrido Beltrán, Lluís | - |
dc.contributor.author | Graciani Díaz, Ricardo | - |
dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | López Asamar, Elias | - |
dc.contributor.author | Pérez-Calero Yzquierdo, Antonio | - |
dc.contributor.author | Potterat, Cédric | - |
dc.contributor.author | Rives Molina, Vicente José | - |
dc.contributor.author | Ruiz, Hugo (Ruiz Pérez) | - |
dc.contributor.author | Vázquez Gómez, Ricard | - |
dc.contributor.author | Vilasis-Cardona, Xavier | - |
dc.contributor.author | LHCb Collaboration | - |
dc.date.accessioned | 2019-04-08T12:00:24Z | - |
dc.date.available | 2019-04-08T12:00:24Z | - |
dc.date.issued | 2013-03-01 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131790 | - |
dc.description.abstract | Interpretation of C P violation measurements using charmonium decays, in both the ¯¯¯ B 0 and ¯¯¯ B 0 s systems, can be subject to changes due to "penguin" type diagrams. These effects can be investigated using measurements of the Cabibbo-suppressed ¯¯¯ B 0 → J / ψ π + π − decays. The final state composition of this channel is investigated using a 1.0 fb − 1 sample of data produced in 7 TeV p p collisions at the LHC and collected by the LHCb experiment. A modified Dalitz-plot analysis is performed using both the invariant mass spectra and the decay angular distributions. An improved measurement of the ¯¯¯ B 0 → J / ψ π + π − branching fraction of ( 3.97 ± 0.09 ± 0.11 ± 0.16 ) × 10 − 5 is reported where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty of the branching fraction of the decay B − → J / ψ K − used as a normalization channel. Significant production of f 0 ( 500 ) and ρ ( 770 ) resonances is found in the substructure of the J / ψ π + π − final state, and this indicates that they are viable final states for C P violation studies. In contrast evidence for the f 0 ( 980 ) resonance is not found. This allows us to establish the first upper limit on the branching fraction product B ( ¯¯¯ B 0 → J / ψ f 0 ( 980 ) ) × B ( f 0 ( 980 ) → π + π − ) < 1.1 × 10 − 6 , leading to an upper limit on the absolute value of the mixing angle of the f 0 ( 980 ) with the f 0 ( 500 ) of less than 31°, both at 90% confidence level. | - |
dc.format.extent | 21 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/PhysRevD.87.052001 | - |
dc.relation.ispartof | Physical Review D, 2013, vol. 87, num. 11, p. 052001 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.87.052001 | - |
dc.rights | cc by (c) CERN; LHCb Collaboration, 2013 | - |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | - |
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 | Analysis of the resonant components in ¯¯¯B0→J/ψπ+π− | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 622090 | - |
dc.date.updated | 2019-04-08T12:00:25Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
Files in This Item:
File | Description | Size | Format | |
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622090.pdf | 1.42 MB | Adobe PDF | View/Open |
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