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DC Field | Value | Language |
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dc.contributor.author | Camboni, Alessandro | - |
dc.contributor.author | Coquereau, S. | - |
dc.contributor.author | Fernandez, G. | - |
dc.contributor.author | Garrido Beltrán, Lluís | - |
dc.contributor.author | Gascon, D. | - |
dc.contributor.author | Graciani Diaz, Ricardo | - |
dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | Marin Benito, Carla | - |
dc.contributor.author | Picatoste Olloqui, E. | - |
dc.contributor.author | Rives Molina, V. | - |
dc.contributor.author | Sanchez Gonzalo, D. | - |
dc.contributor.author | Alfonso Albero, Alejandro | - |
dc.contributor.author | Calvo Gomez, M. | - |
dc.contributor.author | Gironella Gironell, P. | - |
dc.contributor.author | Vazquez Gomez, R. | - |
dc.contributor.author | LHCb Collaboration | - |
dc.date.accessioned | 2022-06-08T13:36:36Z | - |
dc.date.available | 2022-06-08T13:36:36Z | - |
dc.date.issued | 2017-08 | - |
dc.identifier.issn | 1126-6708 | - |
dc.identifier.uri | http://hdl.handle.net/2445/186476 | - |
dc.description.abstract | A test of lepton universality, performed by measuring the ratio of the branching fractions of the B 0 → K *0 μ + μ - and B 0 → K *0 e + e - decays, {R}_{K^{*0}} , is presented. The K *0 meson is reconstructed in the final state K + π -, which is required to have an invariant mass within 100 MeV /c 2 of the known K *(892)0 mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb-1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q 2, to be {R}_{K^{*0}}= 0.66-+_{0.07}^{0.11}(stat)± 0.03(syst) for .045<{q}^2<1.1 GeV^2/{c}^4, 0.69-+_{0.07}^{0.11}(stat)± 0.05(syst) for 1.1<{q}^2<6.0 GeV^2/{c}^4. The corresponding 95.4% confidence level intervals are [0 .52 , 0 .89] and [0 .53 , 0 .94]. The results, which represent the most precise measurements of {R}_{K^{*0}} to date, are compatible with the Standard Model expectations at the level of 2.1-2.3 and 2.4-2.5 standard deviations in the two q 2 regions, respectively. | - |
dc.format.extent | 31 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Springer Verlag | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1007/JHEP08(2017)055 | - |
dc.relation.ispartof | Journal of High Energy Physics, 2017, vol. 2017, num. 55, p. 1-31 | - |
dc.relation.uri | https://doi.org/10.1007/JHEP08(2017)055 | - |
dc.rights | cc-by (c) Camboni, Alessandro et al., 2017 | - |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Hadrons | - |
dc.subject.classification | Gran Col·lisionador d'Hadrons | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.other | Hadrons | - |
dc.subject.other | Large Hadron Collider (France and Switzerland) | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.title | Test of lepton universality with B 0 → K *0 ℓ + ℓ - decays | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 678010 | - |
dc.date.updated | 2022-06-08T13:36:36Z | - |
dc.relation.projectID | info:eu-repo/grantAgreement/EC/H2020/639068/EU//BSMFLEET | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Publicacions de projectes de recerca finançats per la UE |
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File | Description | Size | Format | |
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678010.pdf | 1.88 MB | Adobe PDF | View/Open |
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