Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/131518
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dc.contributor.authorGarra Ticó, Jordi-
dc.contributor.authorGraugés Pous, Eugeni-
dc.contributor.authorBABAR Collaboration-
dc.date.accessioned2019-04-05T10:21:29Z-
dc.date.available2019-04-05T10:21:29Z-
dc.date.issued2008-10-17-
dc.identifier.issn1550-7998-
dc.identifier.urihttp://hdl.handle.net/2445/131518-
dc.description.abstractWe report the first observation of e + e − → ρ + ρ − , in a data sample of 379     fb − 1 collected with the BABAR detector at the PEP-II e + e − storage ring at center-of-mass energies near √ s = 10.58     GeV . We measure a cross section of σ ( e + e − → ρ + ρ − ) = 8.3 ± 0.7 ( stat ) ± 0.8 ( syst )     fb within the range of | cos  θ ∗ | < 0.8 and | cos  θ ± | < 0.85 , where θ ∗ is the center-of-mass polar angle of the ρ ± meson and θ ± are the angles in the ρ ± rest frame between the direction of the boost from the laboratory frame and the direction of the π ± . Assuming production through single-photon annihilation, there are three independent helicity amplitudes. We measure the ratios of their squared moduli to be | F 00 | 2 ∶ | F 10 | 2 ∶ | F 11 | 2 = 0.51 ± 0.14 ( stat ) ± 0.07 ( syst ) ∶ 0.10 ± 0.04 ( stat ) ± 0.01 ( syst ) ∶ 0.04 ± 0.03 ( stat ) ± 0.01 ( syst ) . The | F 00 | 2 result is inconsistent with the prediction of 1.0 made by QCD models with a significance of 3.1 standard deviations including systematic uncertainties.-
dc.format.extent9 p.-
dc.format.mimetypeapplication/pdf-
dc.language.isoeng-
dc.publisherAmerican Physical Society-
dc.relation.isformatofReproducció del document publicat a: https://doi.org/10.1103/PhysRevD.78.071103-
dc.relation.ispartofPhysical Review D, 2008, vol. 78, num. 7, p. 071103-
dc.relation.urihttps://doi.org/10.1103/PhysRevD.78.071103-
dc.rights(c) American Physical Society, 2008-
dc.subject.classificationFísica de partícules-
dc.subject.classificationExperiments-
dc.subject.otherParticle physics-
dc.subject.otherExperiments-
dc.titleObservation of e+e−→ρ+ρ− near √s=10.58 GeV-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.identifier.idgrec577676-
dc.date.updated2019-04-05T10:21:29Z-
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess-
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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