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dc.contributor.authorAaltonen, Timo Antero
dc.contributor.authorÁlvarez González, Bárbara
dc.contributor.authorAmidei, Dante
dc.contributor.authorAnastassov, Anton
dc.contributor.authorAnnovi, Alberto
dc.contributor.authorAntos, Jaroslav
dc.contributor.authorApollinari, Giorgio
dc.contributor.authorAppel, Jeffrey A.
dc.contributor.authorCasal Laraña, Bruno
dc.contributor.authorCuevas Maestro, Francisco Javier
dc.contributor.authorGómez Gramuglio, Gervasio
dc.contributor.authorPalencia Cortezón, Enrique
dc.contributor.authorRodrigo Anoro, Teresa 
dc.contributor.authorRuiz Jimeno, Alberto 
dc.contributor.authorScodellaro, Luca
dc.contributor.authorVila Álvarez, Iván
dc.contributor.authorVilar Cortabitarte, Rocío 
dc.contributor.authorVizán García, Jesús Manuel
dc.contributor.authorArisawa, Tetsuo
dc.contributor.authorAmerio, Silvia
dc.contributor.otherUniversidad de Cantabriaes_ES
dc.date.accessioned2013-06-04T07:10:10Z
dc.date.available2013-06-04T07:10:10Z
dc.date.issued2012-04-23
dc.identifier.issn1550-7998
dc.identifier.issn1550-2368
dc.identifier.urihttp://hdl.handle.net/10902/2266
dc.description.abstractWe present a measurement of the CP-violating parameter βsJ/ψϕ using approximately 6500 Bs0→J/ψϕ decays reconstructed with the CDF II detector in a sample of pp̅ collisions at √s=1.96  TeV corresponding to 5.2  fb-1 integrated luminosity produced by the Tevatron collider at Fermilab. We find the CP-violating phase to be within the range βsJ/ψϕ∈[0.02,0.52]∪[1.08,1.55] at 68% confidence level where the coverage property of the quoted interval is guaranteed using a frequentist statistical analysis. This result is in agreement with the standard model expectation at the level of about one Gaussian standard deviation. We consider the inclusion of a potential S-wave contribution to the Bs0→J/ψK+K- final state which is found to be negligible over the mass interval 1.009<m(K+K-)<1.028  GeV/c2. Assuming the standard model prediction for the CP-violating phase βsJ/ψϕ, we find the Bs0 decay width difference to be ΔΓs=0.075±0.035(stat)±0.006(syst)  ps-1. We also present the most precise measurements of the Bs0 mean lifetime τ(Bs0)=1.529±0.025(stat)±0.012(syst)  ps, the polarization fractions |A0(0)|2=0.524±0.013(stat)±0.015(syst) and |A∥(0)|2=0.231±0.014(stat)±0.015(syst), as well as the strong phase δ⊥=2.95±0.64(stat)±0.07(syst)  rad. In addition, we report an alternative Bayesian analysis that gives results consistent with the frequentist approach.es_ES
dc.format.extent32 p.es_ES
dc.language.isoenges_ES
dc.publisherAmerican Physical Societyes_ES
dc.rights© 2012 American Physical Societyes_ES
dc.sourcePhysical review. D, Particles, fields, gravitation, and cosmology, vol. 85, iss. 7, art. num. 072002 (2012)es_ES
dc.titleMeasurement of the CP-violating phase βsJ/ψϕ in Bs0→J/ψϕ decays with the CDF II detectores_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherVersionhttp://dx.doi.org/10.1103/PhysRevD.85.072002es_ES
dc.rights.accessRightsopenAccesses_ES
dc.identifier.DOI10.1103/PhysRevD.85.072002
dc.type.versionpublishedVersiones_ES


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