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Measurement of resonant and CP components in ¯B0s → J/ψπ+π− decays Badalov, Alexey Camboni, Alessandro Calvo Gómez, Míriam Comerma Montells, Albert Garrido Beltrán, Lluís Graciani Díaz, Ricardo Graugés Pous, Eugeni Oyanguren Campos, Arantza de Picatoste Olloqui, Eduardo Potterat, Cédric Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Ruiz Valls, Pablo Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Gran Col·lisionador d'Hadrons Particle physics Large Hadron Collider (France and Switzerland) Structure of the decay ¯ B 0 s → J / ψ π + π − is studied using data corresponding to 3   fb − 1 of integrated luminosity from p p collisions produced by the LHC and collected by the LHCb detector. Five interfering π + π − states are required to describe the decay: f 0 ( 980 ) , f 0 ( 1500 ) , f 0 ( 1790 ) , f 2 ( 1270 ) , and f ′ 2 ( 1525 ) . An alternative model including these states and a nonresonant J / ψ π + π − component also provides a good description of the data. Based on the different transversity components measured for the spin-2 intermediate states, the final state is found to be compatible with being entirely C P odd. The C P -even part is found to be < 2.3 % at a 95% confidence level. The f 0 ( 500 ) state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f 0 ( 980 ) of < 7. 7 ∘ at a 90% confidence level, consistent with a tetraquark interpretation of the f 0 ( 980 ) substructure. 2019-04-02T11:08:55Z 2019-04-02T11:08:55Z 2014-05-14 2019-04-02T11:08:55Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1550-7998 https://hdl.handle.net/2445/131205 645768 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.89.092006 Physical Review D, 2014, vol. 89, num. 9, p. 092006 https://doi.org/10.1103/PhysRevD.89.092006 cc by (c) CERN & LHCb Collaboration, 2014 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess 21 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)