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Title: Measurement of resonant and CP components in ¯B0s → J/ψπ+π− decays
Author: 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
Keywords: Física de partícules
Gran Col·lisionador d'Hadrons
Particle physics
Large Hadron Collider (France and Switzerland)
Issue Date: 14-May-2014
Publisher: American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2014, vol. 89, num. 9, p. 092006
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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