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Título:	Measurement of the resonant and CP components in ¯¯B0 → J/ψπ+π− decays
Autor/a:	Badalov, Alexey; Calvo Gómez, Míriam; Camboni, Alessandro; Garrido Beltrán, Lluís; Graciani Díaz, Ricardo; Graugés Pous, Eugeni; Marin Benito, Carla; Picatoste Olloqui, Eduardo; Rives Molina, Vicente José; Ruiz, Hugo (Ruiz Pérez); Vilasis-Cardona, Xavier; LHCb Collaboration
Otros autores:	Universitat de Barcelona
Abstract:	The resonant structure of the reaction ¯ B 0 → J / ψ π + π − is studied using data from 3     fb − 1 of integrated luminosity collected by the LHCb experiment, one third at 7 TeV center-of-mass energy and the remainder at 8 TeV. The invariant mass of the π + π − pair and three decay angular distributions are used to determine the fractions of the resonant and nonresonant components. Six interfering π + π − states, ρ ( 770 ) , f 0 ( 500 ) , f 2 ( 1270 ) , ρ ( 1450 ) , ω ( 782 ) and ρ ( 1700 ) , are required to give a good description of invariant mass spectra and decay angular distributions. The positive and negative charge parity fractions of each of the resonant final states are determined. The f 0 ( 980 ) meson is not seen and the upper limit on its presence, compared with the observed f 0 ( 500 ) rate, is inconsistent with a model where these scalar mesons are formed from two quarks and two antiquarks (tetraquarks) at the eight standard deviation level. In the q ¯ q model, the absolute value of the mixing angle between the f 0 ( 980 ) and the f 0 ( 500 ) scalar mesons is limited to be less than 17° at 90% confidence level.
Materia(s):	-Física de partícules -Gran Col·lisionador d'Hadrons -Ressonància -Experiments -Particle physics -Large Hadron Collider (France and Switzerland) -Resonance -Experiments
Derechos:	cc by (c) CERN; LHCb Collaboration, 2014 http://creativecommons.org/licenses/by/3.0/es/
Tipo de documento:	Artículo Artículo - Versión publicada
Editor:	American Physical Society
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