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Title: Measurement of the resonant and CP components in ¯¯B0 → J/ψπ+π− decays
Author: 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
Keywords: Física de partícules
Gran Col·lisionador d'Hadrons
Particle physics
Large Hadron Collider (France and Switzerland)
Issue Date: 9-Jul-2014
Publisher: American Physical Society
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.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2014, vol. 90, num. 1, p. 012003
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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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