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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 Ressonància Experiments Particle physics Large Hadron Collider (France and Switzerland) Resonance Experiments |
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: https://doi.org/10.1103/PhysRevD.90.012003 |
It is part of: | Physical Review D, 2014, vol. 90, num. 1, p. 012003 |
URI: | http://hdl.handle.net/2445/131206 |
Related resource: | https://doi.org/10.1103/PhysRevD.90.012003 |
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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