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2014-07-09

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cc by (c) CERN; LHCb Collaboration, 2014
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/131206

Measurement of the resonant and CP components in ¯¯B0 → J/ψπ+π− decays

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https://doi.org/10.1103/PhysRevD.90.012003

Resum

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.

Matèries

Física de partícules, Gran Col·lisionador d'Hadrons, Ressonància, Experiments

Matèries (anglès)

Particle physics, Large Hadron Collider (France and Switzerland), Resonance, Experiments

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citació

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. Measurement of the resonant and CP components in ¯¯B0 → J/ψπ+π− decays. _Physical Review D_. 2014. Vol. 90, núm. 1, pàgs. 012003. [consulta: 21 de gener de 2026]. ISSN: 1550-7998. [Disponible a: https://hdl.handle.net/2445/131206]

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