Structure of the decay B̄s0→J/ψπ+π- is studied using data corresponding to 3fb-1 of integrated luminosity from pp collisions produced by the LHC and collected by the LHCb detector. Five interfering π+π- states are required to describe the decay: f0(980),f0(1500),f0(1790),f2(1270), and f2′(1525). An alternative model including these states and a nonresonant J/ψπ+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 CP odd. The CP-even part is found to be <2.3% at a 95% confidence level. The f0(500) state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f0(980) of <7.7° at a 90% confidence level, consistent with a tetraquark interpretation of the f0(980) substructure. © 2014 CERN, for the LHCb Collaboration.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Albrecht, J., et al. (2014). Measurement of resonant and CP components in B ̄ s0 →j /ψπ+π- decays measurement of resonant and CP components ⋯ R. AAIJ et al. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(9) [10.1103/PhysRevD.89.092006].

Measurement of resonant and CP components in B ̄ s0 →j /ψπ+π- decays measurement of resonant and CP components ⋯ R. AAIJ et al

Borsato, M;CALVI, MARTA;CASSINA, LORENZO;KHANJI, BASEM;KUCHARCZYK, MARCIN;Martinelli, M;PESSINA, GIANLUIGI EZIO;
2014

Abstract

Structure of the decay B̄s0→J/ψπ+π- is studied using data corresponding to 3fb-1 of integrated luminosity from pp collisions produced by the LHC and collected by the LHCb detector. Five interfering π+π- states are required to describe the decay: f0(980),f0(1500),f0(1790),f2(1270), and f2′(1525). An alternative model including these states and a nonresonant J/ψπ+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 CP odd. The CP-even part is found to be <2.3% at a 95% confidence level. The f0(500) state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f0(980) of <7.7° at a 90% confidence level, consistent with a tetraquark interpretation of the f0(980) substructure. © 2014 CERN, for the LHCb Collaboration.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
2014
89
9
092006
none
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Albrecht, J., et al. (2014). Measurement of resonant and CP components in B ̄ s0 →j /ψπ+π- decays measurement of resonant and CP components ⋯ R. AAIJ et al. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(9) [10.1103/PhysRevD.89.092006].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/61322
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