Structure of the decay B¯0s→J/ψπ+π− is studied using data corresponding to 3 fb−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 f′2(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.

Measurement of resonant and CP components in B¯0s→J/ψπ+π− decays

ANDREOTTI, Mirco;CALABRESE, Roberto;FIORE, Marco;FIORINI, Massimiliano;LUPPI, Eleonora;MANZALI, Matteo;PAPPALARDO, Luciano Libero;SAVRIE', Mauro;TELLARINI, Giulia;TOMASSETTI, Luca;
2014

Abstract

Structure of the decay B¯0s→J/ψπ+π− is studied using data corresponding to 3 fb−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 f′2(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
R., Aaij; B., Adeva; M., Adinolfi; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander; S., Ali; G., Alkhazov; P., Alvarez Cartelle;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2099221
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