Resumen
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.
Idioma original | English |
---|---|
Número de artículo | 092006 |
Publicación | Physical Review D - Particles, Fields, Gravitation and Cosmology |
Volumen | 89 |
N.º | 9 |
DOI | |
Estado | Published - 14 may 2014 |
Publicado de forma externa | Sí |
All Science Journal Classification (ASJC) codes
- Física nuclear y de alta energía
- Física y astronomía (miscelánea)