Decays of Bˉ0(s) and Bˉ0 mesons into J/ψπ+π−π+π− final states, produced in pp collisions at the LHC, are investigated using data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb detector. Bˉ0(s)→J/ψf1(1285) decays are seen for the first time, and the branching fractions are measured. Using these rates, the f1(1285) mixing angle between strange and non-strange components of its wave function in the qq− structure model is determined to be ±(24.0+3.1+0.6−2.6−0.8)∘. Implications on the possible tetraquark nature of the f1(1285) are discussed.
|Titolo:||Observation of Bˉ0(s)→J/ψf1(1285) decays and measurement of the f1(1285) mixing angle|
|Data di pubblicazione:||2014|
|Appare nelle tipologie:||1.1 Articolo su Rivista|