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.

Observation of Bˉ0(s)→J/ψf1(1285) decays and measurement of the f1(1285) mixing angle

AURIEMMA, Giulio;SATRIANO, Celestina;
2014-01-01

Abstract

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.
2014
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/78495
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