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Quantum numbers of the X (3872 ) state and orbital angular momentum in its ρ0J /ψ decay
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Angular correlations in B+ → X(3872)K+ decays, with X(3872) → ρ 0J/ψ, ρ 0 → π +π − and J/ψ → µ +µ −, are used to measure orbital angular momentum contributions and to determine the J P C value of the X(3872) meson. The data correspond to an integrated luminosity of 3.0 fb−1 of proton-proton collisions collected with the LHCb detector. This determination, for the first time performed without assuming a value for the orbital angular momentum, confirms the quantum numbers to be J P C = 1++. The X(3872) is found to decay predominantly through S wave and an upper limit of 4% at 95% C.L. is set on the D-wave contribution.
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BADALOV, A., et al. Quantum numbers of the X (3872 ) state and orbital angular momentum in its ρ0J /ψ decay. Physical Review D. 2015. Vol. 92, num. 011102, pags. 1-24. ISSN 2470-0010. [consulted: 11 of October of 2026]. Available at: https://hdl.handle.net/2445/185665