Quantum numbers of the $X(3872)$ state and orbital angular momentum in its $ρ^0 Jψ$ decay

Abstract : Angular correlations in B+→X(3872)K+ decays, with X(3872)→ρ0J/ψ, ρ0→π+π− and J/ψ→μ+μ−, are used to measure orbital angular momentum contributions and to determine the JPC 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 JPC=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 fraction of D wave.
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Physical Review D, American Physical Society, 2015, 92, pp.011102. 〈10.1103/PhysRevD.92.011102〉
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http://hal.in2p3.fr/in2p3-01145866
Contributeur : Sabine Starita <>
Soumis le : lundi 27 avril 2015 - 11:20:33
Dernière modification le : jeudi 18 janvier 2018 - 01:50:48

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Quantum numbers of the $X(3872)$ state and orbital angular momentum in its $ρ^0 Jψ$ decay. Physical Review D, American Physical Society, 2015, 92, pp.011102. 〈10.1103/PhysRevD.92.011102〉. 〈in2p3-01145866〉

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