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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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http://hal.in2p3.fr/in2p3-01145866
Contributor : Sabine Starita <>
Submitted on : Monday, April 27, 2015 - 11:20:33 AM
Last modification on : Friday, November 6, 2020 - 11:44:14 AM

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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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