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Determination of the X(3872) meson quantum numbers

Abstract : The quantum numbers of the X(3872) meson are determined to be JPC = 1++ based on angular correlations in B+ to X(3872) K+ decays, where X(3872) to pi+pi- J/psi and J/psi to \mu+\mu-. The data correspond to 1.0 fb-1 of pp collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements, JPC=2-+, is rejected with a confidence level equivalent to more than eight Gaussian standard deviations using the likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the X(3872) state.
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Contributor : Sabine Starita <>
Submitted on : Wednesday, February 27, 2013 - 10:37:47 AM
Last modification on : Wednesday, September 16, 2020 - 4:26:28 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Determination of the X(3872) meson quantum numbers. Physical Review Letters, American Physical Society, 2013, 110, pp.222001. ⟨10.1103/PhysRevLett.110.222001⟩. ⟨in2p3-00795045⟩



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