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Determination of the X(3872) meson quantum numbers

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Original languageEnglish
JournalPhysical Review Letters
Volume110, 222001
Early online date25 Feb 2013
Publication statusPublished - 29 May 2013


The quantum numbers of the X(3872) meson are determined to be JPC=1++ based on angular correlations in B+→X(3872)K+ decays, where X(3872)→π+π-J/ψ and J/ψ→μ+μ-. 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 8 Gaussian standard deviations using a likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the X(3872) state.

ID: 8295014