Determination of the X(3872) meson quantum numbers

The LHCb Collaboration

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246 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number222001
Number of pages8
JournalPhysical Review Letters
Volume110
Issue number22
DOIs
Publication statusPublished - 29 May 2013
Externally publishedYes

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