Determination of the X(3872) meson quantum numbers

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Determination of the X(3872) meson quantum numbers. Physical Review Letters, 110(22):222001.

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.

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.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2013 17 Feb 2014 13:27 16 Feb 2018 19:40 American Physical Society 0031-9007 Hybrid https://doi.org/10.1103/PhysRevLett.110.222001

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