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Determination of the X(3872) meson quantum numbers
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LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2013) Determination of the X(3872) meson quantum numbers. Physical Review Letters, Volume 110 (Number 22). Article number 222001 . doi:10.1103/PhysRevLett.108.241801 ISSN 0031-9007.
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WRAP_LCHb_PhysRevLett.110.222001.pdf - Published Version Available under License Creative Commons Attribution. Download (485Kb) |
Official URL: http://dx.doi.org/10.1103/PhysRevLett.110.222001
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
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