Determination of the X(3872) Meson Quantum Numbers
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Aaij-2013-Meson.pdf
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Author(s)
Williams, Michael
Date Issued
May 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, et al. “Determination of the X(3872) Meson Quantum Numbers.” Physical Review Letters 110, no. 22 (May 2013). © 2013 CERN
Version
Final published version
Abstract
The quantum numbers of the X(3872) meson are determined to be J[superscript PC]=1[superscript ++] based on angular correlations in B[superscript +]→X(3872)K[superscript +] decays, where X(3872)→π[superscript +]π[superscript -]J/ψ and J/ψ→μ[superscript +]μ[superscript -]. The data correspond to 1.0 fb[superscript -1] of pp collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements J[superscript PC]=2[superscript -+] 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.222001
