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Determination of the X(3872) Meson Quantum Numbers

Author(s)
Williams, Michael
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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.
Date issued
2013-05
URI
http://hdl.handle.net/1721.1/79908
Department
Massachusetts Institute of Technology. Department of Physics
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
ISSN
0031-9007
1079-7114

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