Determination of the X(3872) meson quantum numbers.

Journal article

The quantum numbers of the X(3872) meson are determined to be J(PC)=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 J(PC)=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.

Authors: Aaij, R; Abellan Beteta, C; Adeva, B; Adinolfi, M; Adrover, C

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 110
• Issue: 22
• Pages: 222001
• Publication date: 2013-05-01
• DOI: 10.1103/physrevlett.110.222001
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: LHCb Collaboration