Determination of the X(3872) Meson Quantum Numbers

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) -> pi(+) pi(-) j/psi and J/psi -> pi(+) mu(-). 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.


Published in:
Physical Review Letters, 110, 222001
Year:
2013
Publisher:
College Pk, American Physical Society
ISSN:
0031-9007
Laboratories:




 Record created 2013-10-01, last modified 2018-01-28


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