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research article
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.
Type
research article
Web of Science ID
WOS:000319682200007
Authors
Aaij, R.
•
Abellan Beteta, C.
•
Adeva, B.
•
Adinolfi, M.
•
Adrover, C.
•
Affolder, A.
•
Ajaltouni, Z.
•
Albrecht, J.
•
Alessio, F.
•
Alexander, M.
Corporate authors
LHCb Collaboration
Publication date
2013
Publisher
Published in
Volume
110
Article Number
222001
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
October 1, 2013
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