What can radiative decays of the X(3872) teach us about its nature?

Starting from the hypothesis that the X(3872) is a DD¯⁎ molecule, we discuss the radiative decays of the X(3872) into γJ/ψ and γψ′ from an effective field theory point of view. We show that radiative decays are very weakly sensitive to the long-range structure of the X(3872). In particular, contrary...

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Bibliographic Details
Published in:Physics letters. B 2015-03, Vol.742, p.394-398
Main Authors: Guo, Feng-Kun, Hanhart, C., Kalashnikova, Yu.S., Meißner, Ulf-G., Nefediev, A.V.
Format: Article
Language:English
Subjects:
Charmonium
Exotic hadrons
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Summary:Starting from the hypothesis that the X(3872) is a DD¯⁎ molecule, we discuss the radiative decays of the X(3872) into γJ/ψ and γψ′ from an effective field theory point of view. We show that radiative decays are very weakly sensitive to the long-range structure of the X(3872). In particular, contrary to earlier claims, we argue that the experimentally determined ratio of the mentioned branching fractions is not in conflict with a wave function of the X(3872) that is dominated by the DD¯⁎ hadronic molecular component.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2015.02.013