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research article
From the line shape of the X(3872) to its structure
February 14, 2022
From a study of the line shape of the X(3872), the LHCb collaboration measures a sizeable negative effective range. This cannot be reconciled with a shallow D (D) over bar* bound state hypothesis. Based on Weinberg's compositeness criterion, together with a theorem by Smorodinsky, it follows that the X has to have a compact hidden charm structure interacting with unbound D (D) over bar* pairs via short-distance color forces. This conclusion is strengthened by the general pattern recently emerging from exotic mesons.
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Type
research article
Web of Science ID
WOS:000761169100005
Authors
Publication date
2022-02-14
Publisher
Published in
Volume
105
Issue
3
Article Number
L031503
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
March 28, 2022