From a study of the line shape of the X(3872), the LHCb collaboration measures a sizeable negative effective range. Thiscannot be reconciled with a shallow DD∗bound state hypothesis. Based on Weinberg’s compositeness criterion, together with atheorem by Smorodinsky, it follows that the Xhas to have a compact hidden charm structure interacting with unbound DD∗pairs via short distance color forces. This conclusion is strengthened by the general pattern recently emerging from exotic mesons.
From the line shape of the X(3872) to its structure / Esposito, Angelo; Maiani, Luciano; Pilloni, Alessandro; Polosa, Antonio D.; Riquer, Verónica. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 105:3(2022). [10.1103/PhysRevD.105.L031503]
From the line shape of the X(3872) to its structure
Esposito, Angelo;Maiani, Luciano;Pilloni, Alessandro;Polosa, Antonio D.;Riquer, Verónica
2022
Abstract
From a study of the line shape of the X(3872), the LHCb collaboration measures a sizeable negative effective range. Thiscannot be reconciled with a shallow DD∗bound state hypothesis. Based on Weinberg’s compositeness criterion, together with atheorem by Smorodinsky, it follows that the Xhas to have a compact hidden charm structure interacting with unbound DD∗pairs via short distance color forces. This conclusion is strengthened by the general pattern recently emerging from exotic mesons.| File | Dimensione | Formato | |
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