Radiative decays and might be expected to have a ratio of branching fractions following the phase space volumes ratio. However data suggest the opposite, indicating a value for consistently larger than one. In this paper we present a calculation of for both a compact diquark-antidiquark state and a molecule. In the former case or larger is found. In contrast, in the molecular picture, with and mesons described by the universal wave function used by Voloshin, Braaten and Kusunoki, we find to be of order . These starkly different predictions are to be confronted with forthcoming high-statistics data analyses; a more precise experimental measure would be extremely helpful in clarifying the true nature of the .
Radiative decays of X3872 discriminate between the molecular and compact interpretations / Grinstein, B.; Maiani, L.; Polosa, A. D.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 109:7(2024). [10.1103/physrevd.109.074009]
Radiative decays of X3872 discriminate between the molecular and compact interpretations
Grinstein, B.Membro del Collaboration Group
;Polosa, A. D.Membro del Collaboration Group
2024
Abstract
Radiative decays and might be expected to have a ratio of branching fractions following the phase space volumes ratio. However data suggest the opposite, indicating a value for consistently larger than one. In this paper we present a calculation of for both a compact diquark-antidiquark state and a molecule. In the former case or larger is found. In contrast, in the molecular picture, with and mesons described by the universal wave function used by Voloshin, Braaten and Kusunoki, we find to be of order . These starkly different predictions are to be confronted with forthcoming high-statistics data analyses; a more precise experimental measure would be extremely helpful in clarifying the true nature of the .I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
