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https://hdl.handle.net/10316/109129
Title: | Unquenched quark-model calculation of X (3872) electromagnetic decays | Authors: | Cardoso, Marco Rupp, George van Beveren, Eef |
Issue Date: | 2015 | Publisher: | Springer Nature | Serial title, monograph or event: | European Physical Journal C | Volume: | 75 | Issue: | 1 | Abstract: | A recent quark-model description of X (3872) as an unquenched 2 3P1 (Formula Presented) state is generalised by now including all relevant meson–meson configurations, in order to calculate the widths of the experimentally observed electromagnetic decays X (3872) → γ J/ ψ and X(3872) → γ ψ (2S). Interestingly, the inclusion of additional two-meson channels, most importantly D ± D ⋆ ∓, leads to a sizeable increase of the (Formula Presented) probability in the total wave function, although the (Formula Presented) component remains the dominant one. As for the electromagnetic decays, unquenching strongly reduces the γ ψ (2S) decay rate; yet it even more sharply enhances the γ J/ψ rate, resulting in a decay ratio compatible with one experimental observation but in slight disagreement with two others. Nevertheless, the results show a dramatic improvement as compared to a quenched calculation with the same confinement force and parameters. Concretely, we obtain Γ(X(3872) →γ ψ(2S) = 28.9 keV and ΓX(3872)→ γJ/ψ = 24.7 keV, with branching ratio R γ ψ = 1.17. | URI: | https://hdl.handle.net/10316/109129 | ISSN: | 1434-6044 1434-6052 |
DOI: | 10.1140/epjc/s10052-014-3254-z | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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