Can the ψ(4040) explain the peak associated with Y(4008)?

  • We study the well-known resonance ψ(4040), corresponding to a 33S1 charm–anticharm vector state ψ(3S), within a QFT approach, in which the decay channels into DD, D∗D, D∗D∗, DsDs and D∗s Ds are considered. The spectral function shows sizable deviations from a Breit–Wigner shape (an enhancement, mostly generated by DD∗loops, occurs); moreover, besides the c ¯ c pole of ψ(4040), a second dynamically generated broad pole at 4 GeV emerges. Naively, it is tempting to identify this new pole with the unconfirmed state Y (4008). Yet, this state was not seen inthe reaction e+e− → ψ(4040) → DD∗, but in processes with π+π−J/ψ in the final state. A detailed study shows a related but different mechanism: a broad peak at 4GeV in the process e+e− → ψ(4040) → DD∗ → π+π−J/ψ appears when DD∗ loops are considered. Its existence in this reaction is not necessarily connected to the existence of a dynamically generated pole, but the underlying mechanism – the strong coupling of c ¯ c to DD∗ loops – can generate both of them. Thus, the controversial state Y (4008) may not be a genuine resonance, but a peak generated by the ψ(4040) and D∗D loops with π+π−J/ψ in the final state.

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Author:Milena Piotrowska, Francesco Giacosa, Peter Kovacs
Parent Title (English):The European physical journal / C
Document Type:Article
Year of Completion:2019
Year of first Publication:2019
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2019/04/04
Page Number:12
First Page:79
Last Page:98
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0