TY  - JOUR
A1  - Piotrowska, Milena
A1  - Giacosa, Francesco
A1  - Kovacs, Peter
T1  - Can the ψ(4040) explain the peak associated with Y(4008)?
T2  - The European physical journal / C
N2  - 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.
Y1  - 2019
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/49916
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-499168
VL  - 79
IS  - 2
SP  - 79
EP  - 98
ER  -