Interference effect as resonance killer of newly observed charmoniumlike states Y(4320) and Y(4390)

Autor: Dian-Yong Chen, Xiang Liu, Takayuki Matsuki
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: European Physical Journal C: Particles and Fields, Vol 78, Iss 2, Pp 1-6 (2018)
Druh dokumentu: article
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-018-5635-1
Popis: Abstract In this letter, we decode the newly observed charmoniumlike states, Y(4320) and Y(4390), by introducing interference effect between $$\psi (4160)$$ ψ(4160) and $$\psi (4415)$$ ψ(4415) , which plays a role of resonance killer for Y(4320) and Y(4390). It means that two newly reported charmoniumlike states are not genuine resonances, according to which we can naturally explain why two well-established charmonia $$\psi (4160)$$ ψ(4160) and $$\psi (4415)$$ ψ(4415) are missing in the cross sections of $$e^+e^- \rightarrow \pi ^+ \pi ^- J/\psi $$ e+e-→π+π-J/ψ and $$\pi ^+ \pi ^- h_c$$ π+π-hc simultaneously. To well describe the detailed data of these cross sections around $$\sqrt{s}=4.2$$ s=4.2 GeV, our study further illustrates that a charmoniumlike structure Y(4220) must be introduced. As a charmonium, Y(4220) should dominantly decay into its open-charm channel $$e^+e^- \rightarrow D^0 \pi ^+ D^{*-}$$ e+e-→D0π+D∗- , which provides an extra support to $$\psi (4S)$$ ψ(4S) assignment to Y(4220). In fact, this interference effect introduced to explain Y(4320) and Y(4390) gives a typical example of non-resonant explanations to the observed XYZ states, which should be paid more attention especially before identifying the observed XYZ states as genuine resonances.
Databáze: Directory of Open Access Journals
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