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dc.contributor.authorHe, Zhi-Guocat
dc.contributor.authorLu, Xiao-Ruicat
dc.contributor.authorSoto Riera, Joancat
dc.contributor.authorZheng, Yanghengcat
dc.description.abstractThe decay mode ψ ( 2 S ) → J / ψ + γ γ is proposed in order to experimentally identify the effects of the coupling of charmonium states to the continuum D ¯¯¯ D states. To have a better understanding of such a two-photon decay process, in this work we restrict ourselves to investigate the contribution of the discrete part, in which the photons are mainly produced via the intermediate states χ c J ( n P ) . Besides calculating the resonance contributions of χ c J ( 1 P ) ( J = 0 , 1 , 2 ) , we also take into account the contributions of the higher excited states χ c J ( 2 P ) and the interference effect among the 1 P and 2 P states. We find that the contribution of the 2 P states and the interference terms to the total decay width is very tiny. However, for specific regions of the Dalitz plot, off the resonance peaks, we find that these contributions are sizable and should also be accounted for. We also provide the photon spectrum and study the polarization of J / ψ .-
dc.description.sponsorshipHadronPhysics2 (Grant Agreement No. 227431) (EU)eng
dc.format.extent9 p.-
dc.publisherAmerican Physical Societyeng
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofPhysical Review D, 2011, vol. 83, núm 5, p. 054028-1-054028-9-
dc.rights(c) American Physical Society, 2011-
dc.subject.classificationReaccions nuclearscat
dc.subject.classificationPartícules (Física)cat
dc.subject.otherNuclear reactionseng
dc.subject.otherParticles (Nuclear physics)eng
dc.titleDiscrete contribution to psi ' -> J/psi plus gamma gammaeng
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Publicacions de projectes de recerca finançats per la UE

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