Discrete contribution to {psi}{sup '}{yields}J/{psi}+{gamma}{gamma}

Journal Article · Tue Mar 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.054028· OSTI ID:21537433

Zhiguo, He; Soto, Joan ^[1]; Xiaorui, Lu; Yangheng, Zheng ^[2]

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1. Departament d'Estructura i Constituents de la Materia and Institut de Ciencies del Cosmos, Universitat de Barcelona, Diagonal, 647, E-08028 Barcelona, Catalonia (Spain)
2. Physics Department, Graduate University of Chinese Academy of Sciences, Beijing, 100049 (China)

The decay mode {psi}(2S){yields}J/{psi}+{gamma}{gamma} is proposed in order to experimentally identify the effects of the coupling of charmonium states to the continuum D{bar 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 {chi}{sub cJ}(nP). Besides calculating the resonance contributions of {chi}{sub cJ}(1P)(J=0,1,2), we also take into account the contributions of the higher excited states {chi}{sub cJ}(2P) and the interference effect among the 1P and 2P states. We find that the contribution of the 2P 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/{psi}.

• OSTI ID: 21537433
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevD.83.054028; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING
DALITZ PLOT
EXCITED STATES
GAMMA RADIATION
INTERFERENCE
J PSI-3097 MESONS
MESONS
P STATES
PARTICLE DECAY
PHOTONS
POLARIZATION
RESONANCE
SPECTRA
BOSONS
CHARMONIUM
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DIAGRAMS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
HADRONS
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IONIZING RADIATIONS
MASSLESS PARTICLES
QUARKONIUM
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VECTOR MESONS