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[en] We reanalyse the pionic form factor by using perturbative QCD theory and contributions from endpoint regions. We find that the perturbative QCD can be applied to the pionic form factor as Q2>4 GeV2 and they become unreliable as Q2≤4 GeV2. Therefore the applicability of perturbative QCD to the form factor is questionable only as Q2≤4 GeV2. (orig.)
Journal
[en] The current situation on the glueball research is reviewed. The emphases are some qualitative guidances to identify the glueball and several possible candidate states for the glueball which have been discovered in the experiments
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[en] The hadronic decay process J/ψ→V1+x, X→V2+V3, V2, V3→ 2P(or 3P) (here Vi and P stand for vector and pseudoscalar meson, respectively) has been discussed. For the intermediate state X with various spin-parity JP, the corresponding helicity formalism of angular distribution formulas have been presented. They are helpful for determining the spin-parity of the intermediate state in above process by using the J/ψ events obtained from BEPC
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[en] The doubly radiative decay process J/ψ→γX, X→γV, V→2P (or 3P) is discussed. For the intermediate state X with various spin-parity JP, the corresponding helicity formalism of angular distribution formulas and the moments developed from the generalized moment analysis are presented. They are helpful for determining the spin of the intermediate state
Journal
[en] The formulas of moment for J/Ψ decay process J/Ψ→ρρπ in two-state coupling case are given by using the generalized moment analysis and two-state coupling treatment method. It presents a possible way to search for 1-+ exotic state and determine its character in the J/Ψ decay process
Journal
High Energy Physics and Nuclear Physics; ISSN 0254-3052; 
; v. 23(10); p. 954-960
; v. 23(10); p. 954-960
[en] The authors investigate the polarization structure of the process J/ψ →ωf2(1270) and f2(1270) →ππ by using the generalized moment analysis method and give some relations of moments to represent four helicity amplitude ratios of the process
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[en] The glueball interpretation of the ξ (2230) is discussed when the gluon has only the transverse components
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[en] The angular distribution for the process J/ψ → V1 + X,X → + V2, V2 → V2 → 2P or 3P (where V1 and V2 stand for the vector mesons, P is the pseudoscalar meson) are presented. They can be used to distinguish the spin of the boson resonance X and determine the space parity in some special cases
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[en] The possibility that ξ(2230) can be considered as a glueball is discussed. The ratios of the helicity amplitude are calculated. It is shown that ξ(2230) can not be a pure 2++ glueball in S wave (or D wave), but it can be a 4++ glueball in D wave
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