V.V. Anisovich

Further amplitude analysis of JΨ → γ(π+π−π+π−)

Abstract Mark III data on J Ψ → γ(π + π − π + π − ) have been re-analysed including γσσ final states as well as γϱϱ. Here σ stands for the ππ S-wave amplitude. We fit with I = 0 resonances having JPC = 2++ at 1275 MeV, 0−+ at 1420 MeV, 0++ at 1505 MeV, 2++ at 1640 MeV, 0++ at 1750 MeV and 0++ at 2104 MeV. The 0++ resonances decay dominantly to σσ and the 2++ resonances to ϱϱ.

Further amplitude analysis of J / psi ---> gamma (pi+ pi- pi+ pi-)

Abstract Mark III data on J Ψ → γ(π + π − π + π − ) have been re-analysed including γσσ final states as well as γϱϱ. Here σ stands for the ππ S-wave amplitude. We fit with I = 0 resonances having JPC = 2++ at 1275 MeV, 0−+ at 1420 MeV, 0++ at 1505 MeV, 2++ at 1640 MeV, 0++ at 1750 MeV and 0++ at 2104 MeV. The 0++ resonances decay dominantly to σσ and the 2++ resonances to ϱϱ.

Quark structure of the pion and pion form-factor

We consider the pion structure in the region of low and moderately high momentum transfers: at low

η — η′ glueball mixing from photon-meson transition form factors and the decay ratio Ds → ηlv/η′lv

Q^2

Quark content of f0(980) from the decay ratios into ππ, KK̄ and γγ

, the pion is treated as a composite system of constituent quarks; at moderately high momentum transfers,

Partial widths a0(980)→γγ, f0(980)→γγ and -classification of the lightest scalar mesons

Q^2=10\div25\;GeV^2

Estimation of the radii of the scalar/isoscalar mesons f0(980), f0(1300) and broad state f0(1530−250+90)

, the pion \ff is calculated within perturbative QCD taking into account one--gluon hard exchange. Using the data on pion \ff at

Wide-angle hadron-nucleus collisions at intermediate energies. Colour transparency or nuclear filter?

Q^2<3\;GeV^2

Pomeron in diffractive processes gamma*(Q**2)p ---> rho0 p and gamma*(Q**2)p ---> gamma*(Q**2)p at large Q**2: The Onset of pQCD

and pion axial--vector decay constant, we reconstruct the pion \wf in the soft and intermediate regions. This very wave function combined with one--gluon hard scattering amplitude allows a calculation of the pion \ff in the hard region

Systematics of q anti-q states in the (n, M**2) and (J, M**2) planes

Q^2=10\div25\;GeV^2