Abstract
1. Light Scalars as Four-Quark States 2. Isotensor Tensor E(1500 - 1600) State 3. X(3872) State as Charmonium χc1(2P) 4. Two-gluon Annihilation of Charmonium χc2(2P)
Highlights
I would like to discuss the exotic phenomena that I know not by hearsay
The a0(980) and f0(980) mesons became one of the central problems of nonperturbative QCD, as they are important for understanding the way chiral symmetry is realized in the low-energy region and, for understanding confinement
There is much evidence that supports the four-quark model of light scalar mesons [2, 3]
Summary
I would like to discuss the exotic phenomena that I know not by hearsay. That is, the exotic phenomena, which we analyzed, explained and made the new predictions, the considerable part of which is confirmed already by experiment, and other ones wait the experimental checking.The a0(980) and f0(980) mesons are well-established parts of the proposed light scalar meson nonet [1]. There is much evidence that supports the four-quark model of light scalar mesons [2, 3]. The high quality Belle data [5, 6] allowed to elucidate the mechanisms of the σ(600), f0(980), and a00(980) resonance production in γγ collisions confirmed their four-quark structure [7, 8].
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