A golden age for heavy quarkonium physics dawned at the turn of this century, initiated by the confluence of exciting advances in quantum chromodynamics （QCD） and an explosion of related experimental activity. The s...A golden age for heavy quarkonium physics dawned at the turn of this century, initiated by the confluence of exciting advances in quantum chromodynamics （QCD） and an explosion of related experimental activity. The subsequent broad spectrum of breakthroughs, surprises, and continuing puzzles had not been anticipated. In that period, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavyion collisions at RHIC opened a window on the deconfinement regime. Recently also ATLAS, CMS and LHCb started to contribute to the field. For an extensive presentation of the status of heavy quarkonium physics, the reader is referred to several reviews [1-8]. This note focuses on experimental developments in heavy quarkonium spectroscopy with very few theoretical comments. Some other comments on possible theoretical interpretations of the states not predicted by the quark model are presented in the mini-review on non qq-states.展开更多
The determination of the parameters of the ρ（770） is beset with many difficulties because of its large width. In physical region fits, the line shape does not correspond to a relativistic Breit-Wigner function with...The determination of the parameters of the ρ（770） is beset with many difficulties because of its large width. In physical region fits, the line shape does not correspond to a relativistic Breit-Wigner function with a P-wave width, but requires some additional shape parameter. This dependence on parameterization was demonstrated long ago [1]. Bose-Einstein correlations are another source of shifts in the ρ（770） line shape, particularly in multiparticle final state systems [2].展开更多
In our 1988 edition, we replaced the ρ（1600） entry with two new ones, the ρ（1450） and the ρ（1700）, because there was emerging evidence that the 1600-MeV region actually contains two ρ-like resonances. Erkal ...In our 1988 edition, we replaced the ρ（1600） entry with two new ones, the ρ（1450） and the ρ（1700）, because there was emerging evidence that the 1600-MeV region actually contains two ρ-like resonances. Erkal [1] had pointed out this possibility with a theoretical analysis on the consistency of 2π and 4π electromagnetic form factors and the ππ scattering length. Donnachie [2],展开更多
文摘A golden age for heavy quarkonium physics dawned at the turn of this century, initiated by the confluence of exciting advances in quantum chromodynamics （QCD） and an explosion of related experimental activity. The subsequent broad spectrum of breakthroughs, surprises, and continuing puzzles had not been anticipated. In that period, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavyion collisions at RHIC opened a window on the deconfinement regime. Recently also ATLAS, CMS and LHCb started to contribute to the field. For an extensive presentation of the status of heavy quarkonium physics, the reader is referred to several reviews [1-8]. This note focuses on experimental developments in heavy quarkonium spectroscopy with very few theoretical comments. Some other comments on possible theoretical interpretations of the states not predicted by the quark model are presented in the mini-review on non qq-states.
文摘The determination of the parameters of the ρ（770） is beset with many difficulties because of its large width. In physical region fits, the line shape does not correspond to a relativistic Breit-Wigner function with a P-wave width, but requires some additional shape parameter. This dependence on parameterization was demonstrated long ago [1]. Bose-Einstein correlations are another source of shifts in the ρ（770） line shape, particularly in multiparticle final state systems [2].
文摘In our 1988 edition, we replaced the ρ（1600） entry with two new ones, the ρ（1450） and the ρ（1700）, because there was emerging evidence that the 1600-MeV region actually contains two ρ-like resonances. Erkal [1] had pointed out this possibility with a theoretical analysis on the consistency of 2π and 4π electromagnetic form factors and the ππ scattering length. Donnachie [2],
