Four sorts of meson

By D. Bugg. 2004

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Abstract An extensive spectrum of light non-strange q q states up to a mass of 2400 MeV has emerged from Crystal Barrel and PS172 data on p p→Resonance→A+B in 17 final states. These data are reviewed with detailed comments on the status of each resonance. For I =0, C =+1, the spectrum is complete and very secure. Six ‘extra’ states are identified. Four of them have I =0, C =+1 and spin-parities predicted for glueballs. Their mass ratios agree closely with predictions from lattice QCD calculations. However, branching ratios for decays are not flavour blind and require mixing with neighbouring q q states. This mixing remains controversial. Two further states, η 2 (1870) and π 2 (1880), are candidates for a pair of hybrids. Their decay branching ratios BR [ η 2 (1870)→ f 2 (1270) η ]/ BR [ η 2 (1870)→ a 2 (1320) π ] and BR [ π 2 (1880)→ a 2 (1320) η ]/ BR [ π 2 (1880)→ f 2 (1270) π ] are much larger than predicted by SU (3) for q q states. A fourth category of anomalously light 0 + mesons is made of σ (540), κ (750), a 0 (980) and f 0 (980), forming a non- q q nonet. Their properties are reviewed using data from both Crystal Barrel and elsewhere.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d4e977fea7847b9bafa299700677e2728b34dc5a

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