IS SCALAR GLUONIUM OBSERVABLE?
Oct, 19846 pages
Published in:
- Phys.Lett.B 150 (1985) 289-294
- Published: 1985
Report number:
- CERN-TH-4030/84
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Abstract: (Elsevier)
We discuss couplings of scalar gluonium σ on the basis of the low energy theorems of broken chiral symmetry and the anomalous trace of the energy—momentum tensor, implemented using a phenomenological lagrangian. Taking the ITEP value of the gluon consensate as input, we find Γ(σ → ππ) ⋍ 0.6 GeV × ( m σ 1 GeV ) 5 and Γ(σ → γγ) ⋍ 90 eV × ( m σ 1 GeV ) 5 , while m σ is undetermined. These results suggest that if the scalar gluonium mass is above 1 GeV, it is probably unobservably wide, while production in γγ collisions is probably too small to be detectable if m σ < 1.5 GeV . We comment on the observability of J / ψ → σ + γ and on the relevance of our results to other gluonia.- QUANTUM CHROMODYNAMICS
- GLUEBALL: DECAY
- DECAY: GLUEBALL
- GLUEBALL: SCALAR
- SYMMETRY BREAKING: CHIRAL
- SCALING: VIOLATION
- TENSOR: ENERGY-MOMENTUM
- FIELD THEORY: LOW-ENERGY THEOREM
- FIELD THEORY: SCALAR
- FIELD THEORY: EFFECTIVE LAGRANGIANS
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