Charmonium and Systems With Small Hyperfine Splittings
Dec, 1978
16 pages
Published in:
- Phys.Rev.D 20 (1979) 743
Report number:
- UCR-78-6
Citations per year
Abstract: (APS)
The parameters of the simple Coulomb plus linear effective potential with lowest-order relativistic corrections are determined by the charmonium states other than the S01 states and by the leptonic decay widths of Jψ and ψ′. The effective coupling constant αs is found to be 0.21. Within this framework the hyperfine splittings are small and so are the consequent M1 transitions (well below the experimental upper limit of 1.2 keV). The S01 partners of ψ and ψ′ are predicted to be ηc(3020) and ηc′(3638) and are not to be identified with the experimentally uncertain X(2830) and χ(3450). The same effective potential, chainging only the constituent quark mass, gives a good description of the ϒ system. The spin-independent relativistic corrections play an important role in obtaining the equality mϒ′−mϒ≈mψ′−mψ.- CHARMONIUM
- CORRECTION: RELATIVISTIC
- APPROXIMATION: EFFECTIVE POTENTIAL
- QUARK ANTIQUARK: BOUND STATE
- bottom
- QUARK: MASS
- MASS DIFFERENCE: PSI(3700) J/PSI(3100)
- MASS DIFFERENCE: UPSILON(10000) UPSILON(9500)
- MASS SPECTRUM: UPSILON MESONS
- MASS SPECTRUM: PSI MESONS
References(14)
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