Results 251 to 260 of about 20,529 (272)
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Mixtures of quarkonium and gluonium
Physical Review D, 1985We study the 2\ensuremath{\gamma} decays of the light pseudoscalar mesons in a model that allows the isoscalar states to have a significant gluonium component, and show that the rates are in good agreement with experiment. The amount of radial mixing in \ensuremath{\eta},\ensuremath{\eta}' states determines these decays completely.
, Frank, , O'Donnell
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Relativistic quarkonium dynamics
Physical Review D, 1986We present, in the framework of relativistic quantum mechanics of two interacting particles, a general model for quarkonium systems satisfying the following four requirements: confinement, spontaneous breakdown of chiral symmetry, soft explicit chiral-symmetry breaking, short-distance interactions of the vector type.
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Hyperfine splitting of quarkonium
Physical Review D, 1985Using a QCD-motivated model we show that (M( /sup 3/S/sub 1/))/sup 2/-(M( /sup 1/S/sub 0/ ))/sup 2/ is nearly constant for all quarkonium states. We find that the acceptable range of the QCD scale parameter to explain the weak quark-mass dependence of (M( /sup 3/S/sub 1/))/sup 2/-(M( /sup 1/S/sub 0/ ))/sup 2/ is ..lambda.. = 140 +- 60 MeV.
, Igi, , Ono
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Production of scalar-quarkonium int-quarkonium radiative decays
Physical Review D, 1985We consider the production of the $^{1}\mathrm{S}_{0}$ bound state of scalar top quarks in the radiative decays of $^{3}\mathrm{S}_{1}$ t-quarkonium. We find that branching ratios as large as 0.1% can be obtained for certain supersymmetric-particle masses.
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Nonsingular quarkonium potential
Physical Review D, 1987It is shown that the appearance of singular terms in the quasistatic potential models of quarkonium can be avoided with the use of an improved quasistatic approximation, which yields a nonsingular quark-antiquark potential.
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Cosmic Production of Quarkonium?
Physical Review Letters, 1986It has been suggested that pair annihilation of heavy Majorana fermions in the galactic halo into quarkonium plus a monochromatic photon could occur at an observable rate. Here we show that a calculation of Srednicki, Theisen, and Silk seriously overestimates the rate for this process, by an ordre of magnitude or more, as a result of neglecting the ...
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Relativistic description of quarkonium
Physical Review D, 1987A relativistic (four-spinor) model Hamiltonian for quarkonium is proposed in the context of the two-particle Dirac equation. Identification of the usual linear potential as an effective mass leads to a very successful global description of quarkonium as characterized by the spectrum of meson states.
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Heavy quarkonium: progress, puzzles, and opportunities
, 2010A golden age for heavy-quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity.
N. Brambilla +67 more
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Concavity of the quarkonium potential
Physical Review D, 1986The heavy-quark--antiquark potential is shown to be a monotone nondecreasing and concave function of the separation. This property holds independent of the gauge group and the details of the matter sector.
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Mass spectrum of heavy quarkonium for screened Kratzer potential (SKP) using series expansion method
The European Physical Journal Plus, 2021E. E. Ibekwe +4 more
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