Results 221 to 230 of about 16,758 (234)
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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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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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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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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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