Results 241 to 250 of about 6,937 (251)

Mixtures of quarkonium and gluonium

Physical Review D, 1985
We 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.
Patrick J. O'Donnell, Mariana Frank
openaire   +2 more sources

Heavy quarkonium: progress, puzzles, and opportunities

, 2010
A 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, S. Eidelman, B. Heltsley, R. Vogt, G. Bodwin, E. Eichten, A. Frawley, A. Meyer, R. Mitchell, V. Papadimitriou, P. Petreczky, A. Petrov, P. Robbe, A. Vairo, A. Andronic, R. Arnaldi, P. Artoisenet, G. Bali, A. Bertolin, D. Bettoni, J. Brodzicka, Giacomo Bruno, A. Caldwell, J. Catmore, C. Chang, K. Chao, E. Chudakov, P. Cortese, P. Crochet, A. Drutskoy, U. Ellwanger, P. Faccioli, A. Mokhtar, X. G. Tormo, C. Hanhart, F. Harris, D. Kaplan, S. Klein, H. Kowalski, J. Lansberg, E. Levichev, V. Lombardo, C. Lourenço, F. Maltoni, Á. Ḿocsy, R. Mussa, F. Navarra, M. Negrini, M. Nielsen, S. Olsen, P. Pakhlov, G. Pakhlova, K. Peters, A. Polosa, W. Qian, J. Qiu, G. Rong, M. Sanchis-Lozano, E. Scomparin, P. Senger, F. Simon, F. Simon, S. Stracka, Y. Sumino, M. Voloshin, C. Weiss, H. Wöhri, C. Yuan   +67 more
semanticscholar   +1 more source

Nonsingular quarkonium potential

Physical Review D, 1987
It 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.
openaire   +3 more sources

Hyperfine splitting of quarkonium

Physical Review D, 1985
Using 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.
Keiji Igi, Seiji Ono
openaire   +3 more sources

Cosmic Production of Quarkonium?

Physical Review Letters, 1986
It 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 ...
openaire   +3 more sources

Mass spectrum of heavy quarkonium for screened Kratzer potential (SKP) using series expansion method

The European Physical Journal Plus, 2021
E. E. Ibekwe, U. Okorie, J. B. Emah, E. Inyang, S. Ekong   +4 more
semanticscholar   +1 more source

Relativistic description of quarkonium

Physical Review D, 1987
A 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.
openaire   +3 more sources

Production of scalar-quarkonium int-quarkonium radiative decays

Physical Review D, 1985
We 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.
openaire   +3 more sources

Concavity of the quarkonium potential

Physical Review D, 1986
The 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.
openaire   +3 more sources

Conformable Fractional of the Analytical Exact Iteration Method for Heavy Quarkonium Masses Spectra

Few-body systems, 2021
M. Abu-shady, Sh. Y. Ezz-Alarab
semanticscholar   +1 more source