scholarly journals Covariant spectator theory of quark-antiquark bound states: Mass spectra and vertex functions of heavy and heavy-light mesons

2017 ◽  
Vol 96 (7) ◽  
Author(s):  
Sofia Leitão ◽  
Alfred Stadler ◽  
M. T. Peña ◽  
Elmar P. Biernat
Keyword(s):  
Mass Spectra ◽  
Bound States ◽  
Covariant Spectator Theory ◽  
Light Mesons ◽  
Covariant Spectator

scholarly journals Application of the Covariant Spectator Theory to the Study of Heavy and Heavy-Light Mesons

2017 ◽  
Vol 58 (2) ◽  
Author(s):  
Sofia Leitão ◽  
Alfred Stadler ◽  
M. T. Peña ◽  
Elmar P. Biernat
Keyword(s):  
Covariant Spectator Theory ◽  
Light Mesons ◽  
Covariant Spectator

scholarly journals Application of the Covariant Spectator Theory to the Study of Heavy and Heavy-Light Mesons

2017 ◽  
pp. 149-156
Author(s):  
Sofia Leitão ◽  
Alfred Stadler ◽  
M. T. Peña ◽  
Elmar P. Biernat
Keyword(s):  
Covariant Spectator Theory ◽  
Light Mesons ◽  
Covariant Spectator

scholarly journals Heavy and Heavy-Light Mesons in the Covariant Spectator Theory

2018 ◽  
Vol 59 (3) ◽  
Author(s):  
Alfred Stadler ◽  
Sofia Leitão ◽  
M. T. Peña ◽  
Elmar P. Biernat
Keyword(s):  
Covariant Spectator Theory ◽  
Light Mesons ◽  
Covariant Spectator

Ground and Excited State Mass Spectra and Properties of Heavy-Light Mesons

2021 ◽  
Vol 62 (2) ◽  
Author(s):  
Mohamed Allosh ◽  
Yasser Mustafa ◽  
Nour Khalifa Ahmed ◽  
Asmaa Sayed Mustafa
Keyword(s):  
Excited State ◽  
Mass Spectra ◽  
Light Mesons

Covariant Spectator Theory and Hadron Structure

2017 ◽  
pp. 97-102
Author(s):  
M. T. Peña ◽  
Sofia Leitão ◽  
Elmar P. Biernat ◽  
Alfred Stadler ◽  
J. E. Ribeiro ◽  
...  
Keyword(s):  
Hadron Structure ◽  
Covariant Spectator Theory ◽  
Covariant Spectator

Confinement and Chiral-Symmetry Breaking in the Covariant Spectator Theory

2015 ◽  
Vol 56 (6-9) ◽  
pp. 389-394
Author(s):  
M. T. Peña ◽  
Elmar P. Biernat ◽  
Alfred Stadler
Keyword(s):  
Symmetry Breaking ◽  
Chiral Symmetry ◽  
Chiral Symmetry Breaking ◽  
Covariant Spectator Theory ◽  
Covariant Spectator

scholarly journals ACCURACY OF APPROXIMATE EIGENSTATES

2000 ◽  
Vol 15 (20) ◽  
pp. 3221-3235 ◽  
Author(s):  
WOLFGANG LUCHA ◽  
FRANZ F. SCHÖBERL
Keyword(s):  
Eigenvalue Problem ◽  
Mass Spectra ◽  
Bound States ◽  
Main Tool ◽  
Bound State ◽  
Variational Techniques ◽  
The Matrix ◽  
Reasonable Choice ◽  
Unperturbed Solution ◽  
New Criteria

Besides perturbation theory, which requires the knowledge of the exact unperturbed solution, variational techniques represent the main tool for any investigation of the eigenvalue problem of some semibounded operator H in quantum theory. For a reasonable choice of the employed trial subspace of the domain of H, the lowest eigenvalues of H can be located with acceptable precision whereas the trial-subspace vectors corresponding to these eigenvalues approximate, in general, the exact eigenstates of H with much less accuracy. Accordingly, various measures for the accuracy of approximate eigenstates derived by variational techniques are scrutinized. In particular, the matrix elements of the commutator of the operator H and (suitably chosen) different operators with respect to degenerate approximate eigenstates of H obtained by the variational methods are proposed as new criteria for the accuracy of variational eigenstates. These considerations are applied to that Hamiltonian the eigenvalue problem of which defines the spinless Salpeter equation. This bound-state wave equation may be regarded as the most straightforward relativistic generalization of the usual nonrelativistic Schrödinger formalism, and is frequently used to describe, e.g. spin-averaged mass spectra of bound states of quarks.

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