Zobrazeno 1 - 10
of 242
pro vyhledávání: '"Stadler, Alfred"'
The well-known Cornell quark-antiquark potential in momentum space contains singularities both in its one-gluon-exchange (OGE) and linear confining parts, which prevents a direct use of the convenient Nystr\"om method to solve the corresponding bound
Externí odkaz:
http://arxiv.org/abs/2407.21789
We explore a new method to calculate the valence light-front wave function of a system of two interacting particles, which is based on contour deformations combined with analytic continuation methods to project the Bethe-Salpeter wave function onto t
Externí odkaz:
http://arxiv.org/abs/2112.04858
Publikováno v:
Phys. Rev. D 100, 094001 (2019)
We employ a scalar model to exemplify the use of contour deformations when solving Lorentz-invariant integral equations for scattering amplitudes. In particular, we calculate the onshell 2 -> 2 scattering amplitude for the scalar system. The integral
Externí odkaz:
http://arxiv.org/abs/1907.05402
We present results for the quark mass function in Minkowski space calculated from an interaction kernel that consists of an effective one-gluon-exchange and a constant interaction. We analyze the gauge dependence of our results and compare them in th
Externí odkaz:
http://arxiv.org/abs/1904.07711
Publikováno v:
Phys. Rev. D 98, 114033 (2018)
We present first results for the quark mass function in Minkowski space in both the spacelike and timelike regions calculated from the same quark-antiquark interaction kernel used in the latest meson calculations using the Gross equation. This kernel
Externí odkaz:
http://arxiv.org/abs/1811.01003
The masses and vertex functions of heavy and heavy-light mesons, described as quark-antiquark bound states, are calculated with the Covariant Spectator Theory (CST). We use a kernel with an adjustable mixture of Lorentz scalar, pseudoscalar, and vect
Externí odkaz:
http://arxiv.org/abs/1803.00519
We solve a Minkowski-space integral equation, derived in the Covariant Spectator Theory, for quark-antiquark bound states describing heavy and heavy-light mesons. The equation's kernel contains a one-gluon exchange interaction and a covariant general
Externí odkaz:
http://arxiv.org/abs/1708.08862
We use the covariant spectator theory with an effective quark-antiquark interaction, containing Lorentz scalar, pseudoscalar, and vector contributions, to calculate the masses and vertex functions of, simultaneously, heavy and heavy-light mesons. We
Externí odkaz:
http://arxiv.org/abs/1707.09303
Autor:
Leitão, Sofia, Li, Yang, Maris, Pieter, Peña, M. T., Stadler, Alfred, Vary, James P., Biernat, Elmar P.
In this work we compare mass spectra and decay constants obtained from two recent, independent, and fully relativistic approaches to the quarkonium bound-state problem: the Hamiltonian basis light-front quantization (BLFQ) approach, where light-front
Externí odkaz:
http://arxiv.org/abs/1705.06178
As an application of the Covariant Spectator Theory (CST) we calculate the spectrum of heavy-light and heavy-heavy mesons using covariant versions of a linear confining potential, a one- gluon exchange, and a constant interaction. The CST equations p
Externí odkaz:
http://arxiv.org/abs/1702.07702