216 citations · 915 across the 25 of their papers we have counts for
23 papers · 1 filter
Spinning Pairs: Supporting Quark-Pair Creation from Landau Gauge Green's Functions
Reinhard Alkofer, Felipe J. Llanes-Estrada, Alexandre Salas-Bernardez
Abundant phenomenology suggests that strong decays from relatively low-excitation hadrons into other hadrons proceed by the creation of a light quark-antiquark pair with zero total…
Dynamical Chiral Symmetry Breaking in Quantum Chromo Dynamics: Delicate and Intricate
Reinhard Alkofer
Dynamical Chiral Symmetry Breaking (DCSB) in Quantum Chromo Dynamics (QCD) for the light quarks is an indispensable concept for understanding hadron physics, i.e., the spectrum and…
Quark Confinement: The Hard Problem of Hadron Physics
R. Alkofer, J. Greensite
We give a brief overview of the problem of quark confinement in hadronic physics, and outline a few of the suggested explanations of the confining force.
The Elusiveness of Infrared Critical Exponents in Landau Gauge Yang--Mills Theories
C. S. Fischer, R. Alkofer, H. Reinhardt
We solve a truncated system of coupled Dyson-Schwinger equations for the gluon and ghost propagators in SU() Yang-Mills theories in Faddeev-Popov quantization on a four-torus.…
Octet and Decuplet Baryons in a Confining and Covariant Diquark-Quark Model
R. Alkofer, S. Ahlig, C. Fischer +2
We treat baryons as bound states of scalar or axialvector diquarks and a constituent quark which interact through quark exchange. We obtain fully four-dimensional wave functions fo…
Diquark confinement in an extended NJL model
G. Hellstern, R. Alkofer, H. Reinhardt
In a Nambu-Jona-Lasinio model supplemented with an infrared cutoff in addition to the ultraviolet cutoff we study the issue whether diquarks are confined when the model is extended…
Strange Nucleons and Hyperons as Chiral Solitons in the NJL Model
R. Alkofer, H. Weigel, H. Reinhardt +1
In the chirally symmetric Nambu--Jona-Lasinio model baryons are described as chiral solitons of mesonic quark--antiquark bound states. Hyperons are investigated in two complementar…
Monopole Excitations of Baryons in the Nambu--Jona--Lasinio Soliton Model
A. Abada, R. Alkofer, H. Reinhardt +1
We investigate the monopole excitations of the soliton in the Nambu--Jona--Lasinio model. By studying the solutions to the corresponding Bethe--Salpeter equation in the background…
On the strange vector form factors of the nucleon in the NJL soliton model
H. Weigel, A. Abada, R. Alkofer +1
Within the Nambu--Jona--Lasinio model strange degrees of freedom are incorporated into the soliton picture using the collective approach of Yabu and Ando. The form factors of the n…
Diquarks in a chiral soliton field
U. Zückert, R. Alkofer, H. Weigel +1
In the Nambu--Jona-Lasinio model baryons are either considered as quark-diquark-composites or the soliton configurations of the model are interpreted as baryons. As a first step to…
Baryons as Chiral Solitons in the Nambu--Jona-Lasinio Model
R. Alkofer, H. Reinhardt, H. Weigel
The description of baryons as chiral solitons of the Nambu--Jona--Lasinio (NJL) model is reviewed. A motivation for the soliton description of baryons is provided from large …
Estimate of Quantum corrections to the Mass of the Chiral Soliton in the Nambu--Jona--Lasinio Model
H. Weigel, R. Alkofer, H. Reinhardt
The Bethe--Salpeter equation for pion fluctuations off the chiral soliton in the Nambu--Jona--Lasinio model is constructed. By Goldstone's theorem this equation has rotational and…
The Skyrmion limit of the Nambu--Jona-Lasinio soliton
U. Zückert, R. Alkofer, H. Reinhardt +1
The special role of the isoscalar mesons ( and ) in the NJL soliton is discussed. Stable soliton solutions are obtained when the most general ansatz compatible with vanishing…
On the analytic properties of chiral solitons in the presence of the --meson
H. Weigel, U. Zückert, R. Alkofer +1
A thorough study is performed of the analytical properties of the fermion determinant for the case that the time components of (axial) vector fields do not vanish. For this purpose…
Topologically non--trivial chiral transformations: The chiral invariant elimination of the axial vector meson
R. Alkofer, H. Reinhardt, J. Schlienz +1
The role of chiral transformations in effective theories modeling Quantum Chromo Dynamics is reviewed. In the context of the Nambu--Jona--Lasinio model the hidden gauge and massive…
Strange S--Wave Excitation of the NJL Soliton
H. Weigel, R. Alkofer, H. Reinhardt
The recently developed method to investigate mesonic fluctuations off the chiral soliton in the Nambu--Jona--Lasinio model is applied to kaons in the S--wave channel. It is shown t…
Hyperons in the Bound State Approach to the Nambu--Jona-Lasinio Chiral Soliton
H. Weigel, R. Alkofer, H. Reinhardt
For the Nambu--Jona--Lasinio (NJL) model in the proper time regularization scheme the chiral soliton is investigated for the case of three flavors within the framework of the bound…
Corrections to in the Light of PCAC$
R. Alkofer, H. Weigel
We comment on recently discovered corrections to the ` nucleon axial current in the framework of the Nambu--Jona-Lasinio soliton. This kind of corrections arises only for a…
The Nambu-Jona-Lasinio Chiral Soliton with Constrained Baryon Number
J. Schlienz, H. Weigel, H. Reinhardt +1
A regularization for the baryon number consistent with the energy in the Nambu-Jona-Lasinio model is introduced. The soliton solution is constructed with the regularized baryon num…
Diquark electromagnetic form factors in a Nambu-Jona-Lasinio model
C. Weiss, A. Buck, R. Alkofer +1
Electromagnetic properties of diquarks are investigated in the framework of a color-octet Nambu-Jona-Lasinio model, which describes baryons as bound states of diquarks and quarks.…
Strange and Non-Strange Meson Fluctuations off the Nambu--Jona-Lasinio Soliton
H. Weigel, H. Reinhardt, R. Alkofer
Mesonic fluctuations off the chiral soliton of the Nambu--Jona-Lasinio model are investigated. The hedgehog configuration is proven to represent a local extremum of the action. The…
The Chiral Soliton of the Nambu Jona-Lasinio Model with Vector and Axial Vector Mesons
U. Zückert, R. Alkofer, H. Reinhardt +1
The self-consistent chiral soliton of the Nambu--Jona-Lasinio model including the and (axial-) vector meson fields besides the chiral angle is investigated. The resulti…
The Chiral Soliton of the Nambu-Jona-Lasinio Model
R. Alkofer
The baryon number one soliton of the NJL model is investigated. The Euclidian effective action is regularized using Schwinger's proper time method. Numerical results for the static…