scholarly journals Axial current matrix elements and pentaquark decay widths in chiral soliton models

2007 ◽  
Vol 75 (11) ◽  
Author(s):  
H. Weigel
Keyword(s):  
Axial Current ◽  
Matrix Elements ◽  
Chiral Soliton ◽  
Decay Widths

THE CHIRAL QUARK MODEL AND BARYON PHENOMENOLOGY

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1785-1790 ◽  
Author(s):  
D. O. RISKA
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Axial Current ◽  
Chiral Quark Model ◽  
Pion Decay ◽  
Decay Widths ◽  
Nucleon Form Factors ◽  
Baryon Spectra ◽  
Baryon Resonances ◽  
Covariant Quark Model

The chiral quark model posits that pions couple to the axial current of constituent quarks. This chiral pion coupling governs the pion decays of baryon resonances and also implies pion and multipion interactions between the quarks. The qualitative features of this model for the description of pionic decay widths and baryon spectra are outlined. When the covariant quark model wave function for the nucleon is chosen so as to describe the empirical nucleon form factors the pion decay widths of the positive parity resonances are underpredicted. This indicates the presence of significant multiquark components in these resonances.

scholarly journals Energy-Momentum Relocalization, Surface Terms, and Massless Poles in Axial Current Matrix Elements

Symmetry ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1409
Author(s):  
Oleg Teryaev
Keyword(s):  
Spin Structure ◽  
Axial Current ◽  
Translation Invariance ◽  
Matrix Elements ◽  
Hadronic Structure ◽  
Boundary Terms ◽  
Zero Momentum ◽  
Classical Fields ◽  
Classical Gravity ◽  
Specific Impact

The energy-momentum relocalization in classical and quantum theory is addressed with specific impact on non-perturbative QCD and hadronic structure. The relocalization is manifested in the existence of canonical and symmetric (Belinfante and Hilbert) energy momentum tensors (EMT). The latter describes the interactions of hadrons with classical gravity and inertia. Canonical EMT, in turn, is naturally emerging due to the translation invariance symmetry and appears when spin structure of hadrons is considered. Its relation to symmetric Hilbert and Belinfante EMTs requires the possibility to neglect the contribution of boundary terms for the classical fields. For the case of quantum fields this property corresponds to the absence of zero-momentum poles of matrix element of the axial current dual to the spin density. This property is satisfied for quarks manifesting the symmetry counterpart of UA(1) problem and may be violated for gluons due to QCD ghost pole.

scholarly journals On the matrix elements of ΔB=0 operators in the heavy meson decay widths

2009 ◽  
Vol 671 (1) ◽  
pp. 66-70 ◽  
Author(s):  
Damir Bećirević ◽  
Svjetlana Fajfer ◽  
Jernej F. Kamenik
Keyword(s):  
Heavy Meson ◽  
Meson Decay ◽  
Matrix Elements ◽  
Decay Widths ◽  
The Matrix

scholarly journals Axial-Current Matrix Elements in Light Nuclei from Lattice QCD

2017 ◽  
Author(s):  
Martin Savage ◽  
Silas Beane ◽  
Emmanuel Chang ◽  
Zohreh Davoudi ◽  
William Detmold ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Axial Current ◽  
Light Nuclei ◽  
Matrix Elements
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