Meson mixing from QCD sum rules and its application to the charge symmetry breaking N-N force

1995 ◽  
Author(s):  
T. Meissner
Keyword(s):  
Symmetry Breaking ◽  
Sum Rules ◽  
Charge Symmetry Breaking ◽  
Qcd Sum Rules ◽  
Charge Symmetry ◽  
Meson Mixing

NON-PERTURBATIVE QCD CHARGE ASYMMETRIC CORRECTIONS TO THE NN SCATTERING LENGTHS

1989 ◽  
Vol 04 (08) ◽  
pp. 713-719
Author(s):  
RIAZUDDIN ◽  
FAYYAZUDDIN
Keyword(s):  
Sum Rules ◽  
Experimental Information ◽  
Coupling Constants ◽  
The Other ◽  
Nuclear Forces ◽  
Charge Symmetry Breaking ◽  
Qcd Sum Rules ◽  
Charge Symmetry ◽  
Light Baryon ◽  
Scattering Lengths

The effect of the vacuum asymmetry [Formula: see text] on π0pp and π0nn coupling constants has been estimated in the QCD sum rules approach. This effect can contribute to charge symmetry breaking in nuclear forces (CSB). The experimental information on CSB is used to estimate εd and the other vacuum asymmetry. [Formula: see text]. It is shown that the values of εs larger than 0.3 still allowed by QCD sum rules in light baryon and meson sectors are not possible.

SUBSTRUCTURE EFFECT ON ρ-ω MIXING IN CHARGE-SYMMETRY VIOLATION

1992 ◽  
Vol 07 (32) ◽  
pp. 3037-3043 ◽  
Author(s):  
T. GOLDMAN ◽  
J.A. HENDERSON ◽  
A.W. THOMAS
Keyword(s):  
Symmetry Breaking ◽  
Quark Model ◽  
Quark Mass ◽  
Mass Shell ◽  
Mass Difference ◽  
Charge Symmetry Breaking ◽  
Symmetry Violation ◽  
Charge Symmetry ◽  
A Charge ◽  
Simple Quark Model

In generating a charge-symmetry breaking potential using ρ-ω mixing it is usually assumed that the mixing amplitude is constant (at the on-mass-shell value). Since the exchanged meson is actually far off-shell one must question the validity of this assumption. By constructing a simple quark model in which the mixing is generated by the u-d quark mass difference, we find that the assumption seems to be a very poor one.

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