Electromagnetic Corrections to Pseudo-Scalar Meson Masses from the Perspective of Spontaneously Broken Chiral Symmetry

2020 ◽  
Author(s):  
R. Ling
Keyword(s):  
Chiral Symmetry ◽  
Scalar Meson ◽  
Pseudo Scalar

N* PHYSICS AT MAMI — RESULTS AND PERSPECTIVES

2014 ◽  
Vol 26 ◽  
pp. 1460051
Author(s):  
MICHAEL OSTRICK
Keyword(s):  
Partial Wave ◽  
Scalar Meson ◽  
Crystal Ball ◽  
Preliminary Results ◽  
Model Independent ◽  
Pseudo Scalar ◽  
Photo Production

New measurements of transverse target and beam-target asymmetries in pion photo-production were performed using the Crystal Ball at the Mainz Microtron MAMI. Preliminary results are discussed in the context of model-independent partial wave analyses for pseudo-scalar meson photo-production below Ecm = 2 GeV.

Interactions between Neutron and Proton

1950 ◽  
Vol 3 (4) ◽  
pp. 519
Author(s):  
P Swan
Keyword(s):  
Short Range ◽  
Scalar Meson ◽  
High Energy ◽  
Low Energy ◽  
Scattering Data ◽  
Energy Data ◽  
Central Potential ◽  
Proton Interaction ◽  
Short Range Repulsion ◽  
Pseudo Scalar

An attempt has been made to find an interaction between neutron and proton which will account for not only the binding energy and quadripole moment of the deuteron and the low energy scattering data, but also the results of the experiments on the scattering of 90 MeV. neutrons by protons. Three types of modification of the triplet neutron-proton interaction have been used which embody the following features : (1) A non-central potential of spherical well form, whose radius of interaction is varied. (2) A non-central potential whose form is closer to that of the pseudo-scalar meson potential than the usual Rarita-Schwinger form, but which does not possess the objectionable singularities of the former. (3) The inclusion of a large short-range repulsion. In each case exchange forces of the usual types have been used. The results obtained, like those of other workers in this field using different forms of interaction, fail to agree with the high energy data.

scholarly journals Inverse mass hierarchy of light scalar mesons driven by anomaly-induced flavor breaking

2020 ◽  
Vol 2020 (5) ◽  
Author(s):  
Yoshiki Kuroda ◽  
Masayasu Harada ◽  
Shinya Matsuzaki ◽  
Daisuke Jido
Keyword(s):  
Symmetry Breaking ◽  
Chiral Symmetry ◽  
Scalar Meson ◽  
Chiral Symmetry Breaking ◽  
Linear Sigma Model ◽  
Mass Hierarchy ◽  
Scalar Mesons ◽  
Light Scalar ◽  
Symmetry Breaking Term ◽  
Breaking Term

Abstract We propose a novel mechanism to reproduce the observed mass hierarchy for scalar mesons lighter than 1 GeV (called the inverse hierarchy), regarding them as mesons made of a quark and an anti-quark ($q\bar{q}$ mesons). The source is provided by the SU(3) flavor-symmetry breaking induced by the U(1) axial anomaly. In particular, the anomaly term including the explicit chiral symmetry breaking plays a significant role in the light scalar meson spectrum. To be concrete, we construct a linear sigma model for scalar mesons of $q\bar{q}$ type together with their pseudoscalar chiral partners, including an anomaly-induced explicit chiral symmetry-breaking term. We find that, due to the proposed mechanism, the inverse hierarchy, i.e., $m\left[ a_0 (980) \right] \simeq m\left[ f_0 (980) \right] > m \left[ K_0^\ast (700) \right] > m \left[ f_0(500) \right]$, is indeed realized. Consequently, the quark content of $f_0 (500)$ is dominated by the isoscalar $\bar uu+ \bar dd$ component, and $f_0 (980)$ by the strange quark bilinear one, $s\bar{s}$.

ON THE PHENOMENOLOGICAL σ MODELS

1994 ◽  
Vol 09 (20) ◽  
pp. 3669-3681 ◽  
Author(s):  
N.N. ACHASOV ◽  
G.N. SHESTAKOV
Keyword(s):  
Chiral Symmetry ◽  
Scalar Meson ◽  
Phenomenological Description ◽  
Decay Widths ◽  
Scalar Resonances

The question of the phenomenological description of the broad scalar resonances compatible with chiral symmetry and unitarity is discussed within the linear σ model. It is shown that the naive consideration of the decay widths in the scalar-meson propagators is not an adequate approximation for the physical amplitudes. In this connection Refs. 8–10 are critically discussed. In particular, the K+→ π+π−e+ν and Ks→ππ decays are treated within the linear σ model with due regard for the unitarity.

Meson theory and nuclear matter

1955 ◽  
Vol 230 (1181) ◽  
pp. 277-286 ◽  
Keyword(s):  
Nuclear Matter ◽  
Scalar Meson ◽  
Natural Basis ◽  
Interparticle Forces ◽  
Saturation Properties ◽  
Meson Theory ◽  
Electromagnetic Interactions ◽  
Consistent Field ◽  
Self Consistent Field ◽  
Pseudo Scalar

An attempt is made to justify the use of the concept of a ‘mesic fluid’ in connexion with the structure of nuclear matter. A transformation is made of the usual symmetric pseudo-scalar meson theory to bring into evidence certain saturation properties, which provide a natural basis for the use of a 'self-consistent’ field in the discussion of nuclear structure. Fluctuations about this semi-classical saturated state will give rise to residual interparticle forces within the nucleus, and are also briefly considered in relation to electromagnetic interactions.

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