σ and ω meson propagation in a dense nuclear medium

σ and ω meson propagation in a dense nuclear medium

Meson masses in a dense nuclear medium

The masses of the scalar (σ) and vector (ω) mesons and their widths in nuclear matter are studied in detail using the quark-meson coupling (QMC) model. It is shown that above normal nuclear matter density the effects of σ-ω mixing and the decay of the σ into 2π change the scalar meson mass considerably, while the vector meson mass remains near its mean-field value. We compare the QMC results wi...

Spectral change of σ and ω mesons in a dense nuclear medium

Spectral change of σ and ω mesons in a dense nuclear medium Abstract The spectra of the scalar (σ) and vector (ω) mesons in nuclear matter are studied in detail using the quark-meson coupling (QMC) model. It is shown that above normal nuclear matter density the effects of σ-ω mixing and the decay of the σ into 2π change the spectra of σ and ω mesons considerably. As in Quantum Hadrodynamics we ...

Vector Meson in Nuclear Medium

Vector mesons immersed in nuclear medium are expected to change their properties due to partial chiral symmetry restoration and/or many body nuclear effects. Expected changes range from the decrease in the mass,1),2) increase in the width,3)–7) and appearance of new structures,8),9) every aspect of which if measured will lead to a new understanding of strong interaction. Several experiments are...

Coherent Neutrino Propagation in a Dense Medium

Motivated by the effect of matter on neutrino oscillations (the MSW effect) we have studied the propagation of neutrinos in a dense medium. The dispersion relation for massive neutrinos in a medium is known to have a minimum at nonzero momentum p ∼ GF ρ/ √ 2. We have studied in detail the origin and consequences of this dispersion relation for both Dirac and Majorana neutrinos both in a toy mod...