Mass shift of σ-meson in nuclear matter

Morones Ibarra, José Rubén y Menchaca Maciel, Mónica del Carmen y Santos Guevara, Ayax y Robledo Padilla, Felipe Ángel (2013) Mass shift of σ-meson in nuclear matter. Pramana, 80 (3). pp. 479-485. ISSN 0304-4289

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Resumen

The propagation of σ-meson in nuclear matter is studied in the Walecka model, by assuming that the sigma couples to a pair of nucleon–antinucleon states and to particle–hole states. The in-medium effect of σ–ω mixing is also studied. For completeness, the coupling of sigma to two virtual pions was also considered. It is found that the σ-meson mass decreases with respect to its value in vacuum and that the contribution of the σ–ω mixing effect on the mass shift is relatively small.

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