On relativistic approaches to pion self-energy in nuclear matter
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On relativistic approaches to pion self-energy in nuclear matter

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On relativistic approaches to pion self-energy in nuclear matter

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Leinson, L.B.; Pérez Cañellas, Armando
Aquest document és un/a article, creat/da en: 2004

Este documento está disponible también en : http://dx.doi.org/10.1140/epja/i2003-10225-9
We argue that, in contrast to the non-relativistic approach, a relativistic evaluation of the nucleon--hole and delta-isobar--nucleon hole contributions to the pion self-energy incorporates the s-wave scattering, which requires a more accurate evaluation. Therefore relativistic approach containing only these diagrams does not describe appropriately the pion self-energy in isospin symmetric nuclear matter. We conclude that, a correct relativistic approach to the pion self-energy should involve a more sophisticated calculation in order to satisfy the known experimental results on the near-threshold behaviour of the pion-nucleon (forward) scattering amplitude.

    Leinson, L.B. Pérez Cañellas, Armando 2004 On relativistic approaches to pion self-energy in nuclear matter European Physical Journal A 20 371 374
http://dx.doi.org/10.1140/epja/i2003-10225-9
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