Eur. Phys. J. A (2005) 26: 159-165
https://doi.org/10.1140/epja/i2005-10170-7

Original Article

Two-scale scalar mesons in nuclei

¹ Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 278-8510, Noda, Japan
² Department of Physics, Saga University, 840-8502, Saga, Japan
³ Physics Division, National Center for Theoretical Sciences, 10617, Taipei, Taiwan
⁴ Thomas Jefferson National Accelerator Facility, 12000 Jefferson Ave., 23606, Newport News, VA, USA

^* e-mail: ksaito@ph.noda-tus.ac.jp

Received: 22 August 2005
Accepted: 17 November 2005
Published online: 1 December 2005

Abstract

We generalize the linear σ model in order to develop a chiral-invariant model of the nuclear structure. The model is natural, and contains not only the usual σ-meson which is the chiral partner of the pion but also a new chiral singlet that is responsible for the medium-range nucleon-nucleon attraction. This approach provides significant advantages in terms of its description of nuclear matter and finite nuclei in comparison with conventional models based on the linear σ model.