T-2, Nuclear and Particle Physics, Astrophysics and Cosmology

Chiral symmetry breaking and stability of strangelets

Shigehiro Yasui
Tokyo Institute of Technology

We discuss stability of strangelets in view of chiral symmetry breaking. For quark droplets of finite volume we formulate the Nambu--Jona-Lasinio model with a basis set of the quark wave functions in the chiral bag model. For strangelets with large baryon number A>10, we use the Multiple Reflection Expansion as an approximate method to consider the boundary condition of the bag. For small baryon numbers, we consider the pion cloud by assuming a strong coupling between pion and quark at the bag surface. Physical quantities of the quark droplets such as masses and radii are obtained from baryon number A=1 to A=10^9. We apply our model setting to the nucleon and discuss the stability of the quark droplets against nuclei.


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