We investigate the color superconducting phase transition in strange quark matter at zero temperature considering the density dependence of quark masses. At high densities, it is well known that cold quark matter is a color superconductor with favorable phase being the color flavor locked (CFL). We analyze the phase transition between the initially strange quark matter (SQM) and the CFL phases. The quark masses are parametrized with the baryon number density nB in the dense system.
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