Abstract
We give a direct method for calculating the quark-number susceptibility at finite chemical potential and zero temperature. In this approach the quark-number susceptibility is totally determined by G[μ](p) (the dressed quark propagator at finite chemical potential μ). By applying the general result in our previous study [Phys. Rev. C 71 (2005)015205, 034901, 73 (2006) 016004] G[μ](p) is calculated from the model quark propagator proposed by Pagels and Stokar [Phys. Rev. D 20 (1979) 2947]. The full analytic expression of the quark-number susceptibility at finite μ and zero T is obtained.
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