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We study the quark mass dependence of various response functions, whichcontribute to chiral susceptibilities and the specific heat in the staggeredfermion formulation of two-flavour QCD. This yields information about thecritical exponents $\alpha$, $\beta$ and $\delta$. In the case of the chiralsusceptibility, obtained as derivative of the chiral order parameter withrespect to the quark mass, we calculate all contributions. This allows toconstruct a cumulant of the order parameter, which is a scaling function andyields a direct determination of the critical exponent $\delta$. All ourresults are consistent with a second order phase transition.Comment: 16 pages (TeX file) + 7 figures (appended as ps-files), uuencoded,  Bielefeld preprint, BI-TP 94/29, June 199

Susceptibilities, the specific heat, and a cumulant in two-flavor QCD