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Abstract: We study the equation of state in two-flavor QCD at finite temperature anddensity. Simulations are made with the RG-improved gluon action and theclover-improved Wilson quark action. Along the lines of constant physics for$m { m PS}-m { m V} = 0.65$ and 0.80, we compute the derivatives of the quarkdeterminant with respect to the quark chemical potential $\mu q$ up to thefourth order at $\mu q=0$. We adopt several improvement techniques in theevaluation. We study thermodynamic quantities and quark number susceptibilitiesat finite $\mu q$ using these derivatives. We find enhancement of the quarknumber susceptibility at finite $\mu q$, in accordance with previousobservations using staggered-type quarks. This suggests the existence of anearby critical point.



Author: S. Aoki, S. Ejiri, T. Hatsuda, N. Ishii, K. Kanaya, Y. Maezawa, N. Ukita, T. Umeda WHOT-QCD Collaboration

Source: https://arxiv.org/







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