Effects of the charm quark on the QCD equation of state

Details Effects of the charm quark on the QCD equation of state Effects of the charm quark on the QCD equation of state

2009-10-15

arxiv.org/abs/0910.3006v1

PoS LAT2009:170,2009

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 7 figures, presented at Lattice 2009 (Nonzero Temperature and Density), Beijing, China

Scientific paper

We study the effects of the addition of the charm quark on the QCD equation of state at zero and nonzero chemical potential on lattices with $N_t=6$. Our ensembles are quenched with respect to charm and the charm quark is a valence staggered quark. Along the trajectory of constant physics the ratio $m_s/m_c$ is kept constant after tuning the charm quark mass at a lattice spacing of about 0.09 fm. We find that the charm quark has a significant contribution to the equation of state at zero chemical potential already at temperatures between about $1.2T_c$ and $2T_c$. The additional contribution at nonzero chemical potential vanishes within the current statistical uncertainty.

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