We present updated studies on the chiral phase transition in N f = 2 + 1 QCD. Simulations have been carried out using Highly Improved Staggered Quarks (HISQ) on lattices with temporal extent N τ = 6 at vanishing baryon chemical potential. We updated our previous study

We present updated studies on the chiral phase transition in N f = 2 + 1 QCD. Simulations have been carried out using Highly Improved Staggered Quarks (HISQ) on lattices with temporal extent N τ = 6 at vanishing baryon chemical potential. We updated our previous study [1] by extending the temperature window from (140 MeV, 150 MeV) to (140 MeV, 170 MeV). The strange quark mass was chosen to its physical value m phy s , and five values of two degenerate light quark masses are varied from m * Speaker. † The numerical simulations were carried out on clusters of the USQCD Collaboration in Jefferson Lab and Fermilab, TianHe I & II supercomputer centers in China and on the local computing cluster at Central China Normal University. The anthors are partly supported by the National Natural Science Foundation of China under grant numbers 11535012 and 11521064.