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In quenched QCD the Polyakov loop is an order parameter of the deconfinementtransition, but with decreasing quark mass, the peak in the Polyakov loopsusceptibility becomes less pronounced, and it loses its interpretation as anindicator for deconfinement. For this $N_f=2+1$ HISQ study, we fix the strangequark mass $m_s$ at its physical value and investigate the dependence of thePolyakov loop on the light quark mass $m_l$ in the range $m_s/m_l=27-160$,following $m_l$ toward the chiral limit. In particular we will look how theinflection point and susceptibility behave as we decrease $m_l$, to see whetherone finds any indication of a crossover, and therefore whether the Polyakovloop is sensitive to the chiral phase transition. Preliminary results show nosignal of a crossover from the real part of the Polyakov loop in the vicinityof the chiral crossover. Closely related is an investigation of Polyakov loopcorrelations and the Debye mass in this limit. Preliminary results suggestlittle or no dependence on $m_l$.

Polyakov Loop Susceptibility and Correlators in the Chiral Limit