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Estimated using the unbiased exponential resummation formalism on(2+1)-flavor QCD with physical quark masses on $\Nt=8$ lattice, we present thefirst calculations of Lee-Yang zeros of QCD partition function in complexisospin chemical potential $\muI$ plane. From these zeros, we obtain theresummed estimate of radius of convergence, which we compare with thecorresponding ratio and Mercer-Roberts estimates of the subsequent Taylorseries expansions of the first three cumulants. We also illustrate acomparative study between the resummed and the Taylor series results ofdifferent partition function cumulants for real and imaginary values of $\muI$,discussing the behaviour of different expansion orders within and beyond theso-obtained resummed estimate of radius of convergence. We show that thereweighting factor and phasefactor begin to attain zero from this resummedestimate of radius of convergence. In this paper, we crosscheck thisresummation methodology in baryochemical potential $\muB$ and affirm itsvalidity in finite statistics limit. We also briefly compare this method withTaylor and \pade resummation results in $\muB$. We also re-establish thisresummed radius of convergence can capture the onset of overlap problem forfinite real $\muI$ simulations.

Estimates of Lee-Yang zeros and critical point for finite isospin densities in (2+1)-flavor lattice QCD using unbiased exponential resummation