Within a 2+1 flavor Nambu Jona-Lasinio model, we calculate the curvature coefficients and check them against available lattice QCD estimations. With the observation that the flavor mixing due to the `t Hooft determinant term significantly affects the κ₂S, we explore the effect of μS on the T-μB crossover lines. With the novel determination of negative κ₂B at large μS, we advocate the importance of studying the same in lattice QCD.
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Ali et al. (2024) studied this question.
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