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We study the multiplicity fluctuation and correlation of identified mesonsand baryons formed at the hadronization by the quark combination mechanism inthe context of ultra-relativistic heavy-ion collisions. Based on thestatistical method of free quark combination, we derive the two-hadronmultiplicity correlations such as meson-meson and meson-baryon correlations,and take the effects of quark number fluctuation at hadronization into accountby a Taylor expansion method. After including the decay contributions, wecalculate the dynamical fluctuation observable $\nu_{dyn}$ for $\text{K}\pi$,$p\pi$ and $\text{K}p$ pairs and discuss what underlying physics can beobtained by comparing with the data in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$TeV and the simulations from HIJING and AMPT event generators.

Multiplicity fluctuation and correlation of mesons and baryons in ultra-relativistic heavy-ion collisions at LHC