Impact of single string structure and multiple string interaction on strangeness production in Pb+Pb collisions at sNN=2.76 TeV

We present a systematic study of the strange and multistrange particle production in Pb $+$ Pb collisions at $\sqrt{{s}_{NN}}=2.76$ TeV based on paciae model simulations. Two different mechanisms, namely the single string structure variations and multiple string interactions, are implemented in the simulations. These modifications give rise to an enhancement of the string tension value involved in the Lund string fragmentation framework and generate more strange particles in the hadronic final state. By comparing the simulation results with the ALICE experimental data, it turns out that the inclusion of the variable effective string tension in the paciae model results in an improved agreement between theory and experiment on the strangeness production in Pb $+$ Pb collisions.