Effect of single string structure and multiple string interaction on strange particle production in pp collisions at root s=7 TeV

摘要

We present a systematic study of the strange particle production at the CERN Large Hadron Collider (LHC) in proton-proton (pp) collisions at root s = 7 TeV based on PACIAE simulations. Two different mechanisms accounting for single string structure variations and multiple string interactions are implemented in the simulations. These modifications give rise to increased effective string tension in the Lund fragmentation model and generate more strange particles in the hadronic final state. By comparing the results with a wealth of the LHC data, we find that the inclusion of variable effective string tension yields an improved agreement between theory and experiment, especially for the recently observed multiplicity dependence of strangeness enhancement in pp collisions. This approach provides us a new method to understand the microscopic picture of the novel high multiplicity pp events collected at the LHC in the string fragmentation framework.