Abstract
We present a systematic study on the strange particle production at the Large Hadron Collider (LHC) in proton-proton (pp) collisions at $\sqrt{s}=$ 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, it is turned out that the inclusion of variable effective string tension is capable to reach an improved agreement between theory and experiment, especially on 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.
Highlights
The production of strange hadrons plays an important role in investigations of properties of the strong force and deconfined quark-gluon matter
We present a systematic study of th√e strange particle production at the CERN Large Hadron Collider (LHC) in proton-proton collisions at s = 7 TeV based on PACIAE simulations
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
Summary
The production of strange hadrons plays an important role in investigations of properties of the strong force and deconfined quark-gluon matter. The EPOS model [14] assumes the QGP matter is partly formed in pp collisions, treating the interactions based on a core-corona approach The prediction of this model agrees qualitatively with the observed increasing trend of the strangeness production [15]. We introduce an effective string tension stemming from the single string structure variation and the multiple string interaction effect to reduce the strange quark suppression in pp collisions based on the tunneling probability in the Lund string fragmentation model These two mechanisms of obtaining the effective string tensions are implemented in the PACIAE Monte Carlo even√t generator [21] to study the strange hadron production in s = 7 TeV pp collisions at the LHC.
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