Abstract
Multiparticle correlations is a hallmark measurement characterizing the behaviour of the assumed Quark Gluon Plasma in heavy ion collisions. In these proceedings an alternative, microscopic approach is presented, based on interacting strings and multiparton interactions.
Highlights
The correct description of forward production, as shown in figure 1 is crucial, as it allows for comparison to data in bins of centrality defined in the same way as done in experiment – in particular for pA collisions, the translation from geometric to measured centrality is not straightforward. This task is further eased by the RIVET framework for data comparison [10], which has recently been updated to include heavy ion functionality [11], centrality included
As mentioned in the previous section, the particle content of the final state, is governed by strings responsible for the partonic final state fragmenting to hadrons
Assuming that only the electric field contributes to the string energy density, the potential energy of a two-string configuration with a separation d⊥, can be calculated
Summary
In high energy collisions of protons, the presence of multiparton interactions (MPIs) are ubiquitous, and to a large extent successfully modelled by considering individual interactions as almost independent perturbative scatterings This model was introduced to the PYTHIA event generator [1] by Sjöstrand and van Zijl [2], and takes as a starting point the 2 → 2 scattering cross section, with its low p⊥ divergence regularised using a parameter p⊥0: dσ2→2 d p2⊥. The resolution was to colour-reconnect soft partonic scatterings to hard ones, with the guiding principle of minimizing the total potential energy in the string Such a treatment can correctly reproduce p⊥ (Nch), and it was later shown to give effects similar to collectivity [3], reproduced in later, more elaborate models [4]. This task is further eased by the RIVET framework for data comparison [10] (with which the above figures are produced), which has recently been updated to include heavy ion functionality [11], centrality included
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