Analysis of Pb+Pb data for net-charge fluctuations at LHC energies using the HYDJET++model is presented.The strongly intensive quantities D and Σ were used to remove the effects related to system volume fluctuations....Analysis of Pb+Pb data for net-charge fluctuations at LHC energies using the HYDJET++model is presented.The strongly intensive quantities D and Σ were used to remove the effects related to system volume fluctuations.We employed two versions of HYDJET++for the analysis.The first one is the standard or default version,whereas the second one is a modification that takes into account explicit event-by-event conservation of the electric net-charge of produced particles.The inclusion of the canonical net-charge conservation in the model allows for better description of the experimental data obtained by the ALICE and CMS Collaborations.A comparison with calculations from other models is also presented.展开更多
Data from the Large Hadron Collider on the charge balance function in Pb+Pb collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed and interpreted within the framework of the HYDJET++model.This mod...Data from the Large Hadron Collider on the charge balance function in Pb+Pb collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed and interpreted within the framework of the HYDJET++model.This model allows us to qualitatively reproduce the experimentally observed centrality dependence of the balance function widths at relatively low transverse momentum intervals due to the different charge creation mechanisms in soft and hard processes.However,a fully adequate description of the balance function in these intervals implies an essential modification of the model by including exact charge conservation via the canonical rather than the grand canonical ensemble.A procedure is proposed for introducing charge correlations into the thermal model without changing other model parameters.With increasing transverse momenta,the default model results describe the exper-imental data much better because the contribution of the soft component of the model is significantly reduced in these transverse momentum intervals.In practical terms,there is a transition to a single source of charge correlations,namely,charge correlations in jets in which exact charge conservation holds at each stage.展开更多
文摘Analysis of Pb+Pb data for net-charge fluctuations at LHC energies using the HYDJET++model is presented.The strongly intensive quantities D and Σ were used to remove the effects related to system volume fluctuations.We employed two versions of HYDJET++for the analysis.The first one is the standard or default version,whereas the second one is a modification that takes into account explicit event-by-event conservation of the electric net-charge of produced particles.The inclusion of the canonical net-charge conservation in the model allows for better description of the experimental data obtained by the ALICE and CMS Collaborations.A comparison with calculations from other models is also presented.
文摘Data from the Large Hadron Collider on the charge balance function in Pb+Pb collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed and interpreted within the framework of the HYDJET++model.This model allows us to qualitatively reproduce the experimentally observed centrality dependence of the balance function widths at relatively low transverse momentum intervals due to the different charge creation mechanisms in soft and hard processes.However,a fully adequate description of the balance function in these intervals implies an essential modification of the model by including exact charge conservation via the canonical rather than the grand canonical ensemble.A procedure is proposed for introducing charge correlations into the thermal model without changing other model parameters.With increasing transverse momenta,the default model results describe the exper-imental data much better because the contribution of the soft component of the model is significantly reduced in these transverse momentum intervals.In practical terms,there is a transition to a single source of charge correlations,namely,charge correlations in jets in which exact charge conservation holds at each stage.
