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Forward-backward (FB) multiplicity correlations among produced particles across azimuth and pseudorapidity have been studied for pp collisions at LHC energies within the PYTHIA8 framework. The analysis reveals that azimuthal sectors with \(\varphi _\textrm{sep} > \pi /4\) are primarily influenced by long-range correlations (LRCs), whereas regions with \(\varphi _\textrm{sep} \le \pi /4\) are driven by short-range correlations (SRCs). Initial-state radiation (ISR) exhibits a stronger influence on the FB correlation strength, \(b_\textrm{corr}(mult.)\) , compared to final-state radiation (FSR). Notably, the QCD color rope model and tuned MPI-based CR scenarios achieve quantitative agreement with the ALICE data across all energies. However, the MPI-based CR with the default CR range of 1.8 fails to match the data at the studied energies. These results underscore the critical roles of ISR, FSR, and hadronization mechanisms play in shaping correlations, offering valuable insights into the underlying dynamics of high-energy pp collisions.

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Unveiling the Role of Color Reconnection and QCD Radiation in Forward-Backward Multiplicity Correlations in pp Collisions at LHC Energies

  • 会议论文

  • 发表日期：

    2025年

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  • Rohit Agarwala,
  • Kalyan Dey

摘要

Forward-backward (FB) multiplicity correlations among produced particles across azimuth and pseudorapidity have been studied for pp collisions at LHC energies within the PYTHIA8 framework. The analysis reveals that azimuthal sectors with \(\varphi _\textrm{sep} > \pi /4\) are primarily influenced by long-range correlations (LRCs), whereas regions with \(\varphi _\textrm{sep} \le \pi /4\) are driven by short-range correlations (SRCs). Initial-state radiation (ISR) exhibits a stronger influence on the FB correlation strength, \(b_\textrm{corr}(mult.)\) , compared to final-state radiation (FSR). Notably, the QCD color rope model and tuned MPI-based CR scenarios achieve quantitative agreement with the ALICE data across all energies. However, the MPI-based CR with the default CR range of 1.8 fails to match the data at the studied energies. These results underscore the critical roles of ISR, FSR, and hadronization mechanisms play in shaping correlations, offering valuable insights into the underlying dynamics of high-energy pp collisions.