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Revealing a deep connection between factorization and saturation: New insight into modeling high-energy proton-proton and nucleus-nucleus scattering in the EPOS4 framework

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  • معلومة اضافية
    • Contributors:
      Laboratoire de physique subatomique et des technologies associées (SUBATECH); Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique); Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST); Nantes Université - pôle Sciences et technologie; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)
    • بيانات النشر:
      Preprint
    • بيانات النشر:
      American Physical Society (APS), 2023.
    • الموضوع:
      2023
    • نبذة مختصرة :
      It is known that multiple partonic scatterings in high-energy proton-proton ($pp$) collisions must happen in parallel. However, a rigorous parallel scattering formalism, taking energy sharing properly into account, fails to reproduce factorization, which on the other hand is the basis of almost all $pp$ event generators. In addition, binary scaling in nuclear scatterings is badly violated. These problems are usually ``solved'' by simply not considering strictly parallel scatterings, which is not a solution. I will report on new ideas (leading to EPOS4), which allow recovering perfectly factorization, and also binary scaling in $AA$ collisions, in a rigorous unbiased parallel scattering formalism. In this new approach, dynamical saturation scales play a crucial role, and this seems to be the missing piece needed to reconcile parallel scattering with factorization. From a practical point of view, one can compute within the EPOS4 framework parton distribution functions (EPOS PDFs) and use them to compute inclusive $pp$ cross sections. So, for the first time, one may compute inclusive jet production (for heavy or light flavors) at very high transverse momentum ($p_{t}$) and at the same time in the same formalism study flow effects at low $p_{t}$ in high-multiplicity $pp$ events, making EPOS4 a full-scale ``general purpose event generator''. I discuss applications, essentially multiplicity dependencies (of particle ratios, mean $p_{t}$, charm production) which are very strongly affected by the saturation issues discussed in this paper.
      24 pages, 37 figures
    • ISSN:
      2469-9993
      2469-9985
    • الرقم المعرف:
      10.1103/physrevc.108.064903
    • الرقم المعرف:
      10.48550/arxiv.2301.12517
    • Rights:
      CC BY
    • الرقم المعرف:
      edsair.doi.dedup.....bb5a1553685112878307dbd3db8d2c26