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SUMMARY:Non-identical particle femtoscopy as a probe of the heavy-ion coll
 ision dynamics
DTSTART;VALUE=DATE-TIME:20260923T095000Z
DTEND;VALUE=DATE-TIME:20260923T101000Z
DTSTAMP;VALUE=DATE-TIME:20260914T013556Z
UID:indico-contribution-542@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Volodymyr Shapoval (Bogolyubov Institute for Theoret
 ical Physics)\nThe momentum correlations in pairs of non-identical particl
 es produced in heavy-ion collisions can be used to determine the space-tim
 e asymmetries in the radiation of the two particle species [1]. And these 
 asymmetries\, in turn\, reflect the peculiarities of the underlying collis
 ion dynamics.\n\nSince the system created in a relativistic heavy-ion coll
 ision undergoes collective expansion\, one of the explanations for the dif
 ference in average position and time of emission for different hadron spec
 ies could be the different shift by the transverse collective flow. The ot
 her possible reasons include the different particle interaction cross sect
 ions\, production via long-lived resonance decays\, re-scattering at the h
 adronic stage of the collision\, etc. [2]. However\, in the experiment one
  can hardly separate one factor from another to trace their respective rol
 es in gaining the observed result. That is why to analyze the situation in
  detail one should rather consider the simulation of the collision in real
 istic models\, where one can fully control the process.\n\nIn this work\, 
 we analyzed correlations in pion-kaon pairs based on the simulations of le
 ad-lead collisions at the Large Hadron Collider in the well-known iHKM [3]
  and LQTH [4] models. The results were compared to the experimental data f
 rom the ALICE Collaboration [2]. The analysis was carried out at different
  average pair transverse velocities. The sizes of the particle emission so
 urces and the displacements between the pion and kaon source centers were 
 determined. It was found that the crucial factor affecting the emission as
 ymmetry between pions and kaons are hadronic re-scatterings at the late ``
 afterburner'' stage of the system's evolution. The presence of a hadron ca
 scade stage simulation in the iHKM model allows it to provide a much bette
 r description of the data as compared to the LQTH model\, which lacks the 
 corresponding stage.\n\n[1] R. Lednicky\, V. L. Lyuboshits\, B. Erazmus\, 
 D. Nouais\,\nPhys. Lett. B **373**\, 30 (1996)\; A. Kisiel\, Phys. Rev. C 
 **81**\, 064906 (2010).\n[2] S. Acharya\, *et al.* (ALICE collaboration)\,
  Phys. Lett. B **813**\, 136030 (2021).\n[3] V. Yu. Naboka\, Iu. A. Karpen
 ko\, Yu. M. Sinyukov\, Phys. Rev. C **93**\, 024902 (2016).\n[4] P. Bozek 
 and I. Wyskiel-Piekarska\, Phys. Rev. C **85**\, 064915 (2012).\n\nhttps:/
 /indico.bitp.kiev.ua/event/18/contributions/542/
LOCATION:Bogolyubov Institute for Theoretical Physics Conference Hall
URL:https://indico.bitp.kiev.ua/event/18/contributions/542/
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