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SUMMARY:EPOS.LHC-A: first results and impact on muon production in air sho
 wers
DTSTART;VALUE=DATE-TIME:20261030T161500Z
DTEND;VALUE=DATE-TIME:20261030T163000Z
DTSTAMP;VALUE=DATE-TIME:20261030T002923Z
UID:indico-contribution-6227@cern.ch
DESCRIPTION:Speakers: Roman Nikolaenko ()\nWith great amount of data comin
 g from collider and fixed-target experiments on all sorts of hadron collis
 ions\, and with very precise ultra-high energy cosmic ray (UHECR) measurem
 ents\, many missing pieces of crucial information on the nature of multipa
 rticle production in quantum chromodynamics (QCD) are now unraveled. The s
 implified assumptions of old models fail to allow constructing a flexible 
 description needed to satisfy the entire variety of data. The most evident
  example is the so-called "muon puzzle"\, the excess of $N_{\\mu}$ in UHEC
 R that remains a challenge to MC calculations even after almost two decade
 s of studies.\n\nEPOS is a state-of-the-art model that is being developed 
 in a paradigm of a "global approach"\, aiming to provide a universal way o
 f describing all types of hadronic interactions from $e^+e^-$ to heavy ion
  collisions\, with its EPOS.LHC-R version being adopted for cosmic ray stu
 dies.\n\nRecently\, a new string fragmentation model\, ATROPOS\, was inter
 faced with EPOS.LHC-R\, resulting in a new EPOS.LHC-A version. ATROPOS is 
 a unique approach that considers angular momentum conservation in the proc
 ess of string fragmentation. This allows to develop a sophisticated treatm
 ent of heavy resonances production\, along with changes in baryon producti
 on in hadron collisions. Moreover\, the strict treatment of space-time evo
 lution of string states is possible with ATROPOS\, which allows a precise 
 connection between string model parameters and the core-corona settings.\n
 \nIn this talk\, we report the latest developments of ATROPOS model and th
 e preliminary results of EPOS.LHC-A for hadron production and muon content
  in EAS.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6227/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6227/
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