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SUMMARY:Reconstruction Procedure for ΛΛ Pairs in Xe + CsI Collisions at 
 3.8A GeV in the BM@N Experiment
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261026T050611Z
UID:indico-contribution-6400@cern.ch
DESCRIPTION:Speakers: Ksenia Alishina (JINR VB LHEP)\n**Abstract**\n\nSubt
 hreshold production of ΛΛ pairs in nucleus–nucleus collisions is large
 ly unexplored and is of particular interest for studying strangeness-produ
 ction mechanisms in dense baryonic matter.\n\nIn 2023\, the fixed-target B
 M@N experiment at the NICA–Nuclotron accelerator complex collected data 
 from Xe + CsI collisions at a beam kinetic energy of 3.8A GeV. This work p
 resents the procedure used to reconstruct Λ hyperons and extract the ΛΛ
  signal from these data.\n\nΛ hyperons are reconstructed via the weak dec
 ay Λ → pπ⁻ using a displaced-vertex topology\, with the secondary de
 cay vertex separated from the primary interaction vertex. Events containin
 g two Λ candidates are analysed using the two-dimensional distribution of
  the invariant masses of the two pπ⁻ combinations. The number of events
  containing ΛΛ pairs is determined by estimating the contribution from c
 ombinatorial background in the two-dimensional invariant-mass plane. The s
 tability of the extracted ΛΛ signal is assessed by varying the Λ-candid
 ate selection criteria and the methods used to model the combinatorial bac
 kground.\n\nhttps://indico.particle.mephi.ru/event/626/contributions/6400/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6400/
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