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SUMMARY:ACTS-based reconstruction for a straw-tube forward tracker in MPD
DTSTART;VALUE=DATE-TIME:20261030T064500Z
DTEND;VALUE=DATE-TIME:20261030T070000Z
DTSTAMP;VALUE=DATE-TIME:20261104T112533Z
UID:indico-contribution-6371@cern.ch
DESCRIPTION:Speakers: Nazar Burmasov (NRC «Kurchatov Institute» - PNPI)\
 nA straw-tube forward tracking detector is being considered for the second
  stage of the Multi-Purpose Detector (MPD) at the NICA collider. It would 
 extend the MPD acceptance to forward rapidities and broaden the accessible
  physics program. In central heavy-ion collisions\, high hit density and g
 host hits create a large combinatorial background\, making robust track re
 construction challenging. We present recent developments of the ACTS-based
  reconstruction aimed at improving its performance in this environment.\n\
 nRecent work focused on two stages that were found to limit the reconstruc
 tion performance: space-point creation and track seeding. The space-point 
 algorithm combines measurements from stereo-crossed straw layers. Its ambi
 guity resolution was studied using a graph neural network\, and the determ
 inistic selection was subsequently optimized to improve the balance betwee
 n reconstruction efficiency and background suppression. In parallel\, a cu
 stom seeding algorithm was developed to exploit space points from all five
  tracking stations\, instead of the three fixed stations used in the previ
 ous ACTS-based setup. This makes seed reconstruction less sensitive to mis
 sing or ambiguous space points in individual stations.\n\nWith these impro
 vements\, high reconstruction efficiency for trackable primary pions is ac
 hieved in central Au-Au events at $\\sqrt{s_{\\rm{NN}}}=11$ GeV simulated 
 with UrQMD\, while maintaining high reconstructed-track purity. Further de
 velopments will include matching with the forward TOF detector to study it
 s potential for additional ghost suppression.\n\nhttps://indico.particle.m
 ephi.ru/event/626/contributions/6371/
LOCATION: Conference Hall 5
URL:https://indico.particle.mephi.ru/event/626/contributions/6371/
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