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SUMMARY:Data processing and event selection for measuring polarization cor
 relations of annihilation photons at large Compton scattering angles
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261101T183707Z
UID:indico-contribution-6495@cern.ch
DESCRIPTION:Speakers: Mikhail Evsiukov (INR RAS)\nWe describe the experime
 ntal setup and data analysis procedure developed for measuring polarizatio
 n correlations of 511 keV annihilation photons after Compton scattering at
  angles from 60° to 120°. The setup consists of two arms of Compton pola
 rimeters with intermediate pre-scatterers placed in front of the main scat
 terers. Each arm is equipped with a ring of 16 scintillation counters cove
 ring the full azimuthal range. The upgrade of the setup for large-angle me
 asurements and the corresponding changes in the data acquisition are discu
 ssed. The data processing pipeline includes energy calibration of all dete
 ctors with temperature drift correction\, time-based selection of coincide
 nce events\, identification of pre-scattering interactions in the intermed
 iate scatterer\, and reconstruction of the scattering angle from the measu
 red energy deposit. The classification of events into bins by scattering a
 ngle and the extraction of the visibility parameter from azimuthal angular
  distributions are described in detail. The entire procedure is validated 
 against Monte Carlo simulations performed with the Geant4 toolkit. The res
 ulting data set provides the input for the physics analysis of entanglemen
 t evolution during Compton scattering.\n\nhttps://indico.particle.mephi.ru
 /event/626/contributions/6495/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6495/
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