BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Constraining CP Invariance in Ortho-Positronium Decays at 7 T with
  NeuroSphere MR-Compatible PET Modules
DTSTART;VALUE=DATE-TIME:20260911T091000Z
DTEND;VALUE=DATE-TIME:20260911T095000Z
DTSTAMP;VALUE=DATE-TIME:20260922T191403Z
UID:indico-contribution-2061@events.ncbj.gov.pl
DESCRIPTION:Speakers: Magdelena S. Allen (MGH Athinoula A. Martinos Center
  for Biomedical Imaging)\nPositron Emission Tomography (PET) systems can m
 easure the decay properties of ortho-positronium (oPs)\, an intermediate b
 ound state often formed during positron-electron annihilation that decays 
 to photons after a short lifetime. The lifetime and decay kinematics of oP
 s can be used to probe material properties\, have potential to serve as a 
 novel biomarker in disease\, and can be used test the Standard Model. Addi
 tional sources of charge conjugation-parity (CP) symmetry violation are re
 quired to explain the observed matter-antimatter imbalance in the Universe
 \, and CP violation can be constrained by measuring decays under the rever
 sal of an applied magnetic field. A dedicated physics measurement platform
  was constructed from the architecture of the NeuroSphere brain PET insert
  for 7-T MRI\, including a PET detector array\, positronium target with li
 fetime trigger\, and motorized gantry for control of the system orientatio
 n inside the 7-T environment. GATE simulations were used to inform the dev
 elopment of a custom data analysis pipeline for oPs event selection and mu
 lti-coincidence processing. Systematics were mitigated by combining runs w
 ith various target and detector positions (to average out artificial asymm
 etries caused by assembly or detector efficiency) and by applying a baseli
 ne correction from events in a kinematic region with vanishing analyzing p
 ower (to account for drift and complex field- and material-related effects
 ).  decays in polyvinyltoluene (PVT) were measured at 7 T\, finding a long
  lifetime component near 100 ns and CP violation consistent with zero. Thi
 s work demonstrates the unique opportunity provided by PET/MR instrumentat
 ion to perform high-field physics measurements and proof-of-concept for me
 asuring positronium decays with the full NeuroSphere system.\n\nhttps://ev
 ents.ncbj.gov.pl/event/468/contributions/2061/
LOCATION:
URL:https://events.ncbj.gov.pl/event/468/contributions/2061/
END:VEVENT
END:VCALENDAR