2020/06/01 by A. Gajos, Gajos, Aleksander
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det) #Muon and positron interactions and applications #Neutrino Physics Research #Radiation Detection and Scintillator Technologies
paper · pdf · doi:10.48550/arxiv.2006.01012
openalex publication_date 2020/06/01 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
Study of certain angular correlations in the three-photon annihilations of\nthe triplet state of positronium, the electron-positron bound state, may be\nused as a probe of potential CP and CPT-violating effects in the leptonic\nsector. We present the perspectives of CP and CPT tests using this process\nrecorded with a novel detection system for photons in the positron annihilation\nenergy range, the Jagiellonian PET (J-PET). We demonstrate the capability of\nthis system to register three-photon annihilations with an unprecedented range\nof kinematical configurations and to measure the CPT-odd correlation between\npositronium spin and annihilation plane orientation with a precision improved\nby at least an order of magnitude with respect to present results. We also\ndiscuss the the means to control and reduce detector asymmetries in order to\nallow J-PET to set the first measurement of the correlation between positronium\nspin and momentum of the most energetic annihilation photon which has never\nbeen studied to date.\n