Sharareh Jalali
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Sharareh Jalali has a total of 68 co-authors. Here are the top co-authors by number of shared publications:
- Aleksander Khreptak
Jagiellonian University
2 shared publications - Bartlomiej Rachwal
AGH — University of Krakow, Faculty of Physics and Applied Computer Science
2 shared publications - Catalina Curceanu
Laboratori Nazionali di Frascati, INFN, Frascati, Italy
2 shared publications - Edward Lisowski
Cracow University of Technology
2 shared publications - Eryk Czerwinski
Jagiellonian University
2 shared publications - Ewa Stępień
Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Kraków, Poland
2 shared publications
Latest Publications
- Open Access
- 4 February 2026
- Published by American Physical Society (APS) in Physical Review D
- Vol. 113 (3)
Studies of C P T symmetry in positronium decays with the 192 plastic strip J-PET detector
A direct test of the C P T symmetry is performed for the electromagnetic decays of ortho-positronium using the Jagiellonian positron emission tomograph (J-PET). We present the precise measurement of the C P T -sensitive angular correlation entailing the positronium spin and the momenta of its annihilation photons, surpassing previous studies utilizing the same detection system. Positrons originating from a Na 22 source are emitted from the detector’s center and subsequently form positronium atoms within the spherical chamber covered with porous material. Reconstruction of annihilation locations using the 192-strip J-PET detector makes it possible to determine the positronium emission direction, which defines the quantization axis along which positronium is polarized, without the application of external magnetic fields. The measurements were performed in total for 356 days resulting in an identification of 47.8 × 10 6 events with ortho-positronium decays into three photons. The results are consistent with the exactness of C P T symmetry with measured asymmetry amplitude − 0.00029 ± 0.00022 (stat.) and with statistical error four times smaller than the previous best measurement.
- 4 February 2026
- Published by American Physical Society (APS) in Physical Review D
- Vol. 113 (3)
Open AccessStudies of C P T symmetry in positronium decays with the 192 plastic strip J-PET detector
A direct test of the C P T symmetry is performed for the electromagnetic decays of ortho-positronium using the Jagiellonian positron emission tomograph (J-PET). We present the precise measurement of the C P T -sensitive angular correlation entailing the positronium spin and the momenta of its annihilation photons, surpassing previous studies utilizing the same detection system. Positrons originating from a Na 22 source are emitted from the detector’s center and subsequently form positronium atoms within the spherical chamber covered with porous material. Reconstruction of annihilation locations using the 192-strip J-PET detector makes it possible to determine the positronium emission direction, which defines the quantization axis along which positronium is polarized, without the application of external magnetic fields. The measurements were performed in total for 356 days resulting in an identification of 47.8 × 10 6 events with ortho-positronium decays into three photons. The results are consistent with the exactness of C P T symmetry with measured asymmetry amplitude − 0.00029 ± 0.00022 (stat.) and with statistical error four times smaller than the previous best measurement.
- Open Access
μPPET: Investigating the Muon Puzzle with J-PET Detectors
The PPET [mu()on Probe with J-PET] project aims to investigate the “Muon Puzzle” seen in cosmic ray air showers. This puzzle arises from the observation of a significantly larger number of muons on Earth’s surface than that predicted by the current theoretical models. The investigated hypothesis is based on recently observed asymmetries in the parameters for the strong interaction cross-section and trajectory of an outgoing particle due to projectile–target polarization. The measurements require detailed information about muons at the ground level, including their track and charge distributions. To achieve this, the two PET scanners developed at the Jagiellonian University in Krakow (Poland), the J-PET detectors, will be employed, taking advantage of their well-known resolution and convenient location for detecting muons that reach long depths in the atmosphere. One station will be used as a muon tracker, while the second will reconstruct the core of the air shower. In parallel, the existing hadronic interaction models will be modified and fine-tuned based on the experimental results. In this work, we present the conceptualization and preliminary designs of PPET.Open AccessμPPET: Investigating the Muon Puzzle with J-PET Detectors
The PPET [mu()on Probe with J-PET] project aims to investigate the “Muon Puzzle” seen in cosmic ray air showers. This puzzle arises from the observation of a significantly larger number of muons on Earth’s surface than that predicted by the current theoretical models. The investigated hypothesis is based on recently observed asymmetries in the parameters for the strong interaction cross-section and trajectory of an outgoing particle due to projectile–target polarization. The measurements require detailed information about muons at the ground level, including their track and charge distributions. To achieve this, the two PET scanners developed at the Jagiellonian University in Krakow (Poland), the J-PET detectors, will be employed, taking advantage of their well-known resolution and convenient location for detecting muons that reach long depths in the atmosphere. One station will be used as a muon tracker, while the second will reconstruct the core of the air shower. In parallel, the existing hadronic interaction models will be modified and fine-tuned based on the experimental results. In this work, we present the conceptualization and preliminary designs of PPET.