Conveners
Parallel session A7: Light Mesons and Baryons 6
- Wolfgang Schafer (Institute of Nuclear Physics PAS)
Light-by-Light scattering involves the interaction of two strong electromagnetic fields, resulting in the emission of two photons. The phenomenon was first observed experimentally in 2017 [1][2], using photon measurements in ultraperipheral lead-lead collisions (UPC). Applying the Equivalent Photon Approximation model gives results which describe differential and total cross sections presented...
Metastable pionic helium is a three-body exotic atom composed of a helium nucleus, electron, and negatively-charged pion occupying a highly-excited state with a principal and orbital angular momentum quantum numbers of n≈l-1≈17 [1-4]. The atom has a τ=7 ns lifetime. We used the 590 MeV ring cyclotron facility of PSI to synthesize π4He+ and irradiate the atoms with 800 ps-long resonant laser...
The anomalous magnetic moment of muon has been a long standing issue in the field of particle physics. The recent results by Fermilab have pointed to a possible discrepancy of 4.2 sigma with respect to the Standard Model prediction.
Although the future measurements will undoubtedly strengthen this result, the large uncertainty of the prediction, caused by its non-perturbative contributions,...
The J-PET is a high-acceptance multi-purpose detector optimized for the detection of photons from positron-electron annihilation and can be used in a broad scope of interdisciplinary investigation. The Positronium system, a bound state of an electron and a positron, is suitable for testing the predictions of quantum electrodynamics (QED). In particular, the Ps triple state, the...
