One aim for the new electron accelerator MESA is to measure the weak mixing angle in electron-proton scattering with high precision. This results in a requirement for beam polarization measurement of ∆P/P≈0.5%. The Møller polarimeter proposed in 2004 opens the way to reach a sufficiently accurate measurement. The polarized atomic hydrogen target is under construction. The current status...
We performed searches for axion-like particles (ALPs) at SPring-8, one of the largest synchrotron radiation facility in the world. The searches are based on the light-shining-through-a-wall technique, and two different electromagnetic field sources, high-repetition pulsed magnets and atomic electric fields in a single crystal, are used for the photon-ALP conversion. The detail of the searches...
In Japan, there are some facilities where GeV-class photon beam is available. In SPring-8, LEPS/LEPS2 experiment is on-going. LEPS2 experiment is aiming to open a new field of physics by using a highly polarized photon beam from backward Compton scattering. In ELPH, FOREST experiment composed of calorimeters and a forward spectrometer is on-going.
The property and status of each facility is...
Precision measurements of several η(′) decay channels, with emphasis on rare neutral modes, will be carried out at the Jefferson Lab Eta Factory (JEF). This experiment will employ the baseline GlueX detector at Hall D/Jefferson Lab, augmented by upgrading the central region of the electromagnetic, Forward CALorimeter (FCAL-II) and is scheduled to run in 2023-4. Copious numbers of...
The A2 tagged photon facility at the Mainz Microtron (MAMI) allows for high-precision photo-nuclear studies. The Bremsstrahlung distribution of the A2 photon beam, produced from the MAMI electron beam, covers an E_gamma range between 40 and 1604 MeV. This beam of real photons serves as a clean electromagnetic probe allowing for detailed studies of the inner properties of the nucleon as well as...
