Speaker
Description
It is quite evident that in order to shed a light on Emergence of Hadron Mass phenomenon it is not enough to deeply study the proton structure but to know much more about pseudoscalar mesons and excited baryons and their properties. A lack on knowledge in this field is quite justified by the fact that it is much more difficult to study properties of unstable particles (i.e. mesons and excited baryons) than the ones of proton or neutron. Thanks to the unique high momentum (50 to 250 GeV/c) and high intensity (up to 2x10^8 /s) SPS/CERN secondary hadron beams AMBER will play a world leading role in this research by using pion/kaon and muon beams scattered off various targets. Drell-Yan pairs, J/Psi and Prompt Photon production processes together with hadron-electron scattering process will be used to access pseudoscalar meson and baryon structure.
Phase-1 of the AMBER physics program was approved in December 2020. At this stage of the experiment unique measurements of the proton-charge radius (or proton form-factor) and antiproton production cross-section in proton-He4/H2/D2 collisions will take place. A determination of the valence-quark PDF of the pion and kaon, through Drell-Yan and J/Psi di-muon production will follow as one of three Phase-1 approved measurements. A Phase-2 of the AMBER experiment is in preparation now and it will provide further precise knowledge on hadron structure and spectroscopy via Direct Photon production, high precision kaon-beam induced diffractive scattering and pion/kaon radii (form factors)
measurements.