- Este evento ha pasado.
septiembre 12, 2018 @ 2:30 pm - 4:00 pm
Nombre: Murray Moinester
Institución:Tel Aviv University
Lugar: Seminario de Física Teórica II (2ª planta)
Hora:14:30 miércoles 12 de Septiembre
Título:”Hadron Structure studied at CERN COMPASS via Pion-Photon scattering”
Abstract: CERN COMPASS investigates pion-photon interactions to achieve a unique Primakoff physics program. The experiment scatters 200 GeV beams (π, K, p) from virtual photons in the Coulomb field of a target nucleus, and uses magnetic spectrometers and calorimeters to measure the complete kinematics of hadron-photon reactions. Thereby, pion polarizabilities, hybrid mesons, the chiral anomaly, and meson radiative transitions are studied. For example, the pion polarizabilities and radiative transitions are measured via the dedicated Primakoff effect reactions πγ → πγ and πγ → Meson*. Although this COMPASS program will be described generally, the pion polarizability measurement will be emphasized. Pion polarizabilities are directly linked to the quark-gluon substructure and dynamics of the pion. The electric απ and magnetic βπ charged pion polarizabilities characterize the induced dipole moments (stiffness) of the pion during γπ scattering. They provide stringent tests of various theoretical models, for example chiral perturbation theory. A pion polarizability status report will presented.