"The Israeli Joint Nuclear Physics Seminars: Measurement of the charged-pion polarizability at CERN COMPASS"

Date: 
Mon, 23/11/201515:00-15:55
Location: 
Shenkar Building, Holcblat Hall 007 (1st floor the corridor between the Physics and Chemistry Buildings), Tel Aviv University
Lecturer: Prof. Murray Moinester Affiliation: Tel Aviv University Abstract: The pion polarizability is of fundamental interest in the low-energy sector of quantum chromodynamics. It is directly linked to the quark-gluon substructure and dynamics of the pion, the lightest bound system of the strong interaction. For more than a decade, COMPASS has been tackling the measurement of the electromagnetic polarizability of the charged pion, which describes the stiffness of the pion against deformation in electromagnetic fields. Previous experiments date back to the 1980's in Serpheukhov (Russia), where the Primakoff method for realizing interactions of charged pions with quasi-real photons was first employed. Later, other measurements based on photon-nucleon and photon-photon collisions were also carried out at different laboratories. The COMPASS measurement demonstrates that the charged-pion polarizability is significantly smaller than the previous results, roughly by a factor two, with the smallest uncertainties realized so far. Additional details of the upcoming Israeli Joint Nuclear Physics' Seminars can be found on the following link. ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts. הצטרף: https://hangouts.google.com/hangouts/_/mail.huji.ac.il/the-israeli?hceid...