Nuclear Physics & RIKEN Theory Seminar
"Hadron electric polarizability from lattice QCD"
Presented by Andrei Alexandru, The George Washington University
Friday, May 24, 2013, 2 pm
Small Seminar Room, Bldg. 510
Hosted by: Vladimir Skokov
Electric polarizability measures the ability of the electric field to deform a particle. Experimentally, the electric and magnetic polarizabilities can be measured in Compton scattering experiments. To compute these quantities theoretically we need to understand the internal structure of the scatterer. For hadrons — bound stated of quarks and gluons — this is a very difficult problem since their internal structure cannot be parametrized easily. While quantum chromodynamics describes accurately the interactions between quarks and gluons, direct computations of hadron properties in terms of the quark degrees of freedom are very challenging. In this talk I will show how to use lattice QCD to extract the electric polarizability of hadrons, outlining both the theoretical and computational challenges we must overcome to arrive at the final answer.