Scattering of photons on A0-background in a quark-gluon plasma
Seminars
Joint seminar “Theory of Fundamental Interactions” and “Theory of Hadronic Matter under Extreme Conditions”
Date and Time: Thursday, 21 February 2019, at 4:00 PM
Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics
Seminar topic: “Scattering of photons on A0-background in a quark-gluon plasma”
Speaker: M. Bordag (Universität Leipzig, Germany)
Abstract:
In heavy ion collisions a quark-gluon plasma is supposed to be created whose temperature is in the deconfinement region allowing for a quasiparticle description. Within this description condensate fields may exist. We focus on a spontaneously generated A0-background, which is equivalent to an imaginary chemical potential. The corresponding symmetry breaking invalidates the Furry theorem and allows for non-vanishing tadpole and triangle diagrams. First we consider a tadpole diagram (closed quark line). It can be easily re-summed and results in a redefinition of A0. Next, we consider a triangle diagram with two external photon lines and a quark current in the third vertex. We discuss the resulting scattering of photons.