Classical Tunes of Quantum Field Theory

par Yuri Dokshitzer (LPTHE)

mardi 1 déc. 2015, 16:30 → 17:30 Europe/Paris

Amphithéâtre Charpak (LPNHE)

Relativistic dynamics of quantum fields (Quantum Field Theory) looks intrinsically complicated. And so it is indeed. However, now and then QFT permits, all of a sudden, to use a simple classical language in order to describe certain important observables. This is markedly the case of momentum distributions of quarks and gluons inside a proton --- parton distribution functions, --- a key instrument of LHC searches for new physics. 

  We will discuss how and why this happens, expose hidden beauty of QCD parton dynamics and glance at bright manifestations of quantum coherence in multiparticle production ("QCD radiophysics"). 

A deeper insight into the nature of "classicality" based on resurrection of well forgotten 60-years-old ideas may result in full analytic solvability of a supersymmetric QFT (N=4 SUSY) --- a close relative of Quantum ChromoDynamics.