QCD environment with chiral imbalance and exotic meson decays

by Prof. Alexander Andrianov (Sankt Petersburg State University)

Thursday 28 Sept 2017, 15:00 → 16:00 Europe/Rome

An emergence of Local Parity Breaking (LPB) in central heavy-ion collisions (HIC) at high energies is discussed. LPB in the fireball can be produced by a difference between the number densities of right- and left-handed chiral fermions (Chiral Imbalance) which is implemented by a chiral (axial) chemical potential. The effective meson lagrangian induced by QCD is extended to the medium with Chiral Imbalance and the properties of light scalar and pseudoscalar mesons (a0,π) are analyzed. It is shown that exotic decays of scalar mesons arise as a result of mixing of vacuum a0 and π states. The pion electromagnetic formfactor obtains an unusual parity-odd supplement and it contributes into polarization asymmetry of pion polarizability. We hope that these indications of LPB can be identified in experiments on LHC, CBM FAIR and NICA collaborations.