Exotic meson decays in the environment with chiral imbalance

Abstract

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 ($\pi ,a_0$) are analyzed. It is shown that exotic decays of scalar mesons arise as a result of mixing of $\pi$ and $a_0$ vacuum states in the presence of chiral imbalance. The pion electromagnetic formfactor obtains an unusual parity-odd supplement which generates a photon polarization asymmetry in pion polarizability. We hope that the above pointed indications of LPB can be identified in experiments on LHC, RHIC, CBM FAIR and NICA accelerators.

arXiv comment10 pages, talk given at XXIII International Workshop on High Energy Physics and Quantum Field Theory, Yaroslavl', June 26 - July 3, 2017 and at IV Russian-Spanish Congress: Particle, Nuclear, Astroparticle Physics and Cosmology, JINR Dubna, September 4-8, 2017

References in corpus (12)

• Possibility of spontaneous parity violation in hot QCD
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Detailed measurement of the e+e- pair continuum in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV and implications for direct photon production
• Notes on Anomaly Induced Transport
• Hadron Production in Ultra-relativistic Nuclear Collisions: Quarkyonic Matter and a Triple Point in the Phase Diagram of QCD
• Bose--Einstein Condensation and Thermalization of the Quark Gluon Plasma
• Dielectron production in 12C+12C collisions at 2 AGeV with HADES
• Study of QCD Phase Diagram with Non-Zero Chiral Chemical Potential
• An effective QCD Lagrangian in the presence of an axial chemical potential
• Dilepton excess from local parity breaking in baryon matter
• Charged pions tagged with polarized photons probing strong CP violation in a chiral-imbalance medium
• Phases of hot and dense QCD matter

Cited by in corpus (2)

• Chiral imbalance in hadron matter : its manifestation in photon polarization asymmetries
• Chiral-Imbalance Density Wave in Baryonic Matters