Dilepton and Photon Productions from a Coherent Pion Oscillation

Abstract

Since the electromagnetic current for a pion system coincides with the third component of the isovector current, the isospin angular oscillation of a coherent field can be a significant source for the electromagnetic emissions. We study the characteristic dilepton and photon emissions from the classical pion field oscillation in the QCD vacuum. The general analytical solution obtained in the nonlinear sigma model is used to calculate the electromagnetic current density, which exhibits a light-front singularity and decreases rapidly as inverse square of the proper time due to a longitudinal expansion. The momentum and invariant mass spectra of the direct photon and dilepton are found to be a sensitive probe of the space-time evolution of the chiral condensate field.

11 pages in RevTeX with 2 figures (epsfig style) embedded

References in corpus (7)

• Emergence of Coherent Long Wavelength Oscillations After a Quench: Application to QCD
• Nonequilibrium Quantum Dynamics Of Disoriented Chiral Condensates
• How to Make Large Domains of Disoriented Chiral Condensate
• Larger Domains of Disoriented Chiral Condensate Through Annealing
• How Disoriented Chiral Condensates Form: Quenching vs. Annealing
• Reinterpretation of Thermal Dilepton Emission Rate by Spectral Functions
• General Classical Solutions of Nonlinear $\sigma$-Model and Pion Charge Distribution of Disoriented Chiral Condensate

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• Photoproduction Enhancement from Non Equilibrium Disoriented Chiral Condensates
• Langevin Evolution of Disoriented Chiral Condensate
• Dileptons from Disoriented Chiral Condensates
• Out-of-equilibrium electromagnetic radiation
• Dynamical simulation of DCC formation in Bjorken rods
• Analysis of DCC Domain Structure
• Photon Production from Nonequilibrium Disoriented Chiral Condensates in a Spherical Expansion
• Out-of-equilibrium Photon Production from Disoriented Chiral Condensates
• Photon production from non-equilibrium disoriented chiral condensates in a longitudinal expansion : A theoretic framework