Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-04-11
Phys.Lett. B383 (1996) 457-462
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages in RevTeX with 2 figures (epsfig style) embedded
Scientific paper
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.
Huang Zheng
Wang Xin-Nian
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