Nucleon-Antinucleon Annihilation in Large Nc QCD with rho and omega Mesons
Abstract
Description
We use classical/large Nc (number of colors) QCD to study nucleon--antinucleon annihilation at rest. We include pion, rho and omega fields in the classical dynamics, starting from the nonlinear sigma model. We begin with a spherical blob of pionic matter with zero baryon number and energy of twice the nucleon mass. This evolves according to the classical dynamics to pion and vector meson fields into the radiation zone. The radiation fields are quantized using the method of coherent states modified to include isospin and four momentum conservation. Empirical information is extracted from that coherent state. We find good agreement with data for single particle momentum and number spectra, and with branching ratios to many annihilation channels. All this emerges with nearly no free parameters.
A LaTex file which generates 22 pages of text. 17 postscript figures and a table-style file available by anonymous ftp at ftp://dept.physics.upenn.edu/pub/yanglu/ . (Check the file READ.ME there for information.) Submitted to Phys.Rev.C
A LaTex file which generates 22 pages of text. 17 postscript figures and a table-style file available by anonymous ftp at ftp://dept.physics.upenn.edu/pub/yanglu/ . (Check the file READ.ME there for information.) Submitted to Phys.Rev.C