When an electron and positron (antielectron) collide at high energy they can annihilate to produce D+ and D- mesons (charm particles).
Frames 2 and 3 show the annihilation of the electron and the positron into a virtual gamma or virtual Z boson. In frame 4, a charm quark and a charm antiquark emerge from the gamma/Z. In frame 5 they begin moving apart, stretching the color force field (gluon field) between them.
The intermediate stages of this process occur in less than almost a billionth of a billionth of a billionth of a second, and are not observable.
You can also see this as ANIMATION if you are using Netscape. Depending on where you are and the time of day this could be very slow.
