Computer reconstruction of the decays of a B meson and an anti-B
meson from the BABAR experiment at the Stanford Linear Accelerator
Center. One B meson (gold tracks) decays into a J/Psi (which
decays to mu+ and mu-) and K-short (which decays to pi+ and pi-).
The other B meson (red tracks) decays into a K- and three pions.