Three-particle relativistic kinematics

For reactions leading to three particles in the final state, five independent variables are assigned to the polar and azimuthal angles of two particles and the kinetic energy of one of them. Formulas are given for calculations of other variables from these five. Formulas are also given for transformations of polar and azimuthal angles from the laboratory system to the rest frames of two-particle systems. A FORTRAN programme using these formulas is included in an appendix. (author)