2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202646Recoupling matrix elements are evaluated, in the harmonic oscillator approximation, for all possible angular and radial excitations in processes where quarks recombine. A diagrammatic representation is given. Their use is demonstrated in calculating the transition potential for rho to two pions in a pair creation model.15 pages, 10 figuresHigh Energy Physics - Phenomenologytext