2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46385The full order $α_s^4$ perturbative QCD calculation of the production of $B_c$ mesons at the Tevatron is compared with the fragmentation approximation. The non-fragmentation diagrams, in which two or more quarks and/or gluons can simultaneously be nearly on-shell, are important unless $P_T\gg M_{B_c}$.8 pages, Latex File, Talk given at the American Physical Sociaty, Division of Particles and Fields Meeting, 10-15 August 1996High Energy Physics - Phenomenologytext