2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226058Measurements are presented of R_b, the ratio of the b bbar cross-section to the q qbar cross-section in e+e- collisions, and the forward-backward asymmetry A^b_FB at twelve energy points in the range sqrt(s) = 130-207 GeV. These results are found to be consistent with the Standard Model expectations. The measurements are used to set limits on new physics scenarios involving contact interactions.23 pages, 6 figures, Accepted by Eur. Phys. J. CHigh Energy Physics - Experimenttext