2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148826Based on the standard statistical interpretation of mixed quantum states, a unique family of consistent histories has been constructed for the quantum Brownian motion in the Caldeira-Leggett reservoir. Analytic solutions have been shown in the Markovian regime: they are uniquely defined coherent wave packets travelling near classical trajectories.10pp LaTex, resubmitted because arXive can not process v1, no revision, just typos correctedGeneral Relativity and Quantum Cosmologytext