Bound on dissipative effects from semileptonic neutral B-meson decays

The semileptonic decay asymmetry A(Delta m) is studied within the open quantum systems approach to the physics of the neutral meson B-0-($) over barB(0) system: this extended treatment takes into account possible non-standard, dissipative effects induced by the presence of an external environment. Abound on these effects is provided through the analysis of available experimental data from the Belle Collaboration.