Sumit Sen has observed in one old mail  that the time of flight of the hits produced in bbsim has tipically a value of ~ nsec  but occasionally is ~1e-7 sec.

I've investigated this strange results and I've discovered that producing a sample of B-Bbar events the distribution of the  ToF stored in the DCH hits is the following:
 

In the picture ToF of the order of microseconds are visible for some ( few) produced hits.

The particles producing these hits are electrons or positrons.
The scanning of the events where these ToF are present has shown that these electrons ( positrons)  have been produced in decays of low energy muons, then the ToF is correct.
In the following pictures the hits produced in the Drift chamber for some of these events are shown.
The red and green tracks are electrons and positrons; the  yellow and pink  tracks are muons- (+).
The tracks with high ToF [e -(+)] are produced directly in the chamber or in the contiguous  subdetectors  through the
decay of muons.

For comments/questions  contact lamanna@roma1.infn.it