Oscillations of B(s)(0)mesons were studied in events with a large tran
sverse momentum lepton selected from 3.2 million hadronic Z(0) decays
registered by DELPHI between 1991 and 1994. A limit on the mass differ
ence between the physical B-s(0) states Delta m(s) > 6.5 ps(-1) at 95%
C.L. was obtained by combining the results obtained in three channels
. (C) 1997 Published by Elsevier Science B.V.