Search for micro* pi * mass enhancements in neutrino- and antineutrino-deuterium charged-current interactions.

A search for \ensuremath{\mu}\ensuremath{\pi} mass enhancements was made using the CERN bubble chamber BEBC, filled with deuterium, exposed to wide-band neutrino and antineutrino beams. From a sample of 15 275 neutrino and 11 100 antineutrino charged-current events, no significant \ensuremath{\mu}\ensuremath{\pi} mass enhancement is observed. Upper limits are quoted.