Eur. Phys. J. C 36, 1-23 (2004) - DOI 10.1140/epjc/s2004-01881-6

Published online: 23 June 2004

Erratum published online: 6 August 2004

The last sentence of the first paragraph of Sect. 2 has been changed to read as follows:

Searches assuming R p -violation via one \(\lambda^\prime_{ijk} {\rm L}_i {\rm Q}_j {\rm\bar D}_k\) term (non-conservation of L) were not performed in DELPHI for data collected in 1999 and 2000.