409011 SzGeCERN 20161219131716.0 oai:cds.cern.ch:409011 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-OPEN-99-340 eng Büscher, V CERN Search for pair production of unstable heavy leptons in $e^{+}e^{-}$ collisions at centre-of-mass energies of 161 and 172 GeV 1997 Geneva CERN 29 Jul 1997 5 p The data collected at 161 and 172 GeV by ALEPH at LEP, corresponding to an integrated luminosity of about 22 pb-1, are analysed in a search for pair-production of heavy leptons. No evidence for a signal was found. New limits on production cross-sections and on masses of sequential leptons are set, which significantly improve existing limits from searches at LEP1.5. CERN EDS 991129SLAC SzGeCERN Particle Physics - Experiment CERN e+ e- CERN PREPRINT CERN LEP ALEPH ALEPH Collaboration EP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=open-99-340 Access to fulltext document http://cds.cern.ch/record/409011/files/open-99-340.pdf Access to fulltext document http://cds.cern.ch/record/409011/files/open-99-340.ps.gz Access to fulltext document catherine.cart@cern.ch n 199948 11 20101108 1208 CER01 19991123 319858 jerusalem970819 PUBLIC 000335952CER PREPRINT ConferencePaper