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An upper limit on the $\tau$ neutrino mass from three- and five-prong tau decays (1997)

Abstract
A bound on the tau neutrino mass is established using the data collected from 1991 to 1995 at Ecm = M(Z) with the ALEPH detector. Two separate limits are derived by fitting the distribution of visible energy vs invariant mass in tau+ -> pi+ pi+ pi- nu and tau+ -> pi+ pi+ pi- pi- pi+ (pi0) nu decays. The two results are combined to obtain a 95 % confidence level upper limit of 18.2 MeV/c^2 on the mass of the tau neutrino.

Publication details
Download http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ppe-97-138
http://cdsweb.cern.ch/record/337738/files/ppe-97-138.pdf
http://cdsweb.cern.ch/record/337738/files/ppe-97-138.ps.gz
Repository CERN Document Server (Switzerland)
Keywords Particle Physics - Experimental Results
Language eng