Limits on ντ mass by DELPHI

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Bibliographic Details
Title: Limits on ντ mass by DELPHI
Authors: Perego, D.L.1 davide.perego@mib.infn.it
Source: Nuclear Physics B Proceedings Supplement. Jul2003, Vol. 123 Issue 1-3, p251. 9p.
Subjects: Neutrino mass, Radioactive decay, Nuclear physics
Abstract: A limit on the tau neutrino mass is obtained using all the Z0 → τ+τ− data collected at LEP by the DELPHI detector between 1992 and 1995. In this analysis events in which one of the taus decays into one charged particle, while the second τ decays into five charged pions (1–5 topology) have been used.The neutrino mass is determined from a bidimensional fit on the invariant mass m5π* and on the energy E5π of the five π± system. The result found is mντ < 48.0 MeV/c2 at 95% confidence level. [Copyright &y& Elsevier]
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Description
Abstract:A limit on the tau neutrino mass is obtained using all the <F>Z0 → τ+τ−</F> data collected at LEP by the DELPHI detector between 1992 and 1995. In this analysis events in which one of the taus decays into one charged particle, while the second τ decays into five charged pions (1–5 topology) have been used.The neutrino mass is determined from a bidimensional fit on the invariant mass <F>m5π&ast;</F> and on the energy <F>E5π</F> of the five <F>π±</F> system. The result found is <F>mντ</F> < 48.0 MeV/c2 at 95% confidence level. [Copyright &y& Elsevier]
ISSN:09205632
DOI:10.1016/S0920-5632(03)02185-6