Springer LINK: The European Physical Journal C - Abstract Volume 5 Issue 2 (1998) pp 229-237

The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

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Abstract Volume 5 Issue 2 (1998) pp 229-237
DOI 10.1007/s100529800976

experimental physics:
An upper limit for the $\tau$-neutrino mass from $\tau\rightarrow 5\pi^{\pm}\nu_{\tau}$ decays

The OPAL Collaboration , K. Ackerstaff et al. (8)

(8) CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland

Received: 15 April 1998 / Published online: 12 August 1998

Abstract. An upper limit for the $\tau$-neutrino mass has been determined from the decay $\tau\rightarrow 5\pi^{\pm}\nu_{\tau}$ using data collected with the OPAL detector from 1991 to 1995 in $\rm e^{+}e^{-}$ collisions at $\sqrt{s}\approx M_\mathrm{Z}$. A limit of 43.2 MeV at 95% CL is obtained using a two-dimensional method in the $5\pi$ invariant mass and energy distribution from 22 selected events. Combining this result with OPAL's previously published measurement using $\rm \tau^{+}\tau^{-}\rightarrow 3h^{\pm}\bar{\nu}_{\tau}+3h^{\mp}\nu_{\tau}$ decays, a new combined limit of $m_{\nu_{\tau}}<27.6$ MeV (95% CL) is obtained.

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The European Physical Journal C

experimental physics: An upper limit for the $\tau$-neutrino mass from $\tau\rightarrow 5\pi^{\pm}\nu_{\tau}$ decays

experimental physics:
An upper limit for the $\tau$-neutrino mass from $\tau\rightarrow 5\pi^{\pm}\nu_{\tau}$ decays