Determination of the tau-neutrino helicity

Using the ARGUS detector at the DORIS II e + e − storage ring we measured for the first time the τ neutrino helicity from a parity violating asymmetry in the τ decay into three charged pions. From the measured asymmetry we derived the normalized product of the axial and vector coupling constant 2 g A g v / ( g A 2 + g V 2 ) = 1.14±0.34 −0.17 0.34 , which is in good agreement with the standard model prediction.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
tau: electroproduction
electroproduction: tau
tau: semileptonic decay
semileptonic decay: tau
neutrino/tau: helicity
dependence: momentum transfer

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