Using data collected with the ALEPH detector at LEP correlations between the decay products of the tau+ and tau- produced in the decay of the Z have been measured. The measurements performed in the decays tau-> pi nu and tau->rho nu place limits on deviations from the Standard Model. These are given by the parameter csi with csi=-1 for the Standard Model. The measured values are csi_pi = −0.95 +/- 0.11 +/-0.05 and csi_rho=−1.03 +/- 0.11 +/- 0.05. For models which predict csi_pi= csi_rho=csi - interpreted as the average tau neutrino helicity - the measurement is csi = −0.99 +/- 0.07 +/- 0.04.
Correlation measurements in Z-> tau+ tau- and the tau neutrino helicity
G. Batignani;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FIDECARO, FRANCESCO;F. Forti;MESSINEO, ALBERTO MARIA;G. Rizzo;TONELLI, GUIDO EMILIO;G. Triggiani;
1994-01-01
Abstract
Using data collected with the ALEPH detector at LEP correlations between the decay products of the tau+ and tau- produced in the decay of the Z have been measured. The measurements performed in the decays tau-> pi nu and tau->rho nu place limits on deviations from the Standard Model. These are given by the parameter csi with csi=-1 for the Standard Model. The measured values are csi_pi = −0.95 +/- 0.11 +/-0.05 and csi_rho=−1.03 +/- 0.11 +/- 0.05. For models which predict csi_pi= csi_rho=csi - interpreted as the average tau neutrino helicity - the measurement is csi = −0.99 +/- 0.07 +/- 0.04.File in questo prodotto:
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