Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes tau-->enunuBAR, tau-->mununuBAR, tau-->rhonu tau-->a1nu, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters A(tau) and A(e), where A(l) = 2g(V)l g(A)l/[(g(V)l)2 + (g(A)l)2]. The results A(tau) = 0.143 +/- 0.023 and A(e) = 0. 120 +/- 0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin 2theta(W)eff = 0.2332 +/- 0.0022.

Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1993). Measurement of the tau polarisation at the Z resonance. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 59(3), 369-386 [10.1007/BF01498618].

Measurement of the tau polarisation at the Z resonance

CARPINELLI, Massimo;
1993

Abstract

Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes tau-->enunuBAR, tau-->mununuBAR, tau-->rhonu tau-->a1nu, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters A(tau) and A(e), where A(l) = 2g(V)l g(A)l/[(g(V)l)2 + (g(A)l)2]. The results A(tau) = 0.143 +/- 0.023 and A(e) = 0. 120 +/- 0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin 2theta(W)eff = 0.2332 +/- 0.0022.
Articolo in rivista - Articolo scientifico
DECAYS; POLARIZATION; LEPTONS; LEP;
English
1993
59
3
369
386
none
Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1993). Measurement of the tau polarisation at the Z resonance. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 59(3), 369-386 [10.1007/BF01498618].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390414
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