Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes tau ->e nu (nu) over bar, tau ->mu nu (nu) over bar, tau ->rho nu tau ->a1 nu, 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 (theta(W)eff))^2 = 0.2332 +/- 0.0022.

D., B., D., D., C., G., J. P., L., M. N., M., B., M., et al. (1993). Measurement of the tau polarization At the Z-resonance. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 59(3), 369-386 [10.1007/BF01498618].

Measurement of the tau polarization At the Z-resonance

BOTTIGLI, UBALDO;CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1993-01-01

Abstract

Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes tau ->e nu (nu) over bar, tau ->mu nu (nu) over bar, tau ->rho nu tau ->a1 nu, 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 (theta(W)eff))^2 = 0.2332 +/- 0.0022.
1993
D., B., D., D., C., G., J. P., L., M. N., M., B., M., et al. (1993). Measurement of the tau polarization 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/11365/36479
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