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Measurement of the Tau polarisation at LEP
- Source :
- European Physical Journal C: Particles and Fields, European Physical Journal C: Particles and Fields, 2001, 20, pp.401-430, Scopus-Elsevier, European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2001, 20, pp.401-430, 20 (2001): 401–430., info:cnr-pdr/source/autori:ALEPH Collaboration/titolo:Measurement of the TAU polarisation at LEP/doi:/rivista:/anno:2001/pagina_da:401/pagina_a:430/intervallo_pagine:401–430/volume:20
- Publication Year :
- 2001
- Publisher :
- HAL CCSD, 2001.
-
Abstract
- The polarisation of $\tau$'s produced in Z decay is measured using 160 pb$^{-1}$ of data accumulated at LEP by the ALEPH detector between 1990 and 1995. The variation of the polarisation with polar angle yields the two parameters ${\cal A}_e = 0.1504 \pm 0.0068 $ and ${\cal A}_{\tau} = 0.1451 \pm 0.0059$ which are consistent with the hypothesis of $e$-$\tau$ universality. Assuming universality, the value ${\cal A}_{e{-}\tau} = 0.1474 \pm 0.0045$ is obtained from which the effective weak mixing angle $\sin^2 {\theta_{\mathrm{W}}^{\mathrm{eff}}} =0.23147 \pm 0.00057 $ is derived.<br />Comment: 52 pages, 30 figures
- Subjects :
- Physics
Particle physics
Physics and Astronomy (miscellaneous)
010308 nuclear & particles physics
Electron–positron annihilation
particelle
FOS: Physical sciences
Weinberg angle
Polarization (waves)
01 natural sciences
High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex)
polarizzazione
0103 physical sciences
LEP TAU
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Angular dependence
High Energy Physics::Experiment
010306 general physics
Engineering (miscellaneous)
Particle Physics - Experiment
Subjects
Details
- Language :
- English
- ISSN :
- 14346044 and 14346052
- Database :
- OpenAIRE
- Journal :
- European Physical Journal C: Particles and Fields, European Physical Journal C: Particles and Fields, 2001, 20, pp.401-430, Scopus-Elsevier, European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2001, 20, pp.401-430, 20 (2001): 401–430., info:cnr-pdr/source/autori:ALEPH Collaboration/titolo:Measurement of the TAU polarisation at LEP/doi:/rivista:/anno:2001/pagina_da:401/pagina_a:430/intervallo_pagine:401–430/volume:20
- Accession number :
- edsair.doi.dedup.....b8802ca79d874ed2376797270211a6b9