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Tau Polarization Measurement in the L3 Detector; Medida de la polarizacion del Tau en el detector L3

Abstract

The Polarization asymmetry (A{sub p}) measurement can be obtained from the energy spectra of the tau lepton (tau) decay products. This measurement provides a precise determination of the weak mixing angel (sin``2 tilde char theta{sub w}), one of the Standard Model fundamental parameters. Tau leptons are produced at LEP in e``+e``-yields tilde char f interactions at a center of mass energy of the order of the Z boson mass. In order to get A{sub p} we have calculated the analytical formulae of the tau decay products energy spectra, including radiative corrections, for all of the one prong tau decay channels. We have also extended this analytical formalism to the detector level, including the selection criteria effects and the detector resolution (calibration) in the analytical expressions. Detailed studies have been performed concerning our measurement using this formalism. From the data collected with the L3 detector between 1991 and 1994, which corresponds to an integrated luminosity of 118.8 pb``1 at a center of mass energy of the order of the Z mass, we have identified and selected the following tau decay channel samples: tau yields e nu tilde char nu, tau yields mu nu tilde char nu, tau yields pi/K nu y  More>>
Authors:
Publication Date:
Jun 01, 1996
Product Type:
Technical Report
Report Number:
CIEMAT-783
Reference Number:
SCA: 662430; 662370; PA: SPN-96:0B0243; EDB-96:096699; NTS-96:019600; SN: 96001597202
Resource Relation:
Other Information: PBD: 1996
Subject:
66 PHYSICS; POLARIZATION; TAU PARTICLES; ASYMMETRY; LEPTONS; ENERGY SPECTRA; CERN; DAUGHTER PRODUCTS
OSTI ID:
237394
Research Organizations:
No corporate text available (Country unknown/Code not available)
Country of Origin:
Spain
Language:
Spanish
Other Identifying Numbers:
Other: ON: DE96754954; TRN: ES96B0243
Availability:
INIS; OSTI as DE96754954
Submitting Site:
INIS
Size:
137 p.
Announcement Date:

Citation Formats

Garcia, P. Tau Polarization Measurement in the L3 Detector; Medida de la polarizacion del Tau en el detector L3. Spain: N. p., 1996. Web.
Garcia, P. Tau Polarization Measurement in the L3 Detector; Medida de la polarizacion del Tau en el detector L3. Spain.
Garcia, P. 1996. "Tau Polarization Measurement in the L3 Detector; Medida de la polarizacion del Tau en el detector L3." Spain.
@misc{etde_237394,
title = {Tau Polarization Measurement in the L3 Detector; Medida de la polarizacion del Tau en el detector L3}
author = {Garcia, P}
abstractNote = {The Polarization asymmetry (A{sub p}) measurement can be obtained from the energy spectra of the tau lepton (tau) decay products. This measurement provides a precise determination of the weak mixing angel (sin``2 tilde char theta{sub w}), one of the Standard Model fundamental parameters. Tau leptons are produced at LEP in e``+e``-yields tilde char f interactions at a center of mass energy of the order of the Z boson mass. In order to get A{sub p} we have calculated the analytical formulae of the tau decay products energy spectra, including radiative corrections, for all of the one prong tau decay channels. We have also extended this analytical formalism to the detector level, including the selection criteria effects and the detector resolution (calibration) in the analytical expressions. Detailed studies have been performed concerning our measurement using this formalism. From the data collected with the L3 detector between 1991 and 1994, which corresponds to an integrated luminosity of 118.8 pb``1 at a center of mass energy of the order of the Z mass, we have identified and selected the following tau decay channel samples: tau yields e nu tilde char nu, tau yields mu nu tilde char nu, tau yields pi/K nu y tau yields p/K*nu. From the analysis of these samples we get the tau polarization asymmetry measurement: A{sub p}=0.143+-0.014+-0.010, which corresponds to a value of sin``2 tilde char theta{sub w}=0.2320+-0.0018+-0.0013. (Author) 24 refs}
place = {Spain}
year = {1996}
month = {Jun}
}