CERN Accelerating science

Preprint
Report number	CERN-OPEN-99-328
Title	Update of $\Lambda$ polarization from Z decays
Preprint title	Updated measurement of the Polarization of Lambda's from Z decays
Author(s)	Hansen, P H (CERN)
Publication	1997
Collaboration	ALEPH Collaboration
Imprint	19 Aug 1997
Number of pages	9
Presented at	International Europhysics Conference on High-Energy Physics, Jerusalem, Israel, 19 - 25 Aug 1997
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LEP ; ALEPH
Abstract	The measurement of Lambda polarization from Z decays with the Aleph detector has been updated with 1995 data and more extensive simulation. The measurement is compared with two models, one based on the simple quark model and one applying SU(3) flavor symmetry on the measured nucleon spin structure function. While the first model is in best agreement with the data, the second one is also consistent, given the uncertainties in the Lambda production mechanism.
Submitted by	catherine.cart@cern.ch