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Measurement of Lambda polarization from Z decays
ALEPH Collaboration
1996
发表期刊PHYSICS LETTERS B
卷号374期号:4页码:#REF!
通讯作者Buskulic, D (reprint author), INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, PHYS PARTICULES LAB, F-74019 ANNECY LE VIEUX, FRANCE.
文章类型Article
摘要The polarization of Lambda baryons from Z decays is studied with the ALEPH apparatus. Evidence of longitudinal polarization of s quarks from Z decay is observed for the first time. The measured longitudinal Lambda polarization is P-L(Lambda) = -0.32 +/- 0.07 for z = p/pbeam > 0.3. This agrees with the prediction of -0.39 +/- 0.08 from the standard model and the constituent quark model, where the error is due to uncertainties in the mechanism for Lambda production. The observed Lambda polarization is diluted with respect to the primary s quark polarization by Lambda baryons without a primary s quark. Measurements of the Lambda forward-backward asymmetry and of the correlation between back-to-back Lambda<(Lambda)over bar> pairs are used to check this dilution. In addition the transverse Lambda polarization is measured. An indication of transverse polarization, more than two standard deviations away from zero, is found along the normal to the plane defined by the thrust axis and the Lambda direction.
学科领域Physics
收录类别SCI
WOS类目Physics, Multidisciplinary
WOS记录号WOS:A1996UM34500007
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被引频次:127[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/227539
专题实验物理中心
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ALEPH Collaboration. Measurement of Lambda polarization from Z decays[J]. PHYSICS LETTERS B,1996,374(4):#REF!.
APA ALEPH Collaboration.(1996).Measurement of Lambda polarization from Z decays.PHYSICS LETTERS B,374(4),#REF!.
MLA ALEPH Collaboration."Measurement of Lambda polarization from Z decays".PHYSICS LETTERS B 374.4(1996):#REF!.
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