HEPData

The correlated production of Lambda and Lambdabar baryons has been studied using 4.3 million multihadronic Zo decays recorded with the OPAL detector at LEP. Di-lambda pairs were investigated in the full data sample and for the first time also in 2-jet and 3-jet events selected with the k_t algorithm. The distributions of rapidity differences from correlated Lambda-Lambdabar pairs exhibit short-range, local correlations and prove to be a sensitive tool to test models, particularly for 2-jet events. The JETSET model describes the data best but some extra parameter tuning is needed to improve agreement with the experimental results in the rates and the rapidity spectra simultaneously. The recently developed modification of JETSET, the MOdified Popcorn Scenarium (MOPS), and also HERWIG do not give satisfactory results. This study of di-lambda production in 2- and 3-jet events supports the short-range compensation of quantum numbers.

5 data tables

Table 1

Average multipicity of LAMBDA pairs in hadronic events.

Table 2

Average multipicity of LAMBDA pairs in 2-Jet events.

Table 3

Average multipicity of LAMBDA pairs in 3-Jet events.

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A Model independent measurement of quark and gluon jet properties and differences

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.

Z.Phys. C68 (1995) 179-202, 1995.

Inspire Record 396179 DOI 10.17182/hepdata.47862

3 data tables

Table 1

THETA is the angle between hadron and jet's axis. CONST is the parameter used in jet's definition (see text).

Table 2

CONST is the parameter used in jet's definition (see text).

Table 3

CONST is the parameter used in jet's definition (see text).

A Study of mean subjet multiplicities in two and three jet hadronic Z0 decays

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.

Z.Phys. C63 (1994) 363-376, 1994.

Inspire Record 372997 DOI 10.17182/hepdata.48236

4 data tables

Table 1

Ratio of multiplicities of sub-jets from 3 and 2 jet samples. Data are corrected to the hadron level and have combined statistical and systematic errors.

Table 2

Sub-jet multiplicity for 3 jet sample. Data corrected to the hadron level and have combined statistical and systematic errors.

Table 3

Sub-jet multiplicity for 2 jet sample. Data corrected to the hadron level and have combined statistical and systematic errors.

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QCD studies using a cone based jet finding algorithm for $e^{+} e^{-}$ collisions at LEP

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.

Z.Phys. C63 (1994) 197-212, 1994.

Inspire Record 373000 DOI 10.17182/hepdata.48238

16 data tables

Table 1

Measured 2 jet production rate as a function of EPSILON, the minimum energy of a jet for a fixed cone radius R = 0.7 radians.

Table 2

Measured 2 jet production rate as a function of R, the jet cone radius, for a fixed value of the minimum jet energy, EPSILON, of 7 GeV.

Table 3

Measured 3 jet production rate as a function of EPSILON, the minimum energy of a jet for a fixed cone radius R = 0.7 radians.

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Charged particle multiplicity distributions for fixed number of jets in Z0 hadronic decays

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adami, F. ; et al.

Z.Phys. C56 (1992) 63-76, 1992.

Inspire Record 334948 DOI 10.17182/hepdata.14533

3 data tables

Table 1

Corrected charged particle multiplicity for jet resolution parameter YCUT = 0.01.

Table 2

Corrected charged particle multiplicity for jet resolution parameter YCUT = 0.02.

Table 3

Corrected charged particle multiplicity for jet resolution parameter YCUT = 0.04.

A Study of the recombination scheme dependence of jet production rates and of alpha-s (m(Z0)) in hadronic Z0 decays

The OPAL collaboration Akrawy, M.Z. ; Alexander, G. ; Allison, John ; et al.

Z.Phys. C49 (1991) 375-384, 1991.

Inspire Record 299833 DOI 10.17182/hepdata.15085

9 data tables

Table 1

Jet production rates using the E0 recombination scheme.

Table 2

Jet production rates using the E recombination scheme.

Table 3

Jet production rates using the p0 recombination scheme.

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A Study of jet rates and measurement of alpha-s at the Z0 resonance

Lauber, Jan A. ;

PhD Thesis, 1993.

Inspire Record 353248 DOI 10.17182/hepdata.18664

9 data tables

Table 1

Jet production rates using the JADE recombination scheme.

Table 2

Jet production rates using the DURHAM recombination scheme.

Table 3

Jet production rates using the E recombination scheme.

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A Global determination of $\alpha^- s$ (M(z0) ) at LEP

The OPAL collaboration Acton, P.D. ; Alexander, G. ; Allison, John ; et al.

Z.Phys. C55 (1992) 1-24, 1992.

Inspire Record 333079 DOI 10.17182/hepdata.14606

16 data tables

Table 1

Differential jet mass distribution for the heavier jet using method T. The data are corrected for the finite acceptance and resolution of the detector and for initial state photon radiation.

Table 2

Differential jet mass distribution for the jet mass difference using methodT. The data are corrected for the finite acceptance and resolution of the detec tor and for initial state photon radiation.

Table 3

Differential jet mass distribution for the heavier jet using method M. The data are corrected for the finite acceptance and resolution of the detector and for initial state photon radiation.