@article{82370b83cfa74115bfc319b858f20375,
title = "A first measurement of the Λ{\=Λ} and ΛΛ ({\=Λ}{\=Λ}) spin compositions in hadronic Z0 decays",
abstract = "The spin composition of Λ{\=Λ}, ΛΛ and {\=Λ}{\=Λ} pairs at low invariant mass values has been measured for the first time in multihadronic Z0 decays with the OPAL detector at LEP. No single spin state has been observed in the Λ{\=Λ} sample, verifying that the low mass enhancement in this sample, attributed to local baryon number compensation, is not a resonance state. The fraction of the spin 1 contribution to the Λ{\=Λ} pairs was found to be consistent with the value 0.75, as expected from a statistical spin mixture. This may be the net effect of many different QCD processes which contribute to the hyperon anti-hyperon pair production. The spin composition of the identical ΛΛ and {\=Λ}{\=Λ} pairs, well above threshold, is found to be similar to that of the Λ{\=Λ} sample. A ΛΛ emitter dimension is estimated from the data assuming the onset of the Pauli exclusion principle near threshold.",
author = "{OPAL Collaboration} and G. Alexander and J. Allison and N. Altekamp and K. Ametewee and KJ Anderson and S. Asai and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and R. Bartoldus and Batley, {J. R.} and G. Beaudoin and J. Bechtluft and C. Beeston and T. Behnke and Bell, {A. N.} and Bell, {K. W.} and G. Bella and S. Bentvelsen and P. Berlich and S. Bethke and O. Biebel and V. Blobel and Bloodworth, {I. J.} and Bloomer, {J. E.} and P. Bock and Bosch, {H. M.} and M. Boutemeur and Bouwens, {B. T.} and S. Braibant and Brown, {R. M.} and Burckhart, {H. J.} and C. Burgard and R. B{\"u}rgin and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and C. Charlesworth and Charlton, {D. G.} and D. Chrisman and Chu, {S. L.} and Clarke, {P. E.L.} and I. Cohen and Conboy, {J. E.} and Cooke, {O. C.} and R. Folman",
note = "Funding Information: NaturalS ciencesa ndE ngineeringR esearchC ouncil, Canada, IsraelM inistry of Science, Israel ScienceF oundationa, dministerebdy theI srael Academyo f Sciencea ndH umanities, MinervaG esellschaft, JapaneseM inistry of EducationS, ciencea ndC ulture (the Monbusho) and a grant under the Monbusho InternationaSl cienceR esearchP rogram, German Israeli Bi-national Science Foundation (GIF), Directiond esS ciencesd ela Matike du Commissariat a 1{\textquoteright}EnergieA tomique,F rance, Bundesministeriumf ti Bildung, Wissenschaft, Forschungu nd TechnologieG, ermany, NationalR esearchC ouncil of Canada, HungarianF oundationfo r ScientificR esearchO, TKA T-016660,a ndO TKA F-015089.",
year = "1996",
month = sep,
day = "19",
doi = "10.1016/0370-2693(96)00860-X",
language = "English",
volume = "384",
pages = "377--387",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
number = "1-4",
}