A first measurement of the ΛΛ̄ and ΛΛ (Λ̄Λ̄) spin compositions in hadronic Z0 decays

G. Alexander; J. Allison; N. Altekamp; K. Ametewee; KJ Anderson; S. Asai; D. Axen; G. Azuelos; A. H. Ball; E. Barberio; R. J. Barlow; R. Bartoldus; J. R. Batley; G. Beaudoin; J. Bechtluft; C. Beeston; T. Behnke; A. N. Bell; K. W. Bell; G. Bella; S. Bentvelsen; P. Berlich; S. Bethke; O. Biebel; V. Blobel; I. J. Bloodworth; J. E. Bloomer; P. Bock; H. M. Bosch; M. Boutemeur; B. T. Bouwens; S. Braibant; R. M. Brown; H. J. Burckhart; C. Burgard; R. Bürgin; P. Capiluppi; R. K. Carnegie; A. A. Carter; J. R. Carter; C. Y. Chang; C. Charlesworth; D. G. Charlton; D. Chrisman; S. L. Chu; P. E.L. Clarke; I. Cohen; J. E. Conboy; O. C. Cooke; M. Cuffiani; S. Dado; C. Dallapiccola; G. M. Dallavalle; S. de Jong; L. A. del Pozo; K. Desch; M. S. Dixit; E. do Couto e Silva; M. Doucet; E. Duchovni; G. Duckeck; I. P. Duerdoth; J. E.G. Edwards; P. G. Estabrooks; H. G. Evans; M. Evans; F. Fabbri; P. Fath; F. Fiedler; M. Fierro; H. M. Fischer; R. Folman; D. G. Fong; M. Foucher; H. Fukui; A. Fürtjes; P. Gagnon; A. Gaidot; J. W. Gary; J. Gascon; S. M. Gascon-Shotkin; N. I. Geddes; C. Geich-Gimbel; F. X. Gentit; T. Geralis; G. Giacomelli; P. Giacomelli; R. Giacomelli; V. Gibson; W. R. Gibson; D. M. Gingrich; J. Goldberg; M. J. Goodrick; W. Gorn; C. Grandi; E. Gross; M. Gruwé; C. Hajdu; G. G. Hanson; M. Hansroul; M. Hapke; C. K. Hargrove; P. A. Hart; C. Hartmann; M. Hauschild; C. M. Hawkes; R. Hawkings; R. J. Hemingway; G. Herten; R. D. Heuer; M. D. Hildreth; J. C. Hill; S. J. Hillier; T. Hilse; J. Hoare; P. R. Hobson; R. J. Homer; A. K. Honma; D. Horváth; R. Howard; R. E. Hughes-Jones; D. E. Hutchcroft; P. Igo-Kemenes; D. C. Imrie; M. R. Ingram; A. Jawahery; P. W. Jeffreys; H. Jeremie; M. Jimack; A. Joly; C. R. Jones; G. Jones; M. Jones; R. W.L. Jones; U. Jost; P. Jovanovic; T. R. Junk; D. Karlen; K. Kawagoe; T. Kawamoto; R. K. Keeler; R. G. Kellogg; B. W. Kennedy; B. J. King; J. Kirk; S. Kluth; T. Kobayashi; M. Kobel; D. S. Koetke; T. P. Kokott; S. Komamiya; R. Kowalewski; T. Kress; P. Krieger; J. von Krogh; P. Kyberd; G. D. Lafferty; H. Lafoux; R. Lahmann; W. P. Lai; D. Lanske; J. Lauber; S. R. Lautenschlager; J. G. Layter; D. Lazic; A. M. Lee; E. Lefebvre; D. Lellouch; J. Letts; L. Levinson; C. Lewis; S. L. Lloyd; F. K. Loebinger; G. D. Long; MJ Losty; J. Ludwig; A. Luig; A. Malik; M. Mannelli; S. Marcellini; C. Markus; A. J. Martin; J. P. Martin; G. Martinez; T. Mashimo; W. Matthews; P. Mättig; W. J. McDonald; J. McKenna; E. A. Mckigney; T. J. McMahon; A. I. McNab; R. A. McPherson; F. Meijers; S. Menke; F. S. Merritt; H. Mes; J. Meyer; A. Michelini; G. Mikenberg; D. J. Miller; R. Mir; W. Mohr; A. Montanari; T. Mori; M. Morii; U. Müller; H. A. Neal; B. Nellen; B. Nijjhar; R. Nisius; S. W. O'Neale; F. G. Oakham; F. Odorici; H. O. Ogren; T. Omori; M. J. Oreglia; S. Orito; J. Pálinkás; J. P. Pansart; G. Pásztor; J. R. Pater; G. N. Patrick; M. J. Pearce; S. Petzold; P. Pfeifenschneider; J. E. Pilcher; J. Pinfold; D. E. Plane; P. Poffenberger; B. Poli; A. Posthaus; H. Przysiezniak; D. L. Rees; D. Rigby; S. A. Robins; N. Rodning; J. M. Roney; A. Rooke; E. Ros; A. M. Rossi; M. Rosvick; P. Routenburg; Y. Rozen; K. Runge; O. Runolfsson; U. Ruppel; D. R. Rust; R. Rylko; E. K.G. Sarkisyan; M. Sasaki; C. Sbarra; A. D. Schaile; O. Schaile; F. Scharf; P. Scharff-Hansen; P. Schenk; B. Schmitt; S. Schmitt; M. Schroder; H. C. Schultz-Coulon; M. Schulz; P. Schütz; W. G. Scott; T. G. Shears; B. C. Shen; C. H. Shepherd-Themistocleous; P. Sherwood; G. P. Siroli; A. Sittler; A. Skillman; A. Skuja; A. M. Smith; T. J. Smith; G. A. Snow; R. Sobie; S. Söldner-Rembold; R. W. Springer; M. Sproston; A. Stahl; M. Starks; M. Steiert; K. Stephens; J. Steuerer; B. Stockhausen; D. Strom; F. Strumia; P. Szymanski; R. Tafirout; S. D. Talbot; S. Tanaka; P. Taras; S. Tarem; M. Tecchio; M. Thiergen; M. A. Thomson; E. von Törne; S. Towers; M. Tscheulin; T. Tsukamoto; E. Tsur; A. S. Turcot; M. F. Turner-Watson; P. Utzat; R. van Kooten; G. Vasseur; M. Verzocchi; P. Vikas; M. Vincter; E. H. Vokurka; F. Wäckerle; A. Wagner; C. P. Ward; D. R. Ward; J. J. Ward; P. M. Watkins; A. T. Watson; N. K. Watson; P. Weber; P. S. Wells; N. Wermes; J. S. White; B. Wilkens; G. W. Wilson; J. A. Wilson; T. Wlodek; G. Wolf; S. Wotton; T. R. Wyatt; S. Yamashita; G. Yekutieli; V. Zacek

doi:10.1016/0370-2693(96)00860-X

A first measurement of the ΛΛ̄ and ΛΛ (Λ̄Λ̄) spin compositions in hadronic Z⁰ decays

G. Alexander, J. Allison, N. Altekamp, K. Ametewee, KJ Anderson, S. Asai, D. Axen, G. Azuelos, A. H. Ball, E. Barberio, R. J. Barlow, R. Bartoldus, J. R. Batley, G. Beaudoin, J. Bechtluft, C. Beeston, T. Behnke, A. N. Bell, K. W. Bell, G. BellaS. Bentvelsen, P. Berlich, S. Bethke, O. Biebel, V. Blobel, I. J. Bloodworth, J. E. Bloomer, P. Bock, H. M. Bosch, M. Boutemeur, B. T. Bouwens, S. Braibant, R. M. Brown, H. J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, C. Charlesworth, D. G. Charlton, D. Chrisman, S. L. Chu, P. E.L. Clarke, I. Cohen, J. E. Conboy, O. C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola, G. M. Dallavalle, S. de Jong, L. A. del Pozo, K. Desch, M. S. Dixit, E. do Couto e Silva, M. Doucet, E. Duchovni, G. Duckeck, I. P. Duerdoth, J. E.G. Edwards, P. G. Estabrooks, H. G. Evans, M. Evans, F. Fabbri, P. Fath, F. Fiedler, M. Fierro, H. M. Fischer, R. Folman, D. G. Fong, M. Foucher, H. Fukui, A. Fürtjes, P. Gagnon, A. Gaidot, J. W. Gary, J. Gascon, S. M. Gascon-Shotkin, N. I. Geddes, C. Geich-Gimbel, F. X. Gentit, T. Geralis, G. Giacomelli, P. Giacomelli, R. Giacomelli, V. Gibson, W. R. Gibson, D. M. Gingrich, J. Goldberg, M. J. Goodrick, W. Gorn, C. Grandi, E. Gross, M. Gruwé, C. Hajdu, G. G. Hanson, M. Hansroul, M. Hapke, C. K. Hargrove, P. A. Hart, C. Hartmann, M. Hauschild, C. M. Hawkes, R. Hawkings, R. J. Hemingway, G. Herten, R. D. Heuer, M. D. Hildreth, J. C. Hill, S. J. Hillier, T. Hilse, J. Hoare, P. R. Hobson, R. J. Homer, A. K. Honma, D. Horváth, R. Howard, R. E. Hughes-Jones, D. E. Hutchcroft, P. Igo-Kemenes, D. C. Imrie, M. R. Ingram, A. Jawahery, P. W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, C. R. Jones, G. Jones, M. Jones, R. W.L. Jones, U. Jost, P. Jovanovic, T. R. Junk, D. Karlen, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, B. J. King, J. Kirk, S. Kluth, T. Kobayashi, M. Kobel, D. S. Koetke, T. P. Kokott, S. Komamiya, R. Kowalewski, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G. D. Lafferty, H. Lafoux, R. Lahmann, W. P. Lai, D. Lanske, J. Lauber, S. R. Lautenschlager, J. G. Layter, D. Lazic, A. M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, C. Lewis, S. L. Lloyd, F. K. Loebinger, G. D. Long, MJ Losty, J. Ludwig, A. Luig, A. Malik, M. Mannelli, S. Marcellini, C. Markus, A. J. Martin, J. P. Martin, G. Martinez, T. Mashimo, W. Matthews, P. Mättig, W. J. McDonald, J. McKenna, E. A. Mckigney, T. J. McMahon, A. I. McNab, R. A. McPherson, F. Meijers, S. Menke, F. S. Merritt, H. Mes, J. Meyer, A. Michelini, G. Mikenberg, D. J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, M. Morii, U. Müller, H. A. Neal, B. Nellen, B. Nijjhar, R. Nisius, S. W. O'Neale, F. G. Oakham, F. Odorici, H. O. Ogren, T. Omori, M. J. Oreglia, S. Orito, J. Pálinkás, J. P. Pansart, G. Pásztor, J. R. Pater, G. N. Patrick, M. J. Pearce, S. Petzold, P. Pfeifenschneider, J. E. Pilcher, J. Pinfold, D. E. Plane, P. Poffenberger, B. Poli, A. Posthaus, H. Przysiezniak, D. L. Rees, D. Rigby, S. A. Robins, N. Rodning, J. M. Roney, A. Rooke, E. Ros, A. M. Rossi, M. Rosvick, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, U. Ruppel, D. R. Rust, R. Rylko, E. K.G. Sarkisyan, M. Sasaki, C. Sbarra, A. D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, P. Schenk, B. Schmitt, S. Schmitt, M. Schroder, H. C. Schultz-Coulon, M. Schulz, P. Schütz, W. G. Scott, T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, G. P. Siroli, A. Sittler, A. Skillman, A. Skuja, A. M. Smith, T. J. Smith, G. A. Snow, R. Sobie, S. Söldner-Rembold, R. W. Springer, M. Sproston, A. Stahl, M. Starks, M. Steiert, K. Stephens, J. Steuerer, B. Stockhausen, D. Strom, F. Strumia, P. Szymanski, R. Tafirout, S. D. Talbot, S. Tanaka, P. Taras, S. Tarem, M. Tecchio, M. Thiergen, M. A. Thomson, E. von Törne, S. Towers, M. Tscheulin, T. Tsukamoto, E. Tsur, A. S. Turcot, M. F. Turner-Watson, P. Utzat, R. van Kooten, G. Vasseur, M. Verzocchi, P. Vikas, M. Vincter, E. H. Vokurka, F. Wäckerle, A. Wagner, C. P. Ward, D. R. Ward, J. J. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. Weber, P. S. Wells, N. Wermes, J. S. White, B. Wilkens, G. W. Wilson, J. A. Wilson, T. Wlodek, G. Wolf, S. Wotton, T. R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The spin composition of ΛΛ̄, ΛΛ and Λ̄Λ̄ 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 ΛΛ̄ 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 ΛΛ̄ 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 Λ̄Λ̄ pairs, well above threshold, is found to be similar to that of the ΛΛ̄ sample. A ΛΛ emitter dimension is estimated from the data assuming the onset of the Pauli exclusion principle near threshold.

Original language	English
Pages (from-to)	377-387
Number of pages	11
Journal	Physics Letters B
Volume	384
Issue number	1-4
DOIs	https://doi.org/10.1016/0370-2693(96)00860-X
State	Published - Sep 19 1996
Externally published	Yes

Funding

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’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.

Funders	Funder number
Bundesministeriumf ti Bildung, Wissenschaft, Forschungu nd TechnologieG
German Israeli Bi-national Science Foundation
HungarianF oundationfo r ScientificR esearchO	TKA F-015089, TKA T-016660
IsraelM inistry of Science, Israel ScienceF oundationa
JapaneseM inistry of EducationS, ciencea ndC ulture
MinervaG esellschaft
NationalR esearchC ouncil of Canada

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10.1016/0370-2693(96)00860-X

Cite this

Alexander, G., Allison, J., Altekamp, N., Ametewee, K., Anderson, KJ., Asai, S., Axen, D., Azuelos, G., Ball, A. H., Barberio, E., Barlow, R. J., Bartoldus, R., Batley, J. R., Beaudoin, G., Bechtluft, J., Beeston, C., Behnke, T., Bell, A. N., Bell, K. W., ... Zacek, V. (1996). A first measurement of the ΛΛ̄ and ΛΛ (Λ̄Λ̄) spin compositions in hadronic Z⁰ decays. Physics Letters B, 384(1-4), 377-387. https://doi.org/10.1016/0370-2693(96)00860-X

@article{8278734fa2b64d4ea454bc5532e96cb8,

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 = "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 M. Cuffiani and S. Dado and C. Dallapiccola and Dallavalle, {G. M.} and {de Jong}, S. and {del Pozo}, {L. A.} and K. Desch and Dixit, {M. S.} and {do Couto e Silva}, E. and M. Doucet and E. Duchovni and G. Duckeck and Duerdoth, {I. P.} and Edwards, {J. E.G.} and Estabrooks, {P. G.} and Evans, {H. G.} and M. Evans and F. Fabbri and P. Fath and F. Fiedler and M. Fierro and Fischer, {H. M.} and R. Folman and Fong, {D. G.} and M. Foucher and H. Fukui and A. F{\"u}rtjes and P. Gagnon and A. Gaidot and Gary, {J. W.} and J. Gascon and Gascon-Shotkin, {S. M.} and Geddes, {N. I.} and C. Geich-Gimbel and Gentit, {F. X.} and T. Geralis and G. Giacomelli and P. Giacomelli and R. Giacomelli and V. Gibson and Gibson, {W. R.} and Gingrich, {D. M.} and J. Goldberg and Goodrick, {M. J.} and W. Gorn and C. Grandi and E. Gross and M. Gruw{\'e} and C. Hajdu and Hanson, {G. G.} and M. Hansroul and M. Hapke and Hargrove, {C. K.} and Hart, {P. A.} and C. Hartmann and M. Hauschild and Hawkes, {C. M.} and R. Hawkings and Hemingway, {R. J.} and G. Herten and Heuer, {R. D.} and Hildreth, {M. D.} and Hill, {J. C.} and Hillier, {S. J.} and T. Hilse and J. Hoare and Hobson, {P. R.} and Homer, {R. J.} and Honma, {A. K.} and D. Horv{\'a}th and R. Howard and Hughes-Jones, {R. E.} and Hutchcroft, {D. E.} and P. Igo-Kemenes and Imrie, {D. C.} and Ingram, {M. R.} and A. Jawahery and Jeffreys, {P. W.} and H. Jeremie and M. Jimack and A. Joly and Jones, {C. R.} and G. Jones and M. Jones and Jones, {R. W.L.} and U. Jost and P. Jovanovic and Junk, {T. R.} and D. Karlen and K. Kawagoe and T. Kawamoto and Keeler, {R. K.} and Kellogg, {R. G.} and Kennedy, {B. W.} and King, {B. J.} and J. Kirk and S. Kluth and T. Kobayashi and M. Kobel and Koetke, {D. S.} and Kokott, {T. P.} and S. Komamiya and R. Kowalewski and T. Kress and P. Krieger and {von Krogh}, J. and P. Kyberd and Lafferty, {G. D.} and H. Lafoux and R. Lahmann and Lai, {W. P.} and D. Lanske and J. Lauber and Lautenschlager, {S. R.} and Layter, {J. G.} and D. Lazic and Lee, {A. M.} and E. Lefebvre and D. Lellouch and J. Letts and L. Levinson and C. Lewis and Lloyd, {S. L.} and Loebinger, {F. K.} and Long, {G. D.} and MJ Losty and J. Ludwig and A. Luig and A. Malik and M. Mannelli and S. Marcellini and C. Markus and Martin, {A. J.} and Martin, {J. P.} and G. Martinez and T. Mashimo and W. Matthews and P. M{\"a}ttig and McDonald, {W. J.} and J. McKenna and Mckigney, {E. A.} and McMahon, {T. J.} and McNab, {A. I.} and McPherson, {R. A.} and F. Meijers and S. Menke and Merritt, {F. S.} and H. Mes and J. Meyer and A. Michelini and G. Mikenberg and Miller, {D. J.} and R. Mir and W. Mohr and A. Montanari and T. Mori and M. Morii and U. M{\"u}ller and Neal, {H. A.} and B. Nellen and B. Nijjhar and R. Nisius and O'Neale, {S. W.} and Oakham, {F. G.} and F. Odorici and Ogren, {H. O.} and T. Omori and Oreglia, {M. J.} and S. Orito and J. P{\'a}link{\'a}s and Pansart, {J. P.} and G. P{\'a}sztor and Pater, {J. R.} and Patrick, {G. N.} and Pearce, {M. J.} and S. Petzold and P. Pfeifenschneider and Pilcher, {J. E.} and J. Pinfold and Plane, {D. E.} and P. Poffenberger and B. Poli and A. Posthaus and H. Przysiezniak and Rees, {D. L.} and D. Rigby and Robins, {S. A.} and N. Rodning and Roney, {J. M.} and A. Rooke and E. Ros and Rossi, {A. M.} and M. Rosvick and P. Routenburg and Y. Rozen and K. Runge and O. Runolfsson and U. Ruppel and Rust, {D. R.} and R. Rylko and Sarkisyan, {E. K.G.} and M. Sasaki and C. Sbarra and Schaile, {A. D.} and O. Schaile and F. Scharf and P. Scharff-Hansen and P. Schenk and B. Schmitt and S. Schmitt and M. Schroder and Schultz-Coulon, {H. C.} and M. Schulz and P. Sch{\"u}tz and Scott, {W. G.} and Shears, {T. G.} and Shen, {B. C.} and Shepherd-Themistocleous, {C. H.} and P. Sherwood and Siroli, {G. P.} and A. Sittler and A. Skillman and A. Skuja and Smith, {A. M.} and Smith, {T. J.} and Snow, {G. A.} and R. Sobie and S. S{\"o}ldner-Rembold and Springer, {R. W.} and M. Sproston and A. Stahl and M. Starks and M. Steiert and K. Stephens and J. Steuerer and B. Stockhausen and D. Strom and F. Strumia and P. Szymanski and R. Tafirout and Talbot, {S. D.} and S. Tanaka and P. Taras and S. Tarem and M. Tecchio and M. Thiergen and Thomson, {M. A.} and {von T{\"o}rne}, E. and S. Towers and M. Tscheulin and T. Tsukamoto and E. Tsur and Turcot, {A. S.} and Turner-Watson, {M. F.} and P. Utzat and {van Kooten}, R. and G. Vasseur and M. Verzocchi and P. Vikas and M. Vincter and Vokurka, {E. H.} and F. W{\"a}ckerle and A. Wagner and Ward, {C. P.} and Ward, {D. R.} and Ward, {J. J.} and Watkins, {P. M.} and Watson, {A. T.} and Watson, {N. K.} and P. Weber and Wells, {P. S.} and N. Wermes and White, {J. S.} and B. Wilkens and Wilson, {G. W.} and Wilson, {J. A.} and T. Wlodek and G. Wolf and S. Wotton and Wyatt, {T. R.} and S. Yamashita and G. Yekutieli and V. Zacek",

year = "1996",

month = sep,

day = "19",

doi = "10.1016/0370-2693(96)00860-X",

language = "English",

volume = "384",

pages = "377--387",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-4",

}

Alexander, G, Allison, J, Altekamp, N, Ametewee, K, Anderson, KJ, Asai, S, Axen, D, Azuelos, G, Ball, AH, Barberio, E, Barlow, RJ, Bartoldus, R, Batley, JR, Beaudoin, G, Bechtluft, J, Beeston, C, Behnke, T, Bell, AN, Bell, KW, Bella, G, Bentvelsen, S, Berlich, P, Bethke, S, Biebel, O, Blobel, V, Bloodworth, IJ, Bloomer, JE, Bock, P, Bosch, HM, Boutemeur, M, Bouwens, BT, Braibant, S, Brown, RM, Burckhart, HJ, Burgard, C, Bürgin, R, Capiluppi, P, Carnegie, RK, Carter, AA, Carter, JR, Chang, CY, Charlesworth, C, Charlton, DG, Chrisman, D, Chu, SL, Clarke, PEL, Cohen, I, Conboy, JE, Cooke, OC, Cuffiani, M, Dado, S, Dallapiccola, C, Dallavalle, GM, de Jong, S, del Pozo, LA, Desch, K, Dixit, MS, do Couto e Silva, E, Doucet, M, Duchovni, E, Duckeck, G, Duerdoth, IP, Edwards, JEG, Estabrooks, PG, Evans, HG, Evans, M, Fabbri, F, Fath, P, Fiedler, F, Fierro, M, Fischer, HM, Folman, R, Fong, DG, Foucher, M, Fukui, H, Fürtjes, A, Gagnon, P, Gaidot, A, Gary, JW, Gascon, J, Gascon-Shotkin, SM, Geddes, NI, Geich-Gimbel, C, Gentit, FX, Geralis, T, Giacomelli, G, Giacomelli, P, Giacomelli, R, Gibson, V, Gibson, WR, Gingrich, DM, Goldberg, J, Goodrick, MJ, Gorn, W, Grandi, C, Gross, E, Gruwé, M, Hajdu, C, Hanson, GG, Hansroul, M, Hapke, M, Hargrove, CK, Hart, PA, Hartmann, C, Hauschild, M, Hawkes, CM, Hawkings, R, Hemingway, RJ, Herten, G, Heuer, RD, Hildreth, MD, Hill, JC, Hillier, SJ, Hilse, T, Hoare, J, Hobson, PR, Homer, RJ, Honma, AK, Horváth, D, Howard, R, Hughes-Jones, RE, Hutchcroft, DE, Igo-Kemenes, P, Imrie, DC, Ingram, MR, Jawahery, A, Jeffreys, PW, Jeremie, H, Jimack, M, Joly, A, Jones, CR, Jones, G, Jones, M, Jones, RWL, Jost, U, Jovanovic, P, Junk, TR, Karlen, D, Kawagoe, K, Kawamoto, T, Keeler, RK, Kellogg, RG, Kennedy, BW, King, BJ, Kirk, J, Kluth, S, Kobayashi, T, Kobel, M, Koetke, DS, Kokott, TP, Komamiya, S, Kowalewski, R, Kress, T, Krieger, P, von Krogh, J, Kyberd, P, Lafferty, GD, Lafoux, H, Lahmann, R, Lai, WP, Lanske, D, Lauber, J, Lautenschlager, SR, Layter, JG, Lazic, D, Lee, AM, Lefebvre, E, Lellouch, D, Letts, J, Levinson, L, Lewis, C, Lloyd, SL, Loebinger, FK, Long, GD, Losty, MJ, Ludwig, J, Luig, A, Malik, A, Mannelli, M, Marcellini, S, Markus, C, Martin, AJ, Martin, JP, Martinez, G, Mashimo, T, Matthews, W, Mättig, P, McDonald, WJ, McKenna, J, Mckigney, EA, McMahon, TJ, McNab, AI, McPherson, RA, Meijers, F, Menke, S, Merritt, FS, Mes, H, Meyer, J, Michelini, A, Mikenberg, G, Miller, DJ, Mir, R, Mohr, W, Montanari, A, Mori, T, Morii, M, Müller, U, Neal, HA, Nellen, B, Nijjhar, B, Nisius, R, O'Neale, SW, Oakham, FG, Odorici, F, Ogren, HO, Omori, T, Oreglia, MJ, Orito, S, Pálinkás, J, Pansart, JP, Pásztor, G, Pater, JR, Patrick, GN, Pearce, MJ, Petzold, S, Pfeifenschneider, P, Pilcher, JE, Pinfold, J, Plane, DE, Poffenberger, P, Poli, B, Posthaus, A, Przysiezniak, H, Rees, DL, Rigby, D, Robins, SA, Rodning, N, Roney, JM, Rooke, A, Ros, E, Rossi, AM, Rosvick, M, Routenburg, P, Rozen, Y, Runge, K, Runolfsson, O, Ruppel, U, Rust, DR, Rylko, R, Sarkisyan, EKG, Sasaki, M, Sbarra, C, Schaile, AD, Schaile, O, Scharf, F, Scharff-Hansen, P, Schenk, P, Schmitt, B, Schmitt, S, Schroder, M, Schultz-Coulon, HC, Schulz, M, Schütz, P, Scott, WG, Shears, TG, Shen, BC, Shepherd-Themistocleous, CH, Sherwood, P, Siroli, GP, Sittler, A, Skillman, A, Skuja, A, Smith, AM, Smith, TJ, Snow, GA, Sobie, R, Söldner-Rembold, S, Springer, RW, Sproston, M, Stahl, A, Starks, M, Steiert, M, Stephens, K, Steuerer, J, Stockhausen, B, Strom, D, Strumia, F, Szymanski, P, Tafirout, R, Talbot, SD, Tanaka, S, Taras, P, Tarem, S, Tecchio, M, Thiergen, M, Thomson, MA, von Törne, E, Towers, S, Tscheulin, M, Tsukamoto, T, Tsur, E, Turcot, AS, Turner-Watson, MF, Utzat, P, van Kooten, R, Vasseur, G, Verzocchi, M, Vikas, P, Vincter, M, Vokurka, EH, Wäckerle, F, Wagner, A, Ward, CP, Ward, DR, Ward, JJ, Watkins, PM, Watson, AT, Watson, NK, Weber, P, Wells, PS, Wermes, N, White, JS, Wilkens, B, Wilson, GW, Wilson, JA, Wlodek, T, Wolf, G, Wotton, S, Wyatt, TR, Yamashita, S, Yekutieli, G & Zacek, V 1996, 'A first measurement of the ΛΛ̄ and ΛΛ (Λ̄Λ̄) spin compositions in hadronic Z⁰ decays', Physics Letters B, vol. 384, no. 1-4, pp. 377-387. https://doi.org/10.1016/0370-2693(96)00860-X

TY - JOUR

T1 - A first measurement of the ΛΛ̄ and ΛΛ (Λ̄Λ̄) spin compositions in hadronic Z0 decays

AU - Alexander, G.

AU - Allison, J.

AU - Altekamp, N.

AU - Ametewee, K.

AU - Anderson, KJ

AU - Asai, S.

AU - Axen, D.

AU - Azuelos, G.

AU - Ball, A. H.

AU - Barberio, E.

AU - Barlow, R. J.

AU - Bartoldus, R.

AU - Batley, J. R.

AU - Beaudoin, G.

AU - Bechtluft, J.

AU - Beeston, C.

AU - Behnke, T.

AU - Bell, A. N.

AU - Bell, K. W.

AU - Bella, G.

AU - Bentvelsen, S.

AU - Berlich, P.

AU - Bethke, S.

AU - Biebel, O.

AU - Blobel, V.

AU - Bloodworth, I. J.

AU - Bloomer, J. E.

AU - Bock, P.

AU - Bosch, H. M.

AU - Boutemeur, M.

AU - Bouwens, B. T.

AU - Braibant, S.

AU - Brown, R. M.

AU - Burckhart, H. J.

AU - Burgard, C.

AU - Bürgin, R.

AU - Capiluppi, P.

AU - Carnegie, R. K.

AU - Carter, A. A.

AU - Carter, J. R.

AU - Chang, C. Y.

AU - Charlesworth, C.

AU - Charlton, D. G.

AU - Chrisman, D.

AU - Chu, S. L.

AU - Clarke, P. E.L.

AU - Cohen, I.

AU - Conboy, J. E.

AU - Cooke, O. C.

AU - Cuffiani, M.

AU - Dado, S.

AU - Dallapiccola, C.

AU - Dallavalle, G. M.

AU - de Jong, S.

AU - del Pozo, L. A.

AU - Desch, K.

AU - Dixit, M. S.

AU - do Couto e Silva, E.

AU - Doucet, M.

AU - Duchovni, E.

AU - Duckeck, G.

AU - Duerdoth, I. P.

AU - Edwards, J. E.G.

AU - Estabrooks, P. G.

AU - Evans, H. G.

AU - Evans, M.

AU - Fabbri, F.

AU - Fath, P.

AU - Fiedler, F.

AU - Fierro, M.

AU - Fischer, H. M.

AU - Folman, R.

AU - Fong, D. G.

AU - Foucher, M.

AU - Fukui, H.

AU - Fürtjes, A.

AU - Gagnon, P.

AU - Gaidot, A.

AU - Gary, J. W.

AU - Gascon, J.

AU - Gascon-Shotkin, S. M.

AU - Geddes, N. I.

AU - Geich-Gimbel, C.

AU - Gentit, F. X.

AU - Geralis, T.

AU - Giacomelli, G.

AU - Giacomelli, P.

AU - Giacomelli, R.

AU - Gibson, V.

AU - Gibson, W. R.

AU - Gingrich, D. M.

AU - Goldberg, J.

AU - Goodrick, M. J.

AU - Gorn, W.

AU - Grandi, C.

AU - Gross, E.

AU - Gruwé, M.

AU - Hajdu, C.

AU - Hanson, G. G.

AU - Hansroul, M.

AU - Hapke, M.

AU - Hargrove, C. K.

AU - Hart, P. A.

AU - Hartmann, C.

AU - Hauschild, M.

AU - Hawkes, C. M.

AU - Hawkings, R.

AU - Hemingway, R. J.

AU - Herten, G.

AU - Heuer, R. D.

AU - Hildreth, M. D.

AU - Hill, J. C.

AU - Hillier, S. J.

AU - Hilse, T.

AU - Hoare, J.

AU - Hobson, P. R.

AU - Homer, R. J.

AU - Honma, A. K.

AU - Horváth, D.

AU - Howard, R.

AU - Hughes-Jones, R. E.

AU - Hutchcroft, D. E.

AU - Igo-Kemenes, P.

AU - Imrie, D. C.

AU - Ingram, M. R.

AU - Jawahery, A.

AU - Jeffreys, P. W.

AU - Jeremie, H.

AU - Jimack, M.

AU - Joly, A.

AU - Jones, C. R.

AU - Jones, G.

AU - Jones, M.

AU - Jones, R. W.L.

AU - Jost, U.

AU - Jovanovic, P.

AU - Junk, T. R.

AU - Karlen, D.

AU - Kawagoe, K.

AU - Kawamoto, T.

AU - Keeler, R. K.

AU - Kellogg, R. G.

AU - Kennedy, B. W.

AU - King, B. J.

AU - Kirk, J.

AU - Kluth, S.

AU - Kobayashi, T.

AU - Kobel, M.

AU - Koetke, D. S.

AU - Kokott, T. P.

AU - Komamiya, S.

AU - Kowalewski, R.

AU - Kress, T.

AU - Krieger, P.

AU - von Krogh, J.

AU - Kyberd, P.

AU - Lafferty, G. D.

AU - Lafoux, H.

AU - Lahmann, R.

AU - Lai, W. P.

AU - Lanske, D.

AU - Lauber, J.

AU - Lautenschlager, S. R.

AU - Layter, J. G.

AU - Lazic, D.

AU - Lee, A. M.

AU - Lefebvre, E.

AU - Lellouch, D.

AU - Letts, J.

AU - Levinson, L.

AU - Lewis, C.

AU - Lloyd, S. L.

AU - Loebinger, F. K.

AU - Long, G. D.

AU - Losty, MJ

AU - Ludwig, J.

AU - Luig, A.

AU - Malik, A.

AU - Mannelli, M.

AU - Marcellini, S.

AU - Markus, C.

AU - Martin, A. J.

AU - Martin, J. P.

AU - Martinez, G.

AU - Mashimo, T.

AU - Matthews, W.

AU - Mättig, P.

AU - McDonald, W. J.

AU - McKenna, J.

AU - Mckigney, E. A.

AU - McMahon, T. J.

AU - McNab, A. I.

AU - McPherson, R. A.

AU - Meijers, F.

AU - Menke, S.

AU - Merritt, F. S.

AU - Mes, H.

AU - Meyer, J.

AU - Michelini, A.

AU - Mikenberg, G.

AU - Miller, D. J.

AU - Mir, R.

AU - Mohr, W.

AU - Montanari, A.

AU - Mori, T.

AU - Morii, M.

AU - Müller, U.

AU - Neal, H. A.

AU - Nellen, B.

AU - Nijjhar, B.

AU - Nisius, R.

AU - O'Neale, S. W.

AU - Oakham, F. G.

AU - Odorici, F.

AU - Ogren, H. O.

AU - Omori, T.

AU - Oreglia, M. J.

AU - Orito, S.

AU - Pálinkás, J.

AU - Pansart, J. P.

AU - Pásztor, G.

AU - Pater, J. R.

AU - Patrick, G. N.

AU - Pearce, M. J.

AU - Petzold, S.

AU - Pfeifenschneider, P.

AU - Pilcher, J. E.

AU - Pinfold, J.

AU - Plane, D. E.

AU - Poffenberger, P.

AU - Poli, B.

AU - Posthaus, A.

AU - Przysiezniak, H.

AU - Rees, D. L.

AU - Rigby, D.

AU - Robins, S. A.

AU - Rodning, N.

AU - Roney, J. M.

AU - Rooke, A.

AU - Ros, E.

AU - Rossi, A. M.

AU - Rosvick, M.

AU - Routenburg, P.

AU - Rozen, Y.

AU - Runge, K.

AU - Runolfsson, O.

AU - Ruppel, U.

AU - Rust, D. R.

AU - Rylko, R.

AU - Sarkisyan, E. K.G.

AU - Sasaki, M.

AU - Sbarra, C.

AU - Schaile, A. D.

AU - Schaile, O.

AU - Scharf, F.

AU - Scharff-Hansen, P.

AU - Schenk, P.

AU - Schmitt, B.

AU - Schmitt, S.

AU - Schroder, M.

AU - Schultz-Coulon, H. C.

AU - Schulz, M.

AU - Schütz, P.

AU - Scott, W. G.

AU - Shears, T. G.

AU - Shen, B. C.

AU - Shepherd-Themistocleous, C. H.

AU - Sherwood, P.

AU - Siroli, G. P.

AU - Sittler, A.

AU - Skillman, A.

AU - Skuja, A.

AU - Smith, A. M.

AU - Smith, T. J.

AU - Snow, G. A.

AU - Sobie, R.

AU - Söldner-Rembold, S.

AU - Springer, R. W.

AU - Sproston, M.

AU - Stahl, A.

AU - Starks, M.

AU - Steiert, M.

AU - Stephens, K.

AU - Steuerer, J.

AU - Stockhausen, B.

AU - Strom, D.

AU - Strumia, F.

AU - Szymanski, P.

AU - Tafirout, R.

AU - Talbot, S. D.

AU - Tanaka, S.

AU - Taras, P.

AU - Tarem, S.

AU - Tecchio, M.

AU - Thiergen, M.

AU - Thomson, M. A.

AU - von Törne, E.

AU - Towers, S.

AU - Tscheulin, M.

AU - Tsukamoto, T.

AU - Tsur, E.

AU - Turcot, A. S.

AU - Turner-Watson, M. F.

AU - Utzat, P.

AU - van Kooten, R.

AU - Vasseur, G.

AU - Verzocchi, M.

AU - Vikas, P.

AU - Vincter, M.

AU - Vokurka, E. H.

AU - Wäckerle, F.

AU - Wagner, A.

AU - Ward, C. P.

AU - Ward, D. R.

AU - Ward, J. J.

AU - Watkins, P. M.

AU - Watson, A. T.

AU - Watson, N. K.

AU - Weber, P.

AU - Wells, P. S.

AU - Wermes, N.

AU - White, J. S.

AU - Wilkens, B.

AU - Wilson, G. W.

AU - Wilson, J. A.

AU - Wlodek, T.

AU - Wolf, G.

AU - Wotton, S.

AU - Wyatt, T. R.

AU - Yamashita, S.

AU - Yekutieli, G.

AU - Zacek, V.

PY - 1996/9/19

Y1 - 1996/9/19

N2 - The spin composition of ΛΛ̄, ΛΛ and Λ̄Λ̄ 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 ΛΛ̄ 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 ΛΛ̄ 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 Λ̄Λ̄ pairs, well above threshold, is found to be similar to that of the ΛΛ̄ sample. A ΛΛ emitter dimension is estimated from the data assuming the onset of the Pauli exclusion principle near threshold.

AB - The spin composition of ΛΛ̄, ΛΛ and Λ̄Λ̄ 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 ΛΛ̄ 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 ΛΛ̄ 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 Λ̄Λ̄ pairs, well above threshold, is found to be similar to that of the ΛΛ̄ sample. A ΛΛ emitter dimension is estimated from the data assuming the onset of the Pauli exclusion principle near threshold.

UR - http://www.scopus.com/inward/record.url?scp=0042094473&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(96)00860-X

DO - 10.1016/0370-2693(96)00860-X

M3 - Article

AN - SCOPUS:0042094473

SN - 0370-2693

VL - 384

SP - 377

EP - 387

JO - Physics Letters B

JF - Physics Letters B

IS - 1-4

ER -

A first measurement of the ΛΛ̄ and ΛΛ (Λ̄Λ̄) spin compositions in hadronic Z⁰ decays

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