CERN Accelerating science

Article
Report number arXiv:0910.2174 ; CERN-PH-EP-2009-013 ; CERN-PH-EP-2009-013
Title $\Sigma$-antihyperon correlations in $Z^{0}$ decay and investigation of the baryon production mechanism
Author(s)

Abbiendi, G. (Bologna U. ; INFN, Bologna) ; Ainsley, C. (Cambridge U.) ; Akesson, P.F. (CERN) ; Alexander, G. (Tel Aviv U.) ; Anagnostou, G. (Birmingham U.) ; Anderson, K.J. (Chicago U., EFI) ; Asai, S. (Tokyo U., ICEPP ; Kobe U.) ; Axen, D. (British Columbia U.) ; Bailey, I. (Victoria U.) ; Barberio, E. (CERN) ; Barillari, T. (Munich, Max Planck Inst.) ; Barlow, R.J. (Manchester U.) ; Batley, R.J. (Cambridge U.) ; Bechtle, P. (Hamburg U. ; DESY) ; Behnke, T. (Hamburg U. ; DESY) ; Bell, K.W. (Rutherford) ; Bell, P.J. (Birmingham U.) ; Bella, G. (Tel Aviv U.) ; Bellerive, A. (Ottawa Carleton Inst. Phys. ; Carleton U.) ; Benelli, G. (UC, Riverside) ; Bethke, S. (Munich, Max Planck Inst.) ; Biebel, O. (Munich U.) ; Boeriu, O. (Freiburg U.) ; Bock, P. (Heidelberg U.) ; Boutemeur, M. (Munich U.) ; Braibant, S. (Bologna U. ; INFN, Bologna) ; Brown, R.M. (Rutherford) ; Burckhart, H.J. (CERN) ; Campana, S. (UC, Riverside) ; Capiluppi, P. (Bologna U. ; INFN, Bologna) ; Carnegie, R.K. (Ottawa Carleton Inst. Phys. ; Carleton U.) ; Carter, A.A. (Queen Mary, U. of London) ; Carter, J.R. (Cambridge U.) ; Chang, C.Y. (Maryland U.) ; Charlton, D.G. (Birmingham U.) ; Ciocca, C. (Bologna U. ; INFN, Bologna) ; Csilling, A. (Budapest, RMKI) ; Cuffiani, M. (Bologna U. ; INFN, Bologna) ; Dado, S. (Technion) ; Dallavalle, M. (Bologna U. ; INFN, Bologna) ; de Roeck, A. (CERN) ; De Wolf, E.A. (CERN) ; Desch, K. (Hamburg U. ; DESY) ; Dienes, B. (Debrecen, Inst. Nucl. Res.) ; Dubbert, J. (Munich U.) ; Duchovni, E. (Weizmann Inst.) ; Duckeck, G. (Munich U.) ; Duerdoth, I.P. (Manchester U.) ; Etzion, E. (Tel Aviv U.) ; Fabbri, F. (Bologna U. ; INFN, Bologna) ; Ferrari, P. (CERN) ; Fiedler, F. (Munich U.) ; Fleck, I. (Freiburg U.) ; Ford, M. (Manchester U.) ; Frey, A. (CERN) ; Gagnon, P. (Indiana U.) ; Gary, J.W. (UC, Riverside) ; Geich-Gimbel, C. (Bonn U.) ; Giacomelli, G. (Bologna U. ; INFN, Bologna) ; Giacomelli, P. (Bologna U. ; INFN, Bologna) ; Giunta, M. (UC, Riverside) ; Goldberg, J. (Technion) ; Gross, E. (Weizmann Inst.) ; Grunhaus, J. (Tel Aviv U.) ; Gruwe, M. (CERN) ; Gupta, A. (Chicago U., EFI) ; Hajdu, C. (Budapest, RMKI) ; Hamann, M. (Hamburg U. ; DESY) ; Hanson, G.G. (UC, Riverside) ; Harel, A. (Technion) ; Hauschild, M. (CERN) ; Hawkes, C.M. (Birmingham U.) ; Hawkings, R. (CERN) ; Herten, G. (Freiburg U.) ; Heuer, R.D. (Hamburg U. ; DESY) ; Hill, J.C. (Cambridge U.) ; Horvath, D. (Budapest, RMKI ; Debrecen, Inst. Nucl. Res.) ; Igo-Kemenes, P. (Tokyo U., ICEPP ; Kobe U.) ; Ishii, K. (Tokyo U., ICEPP ; Kobe U.) ; Jeremie, H. (Montreal U.) ; Jovanovic, P. (Birmingham U.) ; Junk, T.R. (Ottawa Carleton Inst. Phys. ; Carleton U.) ; Kanzaki, J. (Tokyo U., ICEPP ; Kobe U. ; KEK, Tsukuba) ; Karlen, D. (Victoria U.) ; Kawagoe, K. (Tokyo U., ICEPP ; Kobe U.) ; Kawamoto, T. (Tokyo U., ICEPP ; Kobe U.) ; Keeler, R.K. (Victoria U.) ; Kellogg, R.G. (Maryland U.) ; Kennedy, B.W. (Rutherford) ; Kluth, S. (Munich, Max Planck Inst.) ; Kobayashi, T. (Tokyo U., ICEPP ; Kobe U.) ; Kobel, M. (Bonn U.) ; Komamiya, S. (Tokyo U., ICEPP ; Kobe U.) ; Kramer, T. (Hamburg U. ; DESY) ; Krasznahorkay, A., Jr. (Debrecen, Inst. Nucl. Res. ; U. Debrecen, Inst. Phys.) ; Krieger, P. (Ottawa Carleton Inst. Phys. ; Carleton U.) ; von Krogh, J. (Heidelberg U.) ; Kuhl, T. (Hamburg U. ; DESY) ; Kupper, M. (Weizmann Inst.) ; Lafferty, G.D. (Manchester U.) ; Landsman, H. (Technion) ; Lanske, D. (Aachen, Tech. Hochsch.) ; Lellouch, D. (Weizmann Inst.) ; Letts, J. (Weizmann Inst.) ; Levinson, L. (Weizmann Inst.) ; Lillich, J. (Freiburg U.) ; Lloyd, S.L. (Queen Mary, U. of London) ; Loebinger, F.K. (Manchester U.) ; Lu, J. (British Columbia U.) ; Ludwig, A. (Bonn U.) ; Ludwig, J. (Freiburg U.) ; Mader, W. (Bonn U.) ; Marcellini, S. (Bologna U. ; INFN, Bologna) ; Martin, A.J. (Queen Mary, U. of London) ; Mashimo, T. (Tokyo U., ICEPP ; Kobe U.) ; Mattig, P. (British Columbia U.) ; McKenna, J. (British Columbia U.) ; McPherson, R.A. (Victoria U.) ; Meijers, F. (CERN) ; Menges, W. (Hamburg U. ; DESY) ; Merritt, F.S. (Chicago U., EFI) ; Mes, H. (Ottawa Carleton Inst. Phys. ; Carleton U. ; TRIUMF) ; Meyer, N. (Hamburg U. ; DESY) ; Michelini, A. (Bologna U. ; INFN, Bologna) ; Mihara, S. (Tokyo U., ICEPP ; Kobe U.) ; Mikenberg, G. (Weizmann Inst.) ; Miller, D.J. (University Coll. London) ; Mohr, W. (Freiburg U.) ; Mori, T. (Tokyo U., ICEPP ; Kobe U.) ; Mutter, A. (Freiburg U.) ; Nagai, K. (Queen Mary, U. of London) ; Nakamura, I. (Tokyo U., ICEPP ; Kobe U.) ; Nanjo, H. (Tokyo U., ICEPP ; Kobe U.) ; Neal, H.A. (Yale U.) ; O'Neale, S.W. (Birmingham U.) ; Oh, A. (CERN) ; Oreglia, M.J. (Chicago U., EFI) ; Orito, S. (Tokyo U., ICEPP ; Kobe U.) ; Pahl, C. (Munich, Max Planck Inst.) ; Pasztor, G. (UC, Riverside ; Budapest, RMKI) ; Pater, J.R. (Manchester U.) ; Pilcher, J.E. (Chicago U., EFI) ; Pinfold, J. (Alberta U.) ; Plane, D.E. (CERN) ; Pooth, O. (Aachen, Tech. Hochsch.) ; Przybycien, M. (CERN) ; Quadt, A. (Munich, Max Planck Inst.) ; Rabbertz, K. (CERN) ; Rembser, C. (CERN) ; Renkel, P. (Weizmann Inst.) ; Roney, J.M. (Victoria U.) ; Rossi, A.M. (Bologna U. ; INFN, Bologna) ; Rozen, Y. (Technion) ; Runge, K. (Freiburg U.) ; Sachs, K. (Ottawa Carleton Inst. Phys. ; Carleton U.) ; Saeki, T. (Tokyo U., ICEPP ; Kobe U.) ; Sarkisyan, E.K.G. (CERN) ; Schaile, A.D. (Munich U.) ; Schaile, O. (Munich U.) ; Scharff-Hansen, P. (CERN) ; Schieck, J. (Munich, Max Planck Inst.) ; Schorner-Sadenius, T. (CERN) ; Schroder, M. (CERN) ; Schumacher, M. (Bonn U.) ; Seuster, R. (Aachen, Tech. Hochsch. ; Munich, Max Planck Inst.) ; Shears, T.G. (CERN) ; Shen, B.C. (UC, Riverside) ; Sherwood, P. (University Coll. London) ; Skuja, A. (Maryland U.) ; Smith, A.M. (CERN) ; Sobie, R. (Victoria U.) ; Soldner-Rembold, S. (Manchester U.) ; Spano, F. (Chicago U., EFI) ; Stahl, A. (Aachen, Tech. Hochsch.) ; Strom, D. (Oregon U.) ; Strohmer, R. (Munich U.) ; Tarem, S. (Technion) ; Tasevsky, M. (CERN) ; Teuscher, R. (Chicago U., EFI) ; Thomson, M.A. (Cambridge U.) ; Torrence, E. (Oregon U.) ; Toya, D. (Tokyo U., ICEPP ; Kobe U.) ; Trigger, I. (CERN) ; Trocsanyi, Z. (Debrecen, Inst. Nucl. Res. ; U. Debrecen, Inst. Phys.) ; Tsur, E. (Tel Aviv U.) ; Turner-Watson, M.F. (Birmingham U.) ; Ueda, I. (Tokyo U., ICEPP ; Kobe U.) ; Ujvari, B. (Debrecen, Inst. Nucl. Res. ; U. Debrecen, Inst. Phys.) ; Vollmer, C.F. (Munich U.) ; Vannerem, P. (Freiburg U.) ; Vertesi, R. (Debrecen, Inst. Nucl. Res. ; U. Debrecen, Inst. Phys.) ; Verzocchi, M. (Maryland U.) ; Voss, H. (CERN) ; Vossebeld, J. (CERN) ; Ward, C.P. (Cambridge U.) ; Ward, D.R. (Cambridge U.) ; Watkins, P.M. (Birmingham U.) ; Watson, A.T. (Birmingham U.) ; Watson, N.K. (Birmingham U.) ; Wells, P.S. (CERN) ; Wengler, T. (CERN) ; Wermes, N. (Bonn U.) ; Wetterling, D. (Heidelberg U.) ; Wilson, G.W. (Manchester U.) ; Wilson, J.A. (Birmingham U.) ; Wolf, G. (Weizmann Inst.) ; Wyatt, T.R. (Manchester U.) ; Yamashita, S. (Tokyo U., ICEPP ; Kobe U.) ; Zer-Zion, D. (UC, Riverside) ; Zivkovic, L. (Technion)

Publication 2009
Imprint 13 Oct 2009
Number of pages 32
Note Comments: No of pages 31 - No of figures 7
In: Eur. Phys. J. C 64 (2009) 609-625
DOI 10.1140/epjc/s10052-009-1175-z
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract Data collected around sqrt{s}=91 GeV by the OPAL experiment at the LEP e+e- collider are used to study the mechanism of baryon formation. As the signature, the fraction of Sigma-hyperons whose baryon number is compensated by the production of a Sigma-, Lambda or Xi- antihyperon is determined. The method relies entirely on quantum number correlations of the baryons, and not rapidity correlations, making it more model independent than previous studies. The diquark fragmentation model without the popcorn mechanism is strongly disfavored with a significance of 3.8 standard deviations including systematic uncertainties. It is shown that previous studies of the popcorn mechanism are not conclusive if parameter uncertainties are considered.
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