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Sigma(-)-antihyperon correlations in Z(0) decay and investigation of the baryon production mechanism.

Abbiendi, G. and Ainsley, C. and Akesson, P. F. and Alexander, G. and Anagnostou, G. and Anderson, K. J. and Asai, S. and Axen, D. and Bailey, I. and Barberio, E. and Barillari, T. and Barlow, R. J. and Batley, R. J. and Bechtle, P. and Behnke, T. and Bell, K. W. and Bell, P. J. and Bella, G. and Bellerive, A. and Benelli, G. and Bethke, S. and Biebel, O. and Boeriu, O. and Bock, P. and Boutemeur, M. and Braibant, S. and Brown, R. M. and Burckhart, H. J. and Campana, S. and Capiluppi, P. and Carnegie, R. K. and Carter, A. A. and Carter, J. R. and Chang, C. Y. and Charlton, D. G. and Ciocca, C. and Csilling, A. and Cuffiani, M. and Dado, S. and Dallavalle, M. and De Roeck, A. and De Wolf, E. A. and Desch, K. and Dienes, B. and Dubbert, J. and Duchovni, E. and Duckeck, G. and Duerdoth, I. P. and Etzion, E. and Fabbri, F. and Ferrari, P. and Fiedler, F. and Fleck, I. and Ford, M. and Frey, A. and Gagnon, P. and Gary, J. W. and Geich-Gimbel, C. and Giacomelli, G. and Giacomelli, P. and Giunta, M. and Goldberg, J. and Gross, E. and Grunhaus, J. and Gruwe, M. and Gupta, A. and Hajdu, C. and Hamann, M. and Hanson, G. G. and Harel, A. and Hauschild, M. and Hawkes, C. M. and Hawkings, R. and Herten, G. and Heuer, R. D. and Hill, J. C. and Horvath, D. and Igo-Kemenes, P. and Ishii, K. and Jeremie, H. and Jovanovic, P. and Junk, T. R. and Kanzaki, J. and Karlen, D. and Kawagoe, K. and Kawamoto, T. and Keeler, R. K. and Kellogg, R. G. and Kennedy, B. W. and Kluth, S. and Kobayashi, T. and Kobel, M. and Komamiya, S. and Kraemer, T. and Krasznahorkay, A. and Krieger, P. and vonKrogh, J. and Kuhl, T. and Kupper, M. and Lafferty, G. D. and Landsman, H. and Lanske, D. and Lellouch, D. and Letts, J. and Levinson, L. and Lillich, J. and Lloyd, S. L. and Loebinger, F. K. and Lu, J. and Ludwig, A. and Ludwig, J. and Mader, W. and Marcellini, S. and Martin, A. J. and Mashimo, T. and Maettig, P. and McKenna, J. and McPherson, R. A. and Meijers, F. and Menges, W. and Merritt, F. S. and Mes, H. and Meyer, N. and Michelini, A. and Mihara, S. and Mikenberg, G. and Miller, D. J. and Mohr, W. and Mori, T. and Mutter, A. and Nagai, K. and Nakamura, I. and Nanjo, H. and Neal, H. A. and O'Neale, S. W. and Oh, A. and Oreglia, M. J. and Orito, S. and Pahl, C. and Pasztor, G. and Pater, J. R. and Pilcher, J. E. and Pinfold, J. and Plane, D. E. and Pooth, O. and Przybycien, M. and Quadt, A. and Rabbertz, K. and Rembser, C. and Renkel, P. and Roney, J. M. and Rossi, A. M. and Rozen, Y. and Runge, K. and Sachs, K. and Saeki, T. and Sarkisyan, E. K. G. and Schaile, A. D. and Schaile, O. and Scharff-Hansen, P. and Schieck, J. and Schoerner-Sadenius, T. and Schroeder, M. and Schumacher, M. and Seuster, R. and Shears, T. G. and Shen, B. C. and Sherwood, P. and Skuja, A. and Smith, A. M. and Sobie, R. and Soeldner-Rembold, S. and Spano, F. and Stahl, A. and Strom, D. and Stroehmer, R. and Tarem, S. and Tasevsky, M. and Teuscher, R. and Thomson, M. A. and Torrence, E. and Toya, D. and Trigger, I. and Trocsanyi, Z. and Tsur, E. and Turner-Watson, M. F. and Ueda, I. and Ujvari, B. and Vollmer, C. F. and Vannerem, P. and Vertesi, R. and Verzocchi, M. and Voss, H. and Vossebeld, J. and Ward, C. P. and Ward, D. R. and Watkins, P. M. and Watson, A. T. and Watson, N. K. and Wells, P. S. and Wengler, T. and Wermes, N. and Wetterling, D. and Wilson, G. W. and Wilson, J. A. and Wolf, G. and Wyatt, T. R. and Yamashita, S. and Zer-Zion, D. and Zivkovic, L. and Collaboration, OPAL (2009) Sigma(-)-antihyperon correlations in Z(0) decay and investigation of the baryon production mechanism. European Physical Journal C: Particles and Fields, 64 (4). pp. 609-625. ISSN 1434-6044

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Abstract

Data collected around vs root 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(-)) over bar, (Lambda) over bar or (Xi(-)) over bar 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. Within the context of the JETSET implementation of the string hadronization model, the diquark baryon production 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 with Lambda(Lambda) over bar and p pi(p) over bar correlations are not conclusive, if parameter uncertainties are considered.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 34861
Deposited By: Dr Ian Bailey
Deposited On: 14 Dec 2010 09:05
Refereed?: Yes
Published?: Published
Last Modified: 21 Sep 2017 03:53
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/34861

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