Journal Article

Σ−-antihyperon correlations in Z0 decay and investigation of the baryon production mechanism

Yamashita, S., Geich-Gimbel, C., Orito, S., Quadt, A., Pahl, C., Frey, A., Chang, C. Y., Anderson, K. J., Dallavalle, M., Giunta, M., Barlow, R. J., Barillari, T., Bailey, I., Desch, K., Turner-Watson, M. F., Ciocca, C., Braibant, S., Kawamoto, T., Csilling, A., Vossebeld, J., Seuster, R., Pater, J. R., Giacomelli, G., Kennedy, B. W., Capiluppi, P., Carter, J. R., Hawkes, C. M., Schaile, O., Trócsányi, Z., Nakamura, I., Ludwig, J., Schumacher, M., Kawagoe, K., Meijers, F., Junk, T. R., Vollmer, C. F., Michelini, A., Smith, A. M., Wyatt, T. R., Bethke, S., Sachs, K., Plane, D. E., Wilson, J. A., Hawkings, R., Anagnostou, G., Karlen, D., Saeki, T., Abbiendi, G., O’Neale, S. W., Thomson, M. A., Watkins, P. M., Kuhl, T., Loebinger, F. K., Teuscher, R., Mättig, P., Mashimo, T., Tasevsky, M., Mikenberg, G., Letts, J., Duchovni, E., Axen, D., Hajdu, C., Ishii, K., Ueda, I., Boutemeur, M., Torrence, E., Gross, E., Mutter, A., Vannerem, P., Tarem, S., Jeremie, H., Cuffiani, M., Kanzaki, J., Meyer, N., Jovanovic, P., Menges, W., Ujvári, B., Fiedler, F., Verzocchi, M., Carnegie, R. K., Dienes, B., Biebel, O., Barberio, E., Kobel, M., Ford, M., Levinson, L., Ströhme

2009

Overview

Data collected around  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 Σ − hyperons whose baryon number is compensated by the production of a or 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 and correlations are not conclusive, if parameter uncertainties are considered.

• Publisher: Springer-Verlag,Springer,Springer Nature B.V
• Subject: Astronomy / Astrophysics and Cosmology / Baryons / Elementary Particles / Exact sciences and technology / Hadrons / Heavy Ions / Hyperons / Measurement Science and Instrumentation / Nuclear Energy / Nuclear Physics / Parameter uncertainty / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Regular Article - Experimental Physics / String Theory / The physics of elementary particles and fields