Quark and gluon jet properties in symmetric three-jet events

D. Buskulic, D. Casper, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, M. N. Minard, P. Odier, B. Pietrzyk, M. Chmeissani, J. M. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, A. Juste, M. Martinez, S. OrteuA. Pacheco, C. Padilla, F. Palla, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, F. Teubert, A. Colaleo, D. Creanza, M. De Palma, A. Farilla, G. Gelao, M. Girone, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, R. Alemany, A. O. Bazarko, G. Bonvicini, M. Cattaneo, P. Comas, P. Coyle, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. Harvey, R. Jacobsen, P. Janot, B. Jost, E. Kneringer, J. Knobloch, I. Lehraus, E. B. Martin, P. Mato, A. Minten, R. Miquel, Ll M. Mir, L. Moneta, T. Oest, P. Palazzi, J. R. Pater, J. F. Pusztaszeri, F. Ranjard, P. Rensin, L. Rolandi, D. Schlatter, M. Schmelling, O. Schneider, W. Tejessy, I. R. Tomalin, A. Venturi, H. Wachsmuth, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni

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66 Citations (Scopus)

Abstract

Quark and gluon jets with the same energy, 24 GeV, are compared in symmetric three-jet configurations from hadronic Z decays observed by the ALEPH detector. Jets are defined using the Durham algorithm. Gluon jets are identified using an anti-tag on b jets, based on a track impact parameter method. The comparison of gluon and mixed flavour quark jets shows that gluon jets have a softer fragmentation function, a larger angular width and a higher particle multiplicity. Evidence is presented which shows that the corresponding differences between gluon and b jets are significantly smaller. In a statistically limited comparison the multiplicity in c jets was found to be comparable with that observed for the jets of mixed quark flavour.
Original languageEnglish
Pages (from-to)353-364
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume384
Issue number1-4
DOIs
Publication statusPublished - 19 Sep 1996

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