Abstract
We compared the multiplicities of π0, η0, Κ0 and of charged particles in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at LEP. The comparisons were performed for distributions unfolded to 100% pure quark and gluon jets, at an effective scale Qjet which took into account topological dependences of the 3-jet environment. The ratio of particle multiplicity in gluon jets to that in quark jets as a function of Qjet for π0, η or Κ0 was found to be independent of the particle species. This is consistent with the QCD prediction that the observed enhancement in the mean particle rate in gluon jets with respect to quark jets should be independent of particle species. In contrast to some theoretical predictions and previous observations, we observed no evidence for an enhancement of η meson production in gluon jets with respect to quark jets, beyond that observed for charged particles. We measured the ratio of the slope of the average charged particle multiplicity in gluon jets to that in quark jets, C, and we compared it to a next-to-next-to-next-to leading order calculation. Our result, C = 2.27 ± 0.20(stat. + syst.) is about one standard deviation higher than the perturbative prediction.
| Original language | English |
|---|---|
| Pages (from-to) | 373-387 |
| Number of pages | 15 |
| Journal | European Physical Journal C |
| Volume | 17 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2000 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)
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In: European Physical Journal C, Vol. 17, No. 3, 2000, p. 373-387.
Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Multiplicities of Π0, η, K0 and of charged particles in quark and gluon jets
AU - Abbiendi, G.
AU - Ackerstaff, K.
AU - Ainsley, C.
AU - Akesson, P. F.
AU - Alexander, G.
AU - Allison, J.
AU - Anderson, K. J.
AU - Arcelli, S.
AU - Asai, S.
AU - Ashby, S. F.
AU - Axen, D.
AU - Azuelos, G.
AU - Bailey, I.
AU - Ball, A. H.
AU - Barberio, E.
AU - Barlow, R. J.
AU - Batley, J. R.
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AU - Behnke, T.
AU - Bell, K. W.
AU - Bella, G.
AU - Bellerive, A.
AU - Bentvelsen, S.
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AU - Biebel, O.
AU - Bloodworth, I. J.
AU - Bock, P.
AU - Böhme, J.
AU - Boeriu, O.
AU - Bonacorsi, D.
AU - Boutemeur, M.
AU - Braibant, S.
AU - Bright-Thomas, P.
AU - Brigliadori, L.
AU - Brown, R. M.
AU - Burckhart, H. J.
AU - Cammin, J.
AU - Capiluppi, P.
AU - Carnegie, R. K.
AU - Carter, A. A.
AU - Carter, J. R.
AU - Chang, C. Y.
AU - Charlton, D. G.
AU - Ciocca, C.
AU - Clarke, P. E.L.
AU - Clay, E.
AU - Cohen, I.
AU - Cooke, O. C.
AU - Couchman, J.
AU - Couyoumtzelis, C.
AU - Coxe, R. L.
AU - Cuffiani, M.
AU - Dado, S.
AU - Dallavalle, G. M.
AU - Dallison, S.
AU - de Roeck, A.
AU - Dervan, P.
AU - Desch, K.
AU - Dienes, B.
AU - Dixit, M. S.
AU - Donkers, M.
AU - Dubbert, J.
AU - Duchovni, E.
AU - Duckeck, G.
AU - Duerdoth, I. P.
AU - Estabrooks, P. G.
AU - Etzion, E.
AU - Fabbri, F.
AU - Fanti, M.
AU - Feld, L.
AU - Ferrari, P.
AU - Fiedler, F.
AU - Fleck, I.
AU - Ford, M.
AU - Frey, A.
AU - Fürtjes, A.
AU - Futyan, D. I.
AU - Gagnon, P.
AU - Gary, J. W.
AU - Gaycken, G.
AU - Geich-Gimbel, C.
AU - Giacomelli, G.
AU - Giacomelli, P.
AU - Glenzinski, D.
AU - Goldberg, J.
AU - Grandi, C.
AU - Graham, K.
AU - Gross, E.
AU - Grunhaus, J.
AU - Gruwé, M.
AU - Günther, P. O.
AU - Hajdu, C.
AU - Hanson, G. G.
AU - Hansroul, M.
AU - Hapke, M.
AU - Harder, K.
AU - Harel, A.
AU - Hargrove, C. K.
AU - Harin-Dirac, M.
AU - Hauke, A.
AU - Hauschild, M.
AU - Hawkes, C. M.
AU - Hawkings, R.
AU - Hemingway, R. J.
AU - Hensel, C.
AU - Herten, G.
AU - Heuer, R. D.
AU - Hildreth, M. D.
AU - Hill, J. C.
AU - Hocker, A.
AU - Hoffman, K.
AU - Homer, R. J.
AU - Honma, A. K.
AU - Horváth, D.
AU - Hossain, K. R.
AU - Howard, R.
AU - Hüntemeyer, P.
AU - Igo-Kemenes, P.
AU - Ishii, K.
AU - Jacob, F. R.
AU - Jawahery, A.
AU - Jeremie, H.
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AU - Junk, T. R.
AU - Kanaya, N.
AU - Kanzaki, J.
AU - Karapetian, G.
AU - Karlen, D.
AU - Kartvelishvili, V.
AU - Kawagoe, K.
AU - Kawamoto, T.
AU - Keeler, R. K.
AU - Kellogg, R. G.
AU - Kennedy, B. W.
AU - Kim, D. H.
AU - Klein, K.
AU - Klier, A.
AU - Kobayashi, T.
AU - Kobel, M.
AU - Kokott, T. P.
AU - Komamiya, S.
AU - Kowalewski, R. V.
AU - Kress, T.
AU - Krieger, P.
AU - von Krogh, J.
AU - Kuhl, T.
AU - Kupper, M.
AU - Kyberd, P.
AU - Lafferty, G. D.
AU - Landsman, H.
AU - Lanske, D.
AU - Lawson, I.
AU - Layter, J. G.
AU - Leins, A.
AU - Lellouch, D.
AU - Letts, J.
AU - Levinson, L.
AU - Liebisch, R.
AU - Lillich, J.
AU - List, B.
AU - Littlewood, C.
AU - Lloyd, A. W.
AU - Lloyd, S. L.
AU - Loebinger, F. K.
AU - Long, G. D.
AU - Losty, M. J.
AU - Lu, J.
AU - Ludwig, J.
AU - Macchiolo, A.
AU - Macpherson, A.
AU - Mader, W.
AU - Mannelli, M.
AU - Marcellini, S.
AU - Marchant, T. E.
AU - Martin, A. J.
AU - Martin, J. P.
AU - Martinez, G.
AU - Mashimo, T.
AU - Mättig, P.
AU - McDonald, W. J.
AU - McKenna, J.
AU - McMahon, T. J.
AU - McPherson, R. A.
AU - Meijers, F.
AU - Mendez-Lorenzo, P.
AU - Merritt, F. S.
AU - Mes, H.
AU - Michelini, A.
AU - Mihara, S.
AU - Mikenberg, G.
AU - Miller, D. J.
AU - Mohr, W.
AU - Montanari, A.
AU - Mori, T.
AU - Nagai, K.
AU - Nakamura, I.
AU - Neal, H. A.
AU - Nisius, R.
AU - O'Neale, S. W.
AU - Oakham, F. G.
AU - Odorici, F.
AU - Ogren, H. O.
AU - Oh, A.
AU - Okpara, A.
AU - Oreglia, M. J.
AU - Orito, S.
AU - Pásztor, G.
AU - Pater, J. R.
AU - Patrick, G. N.
AU - Patt, J.
AU - Pfeifenschneider, P.
AU - Pilcher, J. E.
AU - Pinfold, J.
AU - Plane, D. E.
AU - Poli, B.
AU - Polok, J.
AU - Pooth, O.
AU - Przybycień, M.
AU - Quadt, A.
AU - Rembser, C.
AU - Rick, H.
AU - Robins, S. A.
AU - Rodning, N.
AU - Roney, J. M.
AU - Rosati, S.
AU - Roscoe, K.
AU - Rossi, A. M.
AU - Rozen, Y.
AU - Runge, K.
AU - Runolfsson, O.
AU - Rust, D. R.
AU - Sachs, K.
AU - Saeki, T.
AU - Sahr, O.
AU - Sarkisyan, E. K.G.
AU - Sbarra, C.
AU - Schaile, A. D.
AU - Schaile, O.
AU - Scharff-Hansen, P.
AU - Schmitt, S.
AU - Schröder, M.
AU - Schumacher, M.
AU - Schwick, C.
AU - Scott, W. G.
AU - Seuster, R.
AU - Shears, T. G.
AU - Shen, B. C.
AU - Shepherd-Themistocleous, C. H.
AU - Sherwood, P.
AU - Siroli, G. P.
AU - Skuja, A.
AU - Smith, A. M.
AU - Snow, G. A.
AU - Sobie, R.
AU - Söldner-Rembold, S.
AU - Spagnolo, S.
AU - Sproston, M.
AU - Stahl, A.
AU - Stephens, K.
AU - Stoll, K.
AU - Strom, D.
AU - Ströhmer, R.
AU - Surrow, B.
AU - Talbot, S. D.
AU - Tarem, S.
AU - Taylor, R. J.
AU - Teuscher, R.
AU - Thiergen, M.
AU - Thomas, J.
AU - Thomson, M. A.
AU - Torrence, E.
AU - Towers, S.
AU - Trefzger, T.
AU - Trigger, I.
AU - Trócsányi, Z.
AU - Tsur, E.
AU - Turner-Watson, M. F.
AU - Ueda, I.
AU - Vannerem, P.
AU - Verzocchi, M.
AU - Voss, H.
AU - Vossebeld, J.
AU - Waller, D.
AU - Ward, C. P.
AU - Ward, D. R.
AU - Watkins, P. M.
AU - Watson, A. T.
AU - Watson, N. K.
AU - Wells, P. S.
AU - Wengler, T.
AU - Wermes, N.
AU - Wilson, G. W.
AU - Wilson, J. A.
AU - Wyatt, T. R.
AU - Yamashita, S.
AU - Zacek, V.
AU - Zer-Zion, D.
PY - 2000
Y1 - 2000
N2 - We compared the multiplicities of π0, η0, Κ0 and of charged particles in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at LEP. The comparisons were performed for distributions unfolded to 100% pure quark and gluon jets, at an effective scale Qjet which took into account topological dependences of the 3-jet environment. The ratio of particle multiplicity in gluon jets to that in quark jets as a function of Qjet for π0, η or Κ0 was found to be independent of the particle species. This is consistent with the QCD prediction that the observed enhancement in the mean particle rate in gluon jets with respect to quark jets should be independent of particle species. In contrast to some theoretical predictions and previous observations, we observed no evidence for an enhancement of η meson production in gluon jets with respect to quark jets, beyond that observed for charged particles. We measured the ratio of the slope of the average charged particle multiplicity in gluon jets to that in quark jets, C, and we compared it to a next-to-next-to-next-to leading order calculation. Our result, C = 2.27 ± 0.20(stat. + syst.) is about one standard deviation higher than the perturbative prediction.
AB - We compared the multiplicities of π0, η0, Κ0 and of charged particles in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at LEP. The comparisons were performed for distributions unfolded to 100% pure quark and gluon jets, at an effective scale Qjet which took into account topological dependences of the 3-jet environment. The ratio of particle multiplicity in gluon jets to that in quark jets as a function of Qjet for π0, η or Κ0 was found to be independent of the particle species. This is consistent with the QCD prediction that the observed enhancement in the mean particle rate in gluon jets with respect to quark jets should be independent of particle species. In contrast to some theoretical predictions and previous observations, we observed no evidence for an enhancement of η meson production in gluon jets with respect to quark jets, beyond that observed for charged particles. We measured the ratio of the slope of the average charged particle multiplicity in gluon jets to that in quark jets, C, and we compared it to a next-to-next-to-next-to leading order calculation. Our result, C = 2.27 ± 0.20(stat. + syst.) is about one standard deviation higher than the perturbative prediction.
UR - http://www.scopus.com/inward/record.url?scp=0039975581&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0039975581&partnerID=8YFLogxK
U2 - 10.1007/s100520000505
DO - 10.1007/s100520000505
M3 - Article
AN - SCOPUS:0039975581
SN - 1434-6044
VL - 17
SP - 373
EP - 387
JO - European Physical Journal C
JF - European Physical Journal C
IS - 3
ER -