抄録
The charged particle multiplicities of two- and three-jet events from the reaction e+e- → Z0 → hadrons are measured for Z0 decays to light quark (uds) flavors. Using recent theoretical expressions to account for biases from event selection, results corresponding to unbiased gluon jets are extracted over a range of jet energies from about 11 to 30 GeV. We find consistency between these results and direct measurements of unbiased gluon jet multiplicity from Γ and Z0 decays. The unbiased gluon jet data including the direct measurements are compared to corresponding results for quark jets. We perform fits based on analytic expressions for particle multiplicity in jets to determine the ratio r = Ng/Nq of multiplicities between gluon and quark jets as a function of energy. We also determine the ratio of slopes, r(1) ≡ (dNg/dy)/(dNq/dy), and of curvatures, r (2) ≡ (d2Ng/dy2)/(d 2Nq/dy2), where y specifies the energy scale. At 30 GeV, we find r - 1.422 ± 0.051, r(1) = 1.761 ± 0.071 and r(2) = 1.98 ± 0.13, where the uncertainties are the statistical and systematic terms added in quadrature. These results are in general agreement with theoretical predictions. In addition, we use the measurements of the energy dependence of Ng and Nq to determine an effective value of the ratio of QCD color factors, C A/CF. Our result, CA/CF = 2.23 ± 0.14 (total), is consistent with the QCD value of 2.25.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 597-613 |
| ページ数 | 17 |
| ジャーナル | European Physical Journal C |
| 巻 | 23 |
| 号 | 4 |
| DOI | |
| 出版ステータス | Published - 2002 4月 |
| 外部発表 | はい |
ASJC Scopus subject areas
- 工学（その他）
- 物理学および天文学（その他）
フィンガープリント
「Particle multiplicity of unbiased gluon jets from e+e - three-jet events」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。引用スタイル
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In: European Physical Journal C, Vol. 23, No. 4, 04.2002, p. 597-613.
研究成果: Article › 査読
}
TY - JOUR
T1 - Particle multiplicity of unbiased gluon jets from e+e - three-jet events
AU - Abbiendi, G.
AU - Ainsley, C.
AU - Åkesson, P. F.
AU - Alexander, G.
AU - Allison, J.
AU - Anagnostou, G.
AU - Anderson, K. J.
AU - Arcelli, S.
AU - Asai, S.
AU - Axen, D.
AU - Azuelos, G.
AU - Bailey, I.
AU - Barberio, E.
AU - Barlow, R. J.
AU - Batley, R. J.
AU - Bechtle, P.
AU - Behnke, T.
AU - Bell, K. W.
AU - Bell, P. J.
AU - Bella, G.
AU - Bellerive, A.
AU - Benelli, G.
AU - Bethke, S.
AU - Biebel, O.
AU - Bloodworth, I. J.
AU - Boeriu, O.
AU - Bock, P.
AU - Böhme, J.
AU - Bonacorsi, D.
AU - Boutemeur, M.
AU - Braibant, S.
AU - Brigliadori, L.
AU - Brown, R. M.
AU - Burckhart, H. J.
AU - Cammin, J.
AU - Campana, S.
AU - Carnegie, R. K.
AU - Caron, B.
AU - Carter, A. A.
AU - Carter, J. R.
AU - Chang, C. Y.
AU - Charlton, D. G.
AU - Clarke, P. E.L.
AU - Clay, E.
AU - Cohen, I.
AU - Couchman, J.
AU - Csilling, A.
AU - Cuffiani, M.
AU - Dado, S.
AU - Dallavalle, G. M.
AU - Dallison, S.
AU - de Roeck, A.
AU - de Wolf, E. A.
AU - Dervan, P.
AU - Desch, K.
AU - Dienes, B.
AU - Donkers, M.
AU - Dubbert, J.
AU - Duchovni, E.
AU - Duckeck, G.
AU - Duerdoth, I. P.
AU - Etzion, E.
AU - Fabbri, F.
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 - Giunta, M.
AU - Goldberg, J.
AU - Graham, K.
AU - Gross, E.
AU - Grunhaus, J.
AU - Gruwe, M.
AU - Günther, P. O.
AU - Gupta, A.
AU - Hajdu, C.
AU - Hamann, M.
AU - Hanson, G. G.
AU - Harder, K.
AU - Harel, A.
AU - Harin-Dirac, M.
AU - Hauschild, M.
AU - Hauschildt, J.
AU - Hawkes, C. M.
AU - Hawkings, R.
AU - Hemingway, R. J.
AU - Hensel, C.
AU - Herten, G.
AU - Heuer, R. D.
AU - Hill, J. C.
AU - Hoffman, K.
AU - Homer, R. J.
AU - Horváth, D.
AU - Hossain, K. R.
AU - Howard, R.
AU - Hüntemeyer, P.
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AU - Ishii, K.
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AU - Jones, C. R.
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AU - Kanzaki, J.
AU - Karapetian, G.
AU - Karlen, D.
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AU - Kawagoe, K.
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AU - Keeler, R. K.
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AU - Kluth, S.
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AU - Komamiya, S.
AU - Kowalewski, R. V.
AU - Krämer, T.
AU - Kress, T.
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AU - Krop, D.
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AU - Kupper, M.
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AU - Lafferty, G. D.
AU - Landsman, H.
AU - Lanske, D.
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AU - Layter, J. G.
AU - Leins, A.
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AU - Littlewood, C.
AU - Lloyd, S. L.
AU - Loebinger, F. K.
AU - Lu, J.
AU - Ludwig, J.
AU - Macchiolo, A.
AU - Macpherson, A.
AU - Mader, W.
AU - Marcellini, S.
AU - Marchant, T. E.
AU - Martin, A. J.
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AU - Martinez, G.
AU - Masetti, 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 - Menges, W.
AU - Merritt, F. S.
AU - Mes, H.
AU - Michelini, A.
AU - Mihara, S.
AU - Mikenberg, G.
AU - Miller, D. J.
AU - Moed, S.
AU - Mohr, W.
AU - Mori, T.
AU - Mutter, A.
AU - Nagai, K.
AU - Nakamura, I.
AU - Neal, H. A.
AU - Nisius, R.
AU - O'Neale, S. W.
AU - Oh, A.
AU - Okpara, A.
AU - Oreglia, M. J.
AU - Orito, S.
AU - Pahl, C.
AU - Pásztor, G.
AU - Pater, J. R.
AU - Patrick, G. N.
AU - Pilcher, J. E.
AU - Pinfold, J.
AU - Plane, D. E.
AU - Poli, B.
AU - Polok, J.
AU - Pooth, O.
AU - Quadt, A.
AU - Rabbertz, K.
AU - Rembser, C.
AU - Renkel, P.
AU - Rick, H.
AU - Rodning, N.
AU - Roney, J. M.
AU - Rosati, S.
AU - Roscoe, K.
AU - Rozen, Y.
AU - Runge, K.
AU - Rust, D. R.
AU - Sachs, K.
AU - Saeki, T.
AU - Sahr, O.
AU - Sarkisyan, E. K.G.
AU - Schaile, A. D.
AU - Schaile, O.
AU - Scharff-Hansen, P.
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 - Skuja, A.
AU - Smith, A. M.
AU - Snow, G. A.
AU - Sobie, R.
AU - Söldner-Rembold, S.
AU - Spagnolo, S.
AU - Spano, F.
AU - Sproston, M.
AU - Stahl, A.
AU - Stephens, K.
AU - Strom, D.
AU - Strühmer, R.
AU - Stumpf, L.
AU - Surrow, B.
AU - Tarem, S.
AU - Tasevsky, M.
AU - Taylor, R. J.
AU - Teuscher, R.
AU - Thomas, J.
AU - Thomson, M. A.
AU - Torrence, E.
AU - Toya, D.
AU - Trefzger, T.
AU - Tricoli, A.
AU - Trigger, I.
AU - Trócsányi, Z.
AU - Tsur, E.
AU - Turner-Watson, M. F.
AU - Ueda, I.
AU - Ujvári, B.
AU - Vachon, B.
AU - Vollmer, C. F.
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 - Wetterling, D.
AU - Wilson, G. W.
AU - Wilson, J. A.
AU - Wyatt, T. R.
AU - Yamashita, S.
AU - Zacek, V.
AU - Zer-Zion, D.
PY - 2002/4
Y1 - 2002/4
N2 - The charged particle multiplicities of two- and three-jet events from the reaction e+e- → Z0 → hadrons are measured for Z0 decays to light quark (uds) flavors. Using recent theoretical expressions to account for biases from event selection, results corresponding to unbiased gluon jets are extracted over a range of jet energies from about 11 to 30 GeV. We find consistency between these results and direct measurements of unbiased gluon jet multiplicity from Γ and Z0 decays. The unbiased gluon jet data including the direct measurements are compared to corresponding results for quark jets. We perform fits based on analytic expressions for particle multiplicity in jets to determine the ratio r = Ng/Nq of multiplicities between gluon and quark jets as a function of energy. We also determine the ratio of slopes, r(1) ≡ (dNg/dy)/(dNq/dy), and of curvatures, r (2) ≡ (d2Ng/dy2)/(d 2Nq/dy2), where y specifies the energy scale. At 30 GeV, we find r - 1.422 ± 0.051, r(1) = 1.761 ± 0.071 and r(2) = 1.98 ± 0.13, where the uncertainties are the statistical and systematic terms added in quadrature. These results are in general agreement with theoretical predictions. In addition, we use the measurements of the energy dependence of Ng and Nq to determine an effective value of the ratio of QCD color factors, C A/CF. Our result, CA/CF = 2.23 ± 0.14 (total), is consistent with the QCD value of 2.25.
AB - The charged particle multiplicities of two- and three-jet events from the reaction e+e- → Z0 → hadrons are measured for Z0 decays to light quark (uds) flavors. Using recent theoretical expressions to account for biases from event selection, results corresponding to unbiased gluon jets are extracted over a range of jet energies from about 11 to 30 GeV. We find consistency between these results and direct measurements of unbiased gluon jet multiplicity from Γ and Z0 decays. The unbiased gluon jet data including the direct measurements are compared to corresponding results for quark jets. We perform fits based on analytic expressions for particle multiplicity in jets to determine the ratio r = Ng/Nq of multiplicities between gluon and quark jets as a function of energy. We also determine the ratio of slopes, r(1) ≡ (dNg/dy)/(dNq/dy), and of curvatures, r (2) ≡ (d2Ng/dy2)/(d 2Nq/dy2), where y specifies the energy scale. At 30 GeV, we find r - 1.422 ± 0.051, r(1) = 1.761 ± 0.071 and r(2) = 1.98 ± 0.13, where the uncertainties are the statistical and systematic terms added in quadrature. These results are in general agreement with theoretical predictions. In addition, we use the measurements of the energy dependence of Ng and Nq to determine an effective value of the ratio of QCD color factors, C A/CF. Our result, CA/CF = 2.23 ± 0.14 (total), is consistent with the QCD value of 2.25.
UR - http://www.scopus.com/inward/record.url?scp=23044534582&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=23044534582&partnerID=8YFLogxK
U2 - 10.1007/s100520200926
DO - 10.1007/s100520200926
M3 - Article
AN - SCOPUS:23044534582
SN - 1434-6044
VL - 23
SP - 597
EP - 613
JO - European Physical Journal C
JF - European Physical Journal C
IS - 4
ER -