Particle multiplicity of unbiased gluon jets from e+e - three-jet events

G. Abbiendi; C. Ainsley; P. F. Åkesson; G. Alexander; J. Allison; G. Anagnostou; K. J. Anderson; S. Arcelli; S. Asai; D. Axen; G. Azuelos; I. Bailey; E. Barberio; R. J. Barlow; R. J. Batley; P. Bechtle; T. Behnke; K. W. Bell; P. J. Bell; G. Bella; A. Bellerive; G. Benelli; S. Bethke; O. Biebel; I. J. Bloodworth; O. Boeriu; P. Bock; J. Böhme; D. Bonacorsi; M. Boutemeur; S. Braibant; L. Brigliadori; R. M. Brown; H. J. Burckhart; J. Cammin; S. Campana; R. K. Carnegie; B. Caron; A. A. Carter; J. R. Carter; C. Y. Chang; D. G. Charlton; P. E.L. Clarke; E. Clay; I. Cohen; J. Couchman; A. Csilling; M. Cuffiani; S. Dado; G. M. Dallavalle; S. Dallison; A. de Roeck; E. A. de Wolf; P. Dervan; K. Desch; B. Dienes; M. Donkers; J. Dubbert; E. Duchovni; G. Duckeck; I. P. Duerdoth; E. Etzion; F. Fabbri; L. Feld; P. Ferrari; F. Fiedler; I. Fleck; M. Ford; A. Frey; A. Fürtjes; D. I. Futyan; P. Gagnon; J. W. Gary; G. Gaycken; C. Geich-Gimbel; G. Giacomelli; P. Giacomelli; M. Giunta; J. Goldberg; K. Graham; E. Gross; J. Grunhaus; M. Gruwe; P. O. Günther; A. Gupta; C. Hajdu; M. Hamann; G. G. Hanson; K. Harder; A. Harel; M. Harin-Dirac; M. Hauschild; J. Hauschildt; C. M. Hawkes; R. Hawkings; R. J. Hemingway; C. Hensel; G. Herten; R. D. Heuer; J. C. Hill; K. Hoffman; R. J. Homer; D. Horváth; K. R. Hossain; R. Howard; P. Hüntemeyer; P. Igo-Kemenes; K. Ishii; A. Jawahery; H. Jeremie; C. R. Jones; P. Jovanovic; T. R. Junk; N. Kanaya; J. Kanzaki; G. Karapetian; D. Karlen; V. Kartvelishvili; K. Kawagoe; T. Kawamoto; R. K. Keeler; R. G. Kellogg; B. W. Kennedy; D. H. Kim; K. Klein; A. Klier; S. Kluth; T. Kobayashi; M. Kobel; T. P. Kokott; S. Komamiya; R. V. Kowalewski; T. Krämer; T. Kress; J. von Krogh; D. Krop; T. Kuhl; M. Kupper; P. Kyberd; G. D. Lafferty; H. Landsman; D. Lanske; I. Lawson; J. G. Layter; A. Leins; D. Lellouch; J. Letts; L. Levinson; J. Lillich; C. Littlewood; S. L. Lloyd; F. K. Loebinger; J. Lu; J. Ludwig; A. Macchiolo; A. Macpherson; W. Mader; S. Marcellini; T. E. Marchant; A. J. Martin; J. P. Martin; G. Martinez; G. Masetti; T. Mashimo; P. Mättig; W. J. McDonald; J. McKenna; T. J. McMahon; R. A. McPherson; F. Meijers; P. Mendez-Lorenzo; W. Menges; F. S. Merritt; H. Mes; A. Michelini; S. Mihara; G. Mikenberg; D. J. Miller; S. Moed; W. Mohr; T. Mori; A. Mutter; K. Nagai; I. Nakamura; H. A. Neal; R. Nisius; S. W. O'Neale; A. Oh; A. Okpara; M. J. Oreglia; S. Orito; C. Pahl; G. Pásztor; J. R. Pater; G. N. Patrick; J. E. Pilcher; J. Pinfold; D. E. Plane; B. Poli; J. Polok; O. Pooth; A. Quadt; K. Rabbertz; C. Rembser; P. Renkel; H. Rick; N. Rodning; J. M. Roney; S. Rosati; K. Roscoe; Y. Rozen; K. Runge; D. R. Rust; K. Sachs; T. Saeki; O. Sahr; E. K.G. Sarkisyan; A. D. Schaile; O. Schaile; P. Scharff-Hansen; M. Schröder; M. Schumacher; C. Schwick; W. G. Scott; R. Seuster; T. G. Shears; B. C. Shen; C. H. Shepherd-Themistocleous; P. Sherwood; A. Skuja; A. M. Smith; G. A. Snow; R. Sobie; S. Söldner-Rembold; S. Spagnolo; F. Spano; M. Sproston; A. Stahl; K. Stephens; D. Strom; R. Strühmer; L. Stumpf; B. Surrow; S. Tarem; M. Tasevsky; R. J. Taylor; R. Teuscher; J. Thomas; M. A. Thomson; E. Torrence; D. Toya; T. Trefzger; A. Tricoli; I. Trigger; Z. Trócsányi; E. Tsur; M. F. Turner-Watson; I. Ueda; B. Ujvári; B. Vachon; C. F. Vollmer; P. Vannerem; M. Verzocchi; H. Voss; J. Vossebeld; D. Waller; C. P. Ward; D. R. Ward; P. M. Watkins; A. T. Watson; N. K. Watson; P. S. Wells; T. Wengler; N. Wermes; D. Wetterling; G. W. Wilson; J. A. Wilson; T. R. Wyatt; S. Yamashita; V. Zacek; D. Zer-Zion

doi:10.1007/s100520200926

Particle multiplicity of unbiased gluon jets from e⁺e ^- three-jet events

G. Abbiendi, C. Ainsley, P. F. Åkesson, G. Alexander, J. Allison, G. Anagnostou, K. J. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, I. Bailey, E. Barberio, R. J. Barlow, R. J. Batley, P. Bechtle, T. Behnke, K. W. Bell, P. J. Bell, G. BellaA. Bellerive, G. Benelli, S. Bethke, O. Biebel, I. J. Bloodworth, O. Boeriu, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, L. Brigliadori, R. M. Brown, H. J. Burckhart, J. Cammin, S. Campana, R. K. Carnegie, B. Caron, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, P. E.L. Clarke, E. Clay, I. Cohen, J. Couchman, A. Csilling, M. Cuffiani, S. Dado, G. M. Dallavalle, S. Dallison, A. de Roeck, E. A. de Wolf, P. Dervan, K. Desch, B. Dienes, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I. P. Duerdoth, E. Etzion, F. Fabbri, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, A. Fürtjes, D. I. Futyan, P. Gagnon, J. W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, M. Giunta, J. Goldberg, K. Graham, E. Gross, J. Grunhaus, M. Gruwe, P. O. Günther, A. Gupta, C. Hajdu, M. Hamann, G. G. Hanson, K. Harder, A. Harel, M. Harin-Dirac, M. Hauschild, J. Hauschildt, C. M. Hawkes, R. Hawkings, R. J. Hemingway, C. Hensel, G. Herten, R. D. Heuer, J. C. Hill, K. Hoffman, R. J. Homer, D. Horváth, K. R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, A. Jawahery, H. Jeremie, C. R. Jones, P. Jovanovic, T. R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, D. H. Kim, K. Klein, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, T. P. Kokott, S. Komamiya, R. V. Kowalewski, T. Krämer, T. Kress, J. von Krogh, D. Krop, T. Kuhl, M. Kupper, P. Kyberd, G. D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J. G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, J. Lillich, C. Littlewood, S. L. Lloyd, F. K. Loebinger, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, S. Marcellini, T. E. Marchant, A. J. Martin, J. P. Martin, G. Martinez, G. Masetti, T. Mashimo, P. Mättig, W. J. McDonald, J. McKenna, T. J. McMahon, R. A. McPherson, F. Meijers, P. Mendez-Lorenzo, W. Menges, F. S. Merritt, H. Mes, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, S. Moed, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H. A. Neal, R. Nisius, S. W. O'Neale, A. Oh, A. Okpara, M. J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J. R. Pater, G. N. Patrick, J. E. Pilcher, J. Pinfold, D. E. Plane, B. Poli, J. Polok, O. Pooth, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, H. Rick, N. Rodning, J. M. Roney, S. Rosati, K. Roscoe, Y. Rozen, K. Runge, D. R. Rust, K. Sachs, T. Saeki, O. Sahr, E. K.G. Sarkisyan, A. D. Schaile, O. Schaile, P. Scharff-Hansen, M. Schröder, M. Schumacher, C. Schwick, W. G. Scott, R. Seuster, T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, A. Skuja, A. M. Smith, G. A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, F. Spano, M. Sproston, A. Stahl, K. Stephens, D. Strom, R. Strühmer, L. Stumpf, B. Surrow, S. Tarem, M. Tasevsky, R. J. Taylor, R. Teuscher, J. Thomas, M. A. Thomson, E. Torrence, D. Toya, T. Trefzger, A. Tricoli, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, B. Ujvári, B. Vachon, C. F. Vollmer, P. Vannerem, M. Verzocchi, H. Voss, J. Vossebeld, D. Waller, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. S. Wells, T. Wengler, N. Wermes, D. Wetterling, G. W. Wilson, J. A. Wilson, T. R. Wyatt, S. Yamashita, V. Zacek, D. Zer-Zion

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

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 = N_g/N_q of multiplicities between gluon and quark jets as a function of energy. We also determine the ratio of slopes, r⁽¹⁾ ≡ (dN_g/dy)/(dN_q/dy), and of curvatures, r ⁽²⁾ ≡ (d²N_g/dy²)/(d ²N_q/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 N_g and N_q to determine an effective value of the ratio of QCD color factors, C _A/C_F. Our result, C_A/C_F = 2.23 ± 0.14 (total), is consistent with the QCD value of 2.25.

Original language	English (US)
Pages (from-to)	597-613
Number of pages	17
Journal	European Physical Journal C
Volume	23
Issue number	4
DOIs	https://doi.org/10.1007/s100520200926
State	Published - Apr 2002
Externally published	Yes

ASJC Scopus subject areas

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

Access to Document

10.1007/s100520200926

Cite this

Abbiendi, G., Ainsley, C., Åkesson, P. F., Alexander, G., Allison, J., Anagnostou, G., Anderson, K. J., Arcelli, S., Asai, S., Axen, D., Azuelos, G., Bailey, I., Barberio, E., Barlow, R. J., Batley, R. J., Bechtle, P., Behnke, T., Bell, K. W., Bell, P. J., ... Zer-Zion, D. (2002). Particle multiplicity of unbiased gluon jets from e⁺e ^- three-jet events. European Physical Journal C, 23(4), 597-613. https://doi.org/10.1007/s100520200926

Abbiendi, G, Ainsley, C, Åkesson, PF, Alexander, G, Allison, J, Anagnostou, G, Anderson, KJ, Arcelli, S, Asai, S, Axen, D, Azuelos, G, Bailey, I, Barberio, E, Barlow, RJ, Batley, RJ, Bechtle, P, Behnke, T, Bell, KW, Bell, PJ, Bella, G, Bellerive, A, Benelli, G, Bethke, S, Biebel, O, Bloodworth, IJ, Boeriu, O, Bock, P, Böhme, J, Bonacorsi, D, Boutemeur, M, Braibant, S, Brigliadori, L, Brown, RM, Burckhart, HJ, Cammin, J, Campana, S, Carnegie, RK, Caron, B, Carter, AA, Carter, JR, Chang, CY, Charlton, DG, Clarke, PEL, Clay, E, Cohen, I, Couchman, J, Csilling, A, Cuffiani, M, Dado, S, Dallavalle, GM, Dallison, S, de Roeck, A, de Wolf, EA, Dervan, P, Desch, K, Dienes, B, Donkers, M, Dubbert, J, Duchovni, E, Duckeck, G, Duerdoth, IP, Etzion, E, Fabbri, F, Feld, L, Ferrari, P, Fiedler, F, Fleck, I, Ford, M, Frey, A, Fürtjes, A, Futyan, DI, Gagnon, P, Gary, JW, Gaycken, G, Geich-Gimbel, C, Giacomelli, G, Giacomelli, P, Giunta, M, Goldberg, J, Graham, K, Gross, E, Grunhaus, J, Gruwe, M, Günther, PO, Gupta, A, Hajdu, C, Hamann, M, Hanson, GG, Harder, K, Harel, A, Harin-Dirac, M, Hauschild, M, Hauschildt, J, Hawkes, CM, Hawkings, R, Hemingway, RJ, Hensel, C, Herten, G, Heuer, RD, Hill, JC, Hoffman, K, Homer, RJ, Horváth, D, Hossain, KR, Howard, R, Hüntemeyer, P, Igo-Kemenes, P, Ishii, K, Jawahery, A, Jeremie, H, Jones, CR, Jovanovic, P, Junk, TR, Kanaya, N, Kanzaki, J, Karapetian, G, Karlen, D, Kartvelishvili, V, Kawagoe, K, Kawamoto, T, Keeler, RK, Kellogg, RG, Kennedy, BW, Kim, DH, Klein, K, Klier, A, Kluth, S, Kobayashi, T, Kobel, M, Kokott, TP, Komamiya, S, Kowalewski, RV, Krämer, T, Kress, T, von Krogh, J, Krop, D, Kuhl, T, Kupper, M, Kyberd, P, Lafferty, GD, Landsman, H, Lanske, D, Lawson, I, Layter, JG, Leins, A, Lellouch, D, Letts, J, Levinson, L, Lillich, J, Littlewood, C, Lloyd, SL, Loebinger, FK, Lu, J, Ludwig, J, Macchiolo, A, Macpherson, A, Mader, W, Marcellini, S, Marchant, TE, Martin, AJ, Martin, JP, Martinez, G, Masetti, G, Mashimo, T, Mättig, P, McDonald, WJ, McKenna, J, McMahon, TJ, McPherson, RA, Meijers, F, Mendez-Lorenzo, P, Menges, W, Merritt, FS, Mes, H, Michelini, A, Mihara, S, Mikenberg, G, Miller, DJ, Moed, S, Mohr, W, Mori, T, Mutter, A, Nagai, K, Nakamura, I, Neal, HA, Nisius, R, O'Neale, SW, Oh, A, Okpara, A, Oreglia, MJ, Orito, S, Pahl, C, Pásztor, G, Pater, JR, Patrick, GN, Pilcher, JE, Pinfold, J, Plane, DE, Poli, B, Polok, J, Pooth, O, Quadt, A, Rabbertz, K, Rembser, C, Renkel, P, Rick, H, Rodning, N, Roney, JM, Rosati, S, Roscoe, K, Rozen, Y, Runge, K, Rust, DR, Sachs, K, Saeki, T, Sahr, O, Sarkisyan, EKG, Schaile, AD, Schaile, O, Scharff-Hansen, P, Schröder, M, Schumacher, M, Schwick, C, Scott, WG, Seuster, R, Shears, TG, Shen, BC, Shepherd-Themistocleous, CH, Sherwood, P, Skuja, A, Smith, AM, Snow, GA, Sobie, R, Söldner-Rembold, S, Spagnolo, S, Spano, F, Sproston, M, Stahl, A, Stephens, K, Strom, D, Strühmer, R, Stumpf, L, Surrow, B, Tarem, S, Tasevsky, M, Taylor, RJ, Teuscher, R, Thomas, J, Thomson, MA, Torrence, E, Toya, D, Trefzger, T, Tricoli, A, Trigger, I, Trócsányi, Z, Tsur, E, Turner-Watson, MF, Ueda, I, Ujvári, B, Vachon, B, Vollmer, CF, Vannerem, P, Verzocchi, M, Voss, H, Vossebeld, J, Waller, D, Ward, CP, Ward, DR, Watkins, PM, Watson, AT, Watson, NK, Wells, PS, Wengler, T, Wermes, N, Wetterling, D, Wilson, GW, Wilson, JA, Wyatt, TR, Yamashita, S, Zacek, V & Zer-Zion, D 2002, 'Particle multiplicity of unbiased gluon jets from e⁺e ^- three-jet events', European Physical Journal C, vol. 23, no. 4, pp. 597-613. https://doi.org/10.1007/s100520200926

@article{df79be765c034fdc9418c14412e9adfd,

title = "Particle multiplicity of unbiased gluon jets from e+e - three-jet events",

abstract = "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.",

author = "G. Abbiendi and C. Ainsley and {\AA}kesson, {P. F.} and G. Alexander and J. Allison and G. Anagnostou and Anderson, {K. J.} and S. Arcelli and S. Asai and D. Axen and G. Azuelos and I. Bailey and E. Barberio and Barlow, {R. J.} and Batley, {R. J.} and P. Bechtle and T. Behnke and Bell, {K. W.} and Bell, {P. J.} and G. Bella and A. Bellerive and G. Benelli and S. Bethke and O. Biebel and Bloodworth, {I. J.} and O. Boeriu and P. Bock and J. B{\"o}hme and D. Bonacorsi and M. Boutemeur and S. Braibant and L. Brigliadori and Brown, {R. M.} and Burckhart, {H. J.} and J. Cammin and S. Campana and Carnegie, {R. K.} and B. Caron and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and Clarke, {P. E.L.} and E. Clay and I. Cohen and J. Couchman and A. Csilling and M. Cuffiani and S. Dado and Dallavalle, {G. M.} and S. Dallison and {de Roeck}, A. and {de Wolf}, {E. A.} and P. Dervan and K. Desch and B. Dienes and M. Donkers and J. Dubbert and E. Duchovni and G. Duckeck and Duerdoth, {I. P.} and E. Etzion and F. Fabbri and L. Feld and P. Ferrari and F. Fiedler and I. Fleck and M. Ford and A. Frey and A. F{\"u}rtjes and Futyan, {D. I.} and P. Gagnon and Gary, {J. W.} and G. Gaycken and C. Geich-Gimbel and G. Giacomelli and P. Giacomelli and M. Giunta and J. Goldberg and K. Graham and E. Gross and J. Grunhaus and M. Gruwe and G{\"u}nther, {P. O.} and A. Gupta and C. Hajdu and M. Hamann and Hanson, {G. G.} and K. Harder and A. Harel and M. Harin-Dirac and M. Hauschild and J. Hauschildt and Hawkes, {C. M.} and R. Hawkings and Hemingway, {R. J.} and C. Hensel and G. Herten and Heuer, {R. D.} and Hill, {J. C.} and K. Hoffman and Homer, {R. J.} and D. Horv{\'a}th and Hossain, {K. R.} and R. Howard and P. H{\"u}ntemeyer and P. Igo-Kemenes and K. Ishii and A. Jawahery and H. Jeremie and Jones, {C. R.} and P. Jovanovic and Junk, {T. R.} and N. Kanaya and J. Kanzaki and G. Karapetian and D. Karlen and V. Kartvelishvili and K. Kawagoe and T. Kawamoto and Keeler, {R. K.} and Kellogg, {R. G.} and Kennedy, {B. W.} and Kim, {D. H.} and K. Klein and A. Klier and S. Kluth and T. Kobayashi and M. Kobel and Kokott, {T. P.} and S. Komamiya and Kowalewski, {R. V.} and T. Kr{\"a}mer and T. Kress and {von Krogh}, J. and D. Krop and T. Kuhl and M. Kupper and P. Kyberd and Lafferty, {G. D.} and H. Landsman and D. Lanske and I. Lawson and Layter, {J. G.} and A. Leins and D. Lellouch and J. Letts and L. Levinson and J. Lillich and C. Littlewood and Lloyd, {S. L.} and Loebinger, {F. K.} and J. Lu and J. Ludwig and A. Macchiolo and A. Macpherson and W. Mader and S. Marcellini and Marchant, {T. E.} and Martin, {A. J.} and Martin, {J. P.} and G. Martinez and G. Masetti and T. Mashimo and P. M{\"a}ttig and McDonald, {W. J.} and J. McKenna and McMahon, {T. J.} and McPherson, {R. A.} and F. Meijers and P. Mendez-Lorenzo and W. Menges and Merritt, {F. S.} and H. Mes and A. Michelini and S. Mihara and G. Mikenberg and Miller, {D. J.} and S. Moed and W. Mohr and T. Mori and A. Mutter and K. Nagai and I. Nakamura and Neal, {H. A.} and R. Nisius and O'Neale, {S. W.} and A. Oh and A. Okpara and Oreglia, {M. J.} and S. Orito and C. Pahl and G. P{\'a}sztor and Pater, {J. R.} and Patrick, {G. N.} and Pilcher, {J. E.} and J. Pinfold and Plane, {D. E.} and B. Poli and J. Polok and O. Pooth and A. Quadt and K. Rabbertz and C. Rembser and P. Renkel and H. Rick and N. Rodning and Roney, {J. M.} and S. Rosati and K. Roscoe and Y. Rozen and K. Runge and Rust, {D. R.} and K. Sachs and T. Saeki and O. Sahr and Sarkisyan, {E. K.G.} and Schaile, {A. D.} and O. Schaile and P. Scharff-Hansen and M. Schr{\"o}der and M. Schumacher and C. Schwick and Scott, {W. G.} and R. Seuster and Shears, {T. G.} and Shen, {B. C.} and Shepherd-Themistocleous, {C. H.} and P. Sherwood and A. Skuja and Smith, {A. M.} and Snow, {G. A.} and R. Sobie and S. S{\"o}ldner-Rembold and S. Spagnolo and F. Spano and M. Sproston and A. Stahl and K. Stephens and D. Strom and R. Str{\"u}hmer and L. Stumpf and B. Surrow and S. Tarem and M. Tasevsky and Taylor, {R. J.} and R. Teuscher and J. Thomas and Thomson, {M. A.} and E. Torrence and D. Toya and T. Trefzger and A. Tricoli and I. Trigger and Z. Tr{\'o}cs{\'a}nyi and E. Tsur and Turner-Watson, {M. F.} and I. Ueda and B. Ujv{\'a}ri and B. Vachon and Vollmer, {C. F.} and P. Vannerem and M. Verzocchi and H. Voss and J. Vossebeld and D. Waller 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 T. Wengler and N. Wermes and D. Wetterling and Wilson, {G. W.} and Wilson, {J. A.} and Wyatt, {T. R.} and S. Yamashita and V. Zacek and D. Zer-Zion",

year = "2002",

month = apr,

doi = "10.1007/s100520200926",

language = "English (US)",

volume = "23",

pages = "597--613",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer New York",

number = "4",

}

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.

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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 -

Particle multiplicity of unbiased gluon jets from e⁺e ^- three-jet events

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