The Scale Dependence of the Hadron Multiplicity in Quark and Gluon Jets and a Precise Determination of CA/CF
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The Scale Dependence of the Hadron Multiplicity in Quark and Gluon Jets and a Precise Determination of CA/CF

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The Scale Dependence of the Hadron Multiplicity in Quark and Gluon Jets and a Precise Determination of CA/CF

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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana Perfil; Castillo Giménez, María Victoria Perfil; Cortina Gil, Eduardo; Ferrer Soria, Antonio Perfil; Fuster Verdú, Juan A. Perfil; García García, Carmen Perfil; Gil Botella, Inés; Hernández Rey, Juan José Perfil; Higón Rodríguez, Emilio Perfil; Martínez Vidal, Fernando Perfil; Navas Concha, Sergio; Salt Cairols, José Perfil
Aquest document és un/a article, creat/da en: 1999

Este documento está disponible también en : http://dx.doi.org/10.1016/S0370-2693(99)00112-4
Data collected at the Z resonance using the DELPHI detector at LEP are used to determine the charged hadron multiplicity in gluon and quark jets as a function of a transverse momentum-like scale. The colour factor ratio, \cacf, is directly observed in the increase of multiplicities with that scale. The smaller than expected multiplicity ratio in gluon to quark jets is understood by differences in the hadronization of the leading quark or gluon. From the dependence of the charged hadron multiplicity on the opening angle in symmetric three-jet events the colour factor ratio is measured to be: C_A/C_F = 2.246 \pm 0.062 (stat.) \pm 0.080 (syst.) \pm 0.095 (theo.)

    DELPHI Collaboration Alemany, R. Cabrera Urbán, Susana Castillo Giménez, María Victoria Cortina, E. Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gil, I. Hernández Rey, Juan José Higón Rodríguez, Emilio Martínez Vidal, Fernando Navas, S. Salt Cairols, José 1999 The Scale Dependence of the Hadron Multiplicity in Quark and Gluon Jets and a Precise Determination of CA/CF Physics Letters B 449 383 400
http://dx.doi.org/10.1016/10.1016/S0370-2693(99)00112-4
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