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The Scale dependence of the hadron multiplicity in quark and gluon jets and a precise determination of C(A)/C(F)

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Abreu, P. [--] Cortina Gil, Eduardo [UCL] DELPHI Collaboration [--]

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, CA/CF , 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: CA/CF= 2.246 ± 0.062 (stat.) ± 0.080 (syst.) ± 0.095 (theo.)

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 1999
Language Anglais
Journal information "Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics" - Vol. 449, no.3-4, p. 383–400 (1999)
Peer reviewed yes
Publisher Elsevier BV * North-Holland ((Netherlands) Amsterdam)
issn 0370-2693
e-issn 1873-2445
Publication status Publié
Affiliation UCL - SST/IRMP - Institut de recherche en mathématique et physique
Links
Bibliographic reference Abreu, P. ; Cortina Gil, Eduardo ; DELPHI Collaboration ; et. al. The Scale dependence of the hadron multiplicity in quark and gluon jets and a precise determination of C(A)/C(F) . In: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 449, no.3-4, p. 383–400 (1999)
Permanent URL http://hdl.handle.net/2078.1/123115