Test of QCD analytic predictions for the multiplicity ratio between gluon and quark jets

G Alexander; J Allison; N Altekamp; K Ametewee; KJ Anderson; S Anderson; S Arcelli; S Asai; D Axen; G Azuelos; AH Ball; E Barberio; RJ Barlow; R Bartoldus; JR Batley; J Bechtluft; C Beeston; T Behnke; AN Bell; KW Bell; G Bella; S Bentvelsen; P Berlich; S Bethke; O Biebel; V Blobel; IJ Bloodworth; JE Bloomer; M Bobinski; P Bock; HM Bosch; M Boutemeur; BT Bouwens; S Braibant; RM Brown; HJ Burckhart; C Burgard; R Bürgin; P Capiluppi; RK Carnegie; AA Carter; JR Carter; CY Chang; C Charlesworth; DG Charlton; D Chrisman; SL Chu; PEL Clarke; I Cohen; JE Conboy; OC Cooke; M Cuffiani; S Dado; C Dallapiccola; GM Dallavalle; S de Jong; LA del Pozo; K Desch; MS Dixit; E do Couto e Silva; M Doucet; E Duchovni; G Duckeck; IP Duerdoth; JEG Edwards; PG Estabrooks; HG Evans; M Evans; F Fabbri; P Fath; F Fiedler; M Fierro; HM Fischer; R Folman; DG Fong; M Foucher; A Fürtjes; P Gagnon; A Gaidot; JW Gary; J Gascon; SM Gascon-Shotkin; NI Geddes; C Geich-Gimbel; FX Gentit; T Geralis; G Giacomelli; P Giacomelli; R Giacomelli; V Gibson; WR Gibson; DM Gingrich; D Glenzinski; J Goldberg; MJ Goodrick; W Gorn; C Grandi; E Gross; M Gruwé; C Hajdu

Journal article

Test of QCD analytic predictions for the multiplicity ratio between gluon and quark jets

G Alexander, J Allison, N Altekamp, K Ametewee, KJ Anderson, S Anderson, S Arcelli, S Asai, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, J Bechtluft, C Beeston, T Behnke, AN Bell, KW Bell Show all

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | ELSEVIER SCIENCE BV | Published : 1996

DOI: 10.1016/S0370-2693(96)01319-6

Abstract

Gluon jets with about 39 GeV energy are identified in hadronic Z0 decays by tagging two jets in the same hemisphere of an event as quark jets. Identifying the gluon jet to be all the particles observed in the hemisphere opposite to that containing the two tagged jets yields an inclusive gluon jet definition corresponding to that used in analytic calculations, allowing the first direct test of those calculations. In particular, this jet definition yields results which are only weakly dependent on a jet finding algorithm. We find rch. = 1.552 ± 0.041 (stat.) ± 0.061 (syst.) for the ratio of the mean charged particle multiplicity in gluon jets to that in light quark uds jets, where the uds jets..

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