Charged particle multiplicities in heavy and light quark initiated events above the Z0 peak

Charged particle multiplicities in heavy and light quark initiated events above the Z0 peak

Giovanni Abbiendi,C Ainsley,P.F Åkesson,G Alexander,J Allison,P Amaral,G Anagnostou,K.J Anderson,S Arcelli,S Asai,D Axen,G Azuelos,Ian Bailey,E Barberio,Roger Barlow,R.J Batley,P Bechtle,T Behnke,K.W Bell,P.J Bell,Gideon Bella,A Bellerive,G Benelli,S Bethke,O Biebel,I.J Bloodworth,O Boeriu,P Bock,D Bonacorsi,M Boutemeur,S Braibant,L Brigliadori,R.M Brown,Karsten Buesser,H.J Burckhart,S Campana,R.K Carnegie,B Caron,A.A Carter,J.R Carter,C.Y Chang,D.G Charlton,A Csilling,M Cuffiani,S Dado,S Dallison,A De Roeck,E.A De Wolf,K Desch,B Dienes,M Donkers,J Dubbert,E Duchovni,G Duckeck,I.P Duerdoth,E Elfgren,E Etzion,F Fabbri,Lutz Feld,P Ferrari,F Fiedler,I Fleck,M Ford,A Frey,A Fürtjes,P Gagnon,J.W Gary,G Gaycken,C Geich-Gimbel,G Giacomelli,M Giunta,J Goldberg,E Gross,J Grunhaus,M Gruwé,P.O Günther,A Gupta,C Hajdu,M Hamann,G.G Hanson,K Harder,A Harel,M Harin-Dirac,M Hauschild,J Hauschildt,Christopher Hawkes,R Hawkings,R.J Hemingway,C Hensel,G Herten,R.D Heuer,J.C Hill,K Hoffman,R.J Homer,D Horváth,R Howard,P Igo-Kemenes,K Ishii,H Jeremie,P Jovanovic,T.R Junk,N Kanaya,J Kanzaki,G Karapetian,Dean 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,S Komamiya,L Kormos,T Krämer,T Kress,P Krieger,J von Krogh,D Krop,K Kruger,T Kuhl,M Kupper,George Lafferty,H Landsman,D Lanske,J.G Layter,A Leins,D Lellouch,J Letts,L Levinson,J Lillich,S.L Lloyd,F.K Loebinger,J Lu,J Ludwig,A Macpherson,W Mader,S Marcellini,T.E Marchant,A.J Martin,J.P Martin,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,Satoshi 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,Gabriella Pásztor,J.R Pater,G.N Patrick,J.E Pilcher,J Pinfold,D.E Plane,B Poli,J Polok,O Pooth,Mariusz Przybycien,A Quadt,Klaus Rabbertz,C Rembser,P Renkel,H Rick,J.M Roney,S Rosati,Y Rozen,K Runge,Kirsten Sachs,T Saeki,O Sahr,E.K.G Sarkisyan,A.D Schaile,O Schaile,P Scharff-Hansen,J Schieck,T Schörner-Sadenius,M Schröder,M Schumacher,C Schwick,W.G Scott,R Seuster,Tara Shears,B.C Shen,P Sherwood,G Siroli,A Skuja,A.M Smith,R Sobie,Stefan Soldner-Rembold,F Spano,Achim Stahl,K Stephens,D Strom,R Ströhmer,S Tarem,M Tasevsky,R.J Taylor,R Teuscher,M.A Thomson,E Torrence,D Toya,P Tran,T Trefzger,A Tricoli,I Trigger,Z Trócsányi,E Tsur,Miriam 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,Peter Watkins,A.T Watson,Nigel Watson,P.S Wells,T Wengler,N Wermes,D Wetterling,Graham Wilson,J.A Wilson,G Wolf,T.R Wyatt,S Yamashita,D Zer-Zion,L Zivkovic;Giovanni Abbiendi;C Ainsley;P.F Åkesson;G Alexander;J Allison;P Amaral;G Anagnostou;K.J Anderson;S Arcelli;S Asai;D Axen;G Azuelos;Ian Bailey;E Barberio;Roger Barlow;R.J Batley;P Bechtle;T Behnke;K.W Bell;P.J Bell;Gideon Bella;A Bellerive;G Benelli;S Bethke;O Biebel;I.J Bloodworth;O Boeriu;P Bock;D Bonacorsi;M Boutemeur;S Braibant;L Brigliadori;R.M Brown;Karsten Buesser;H.J Burckhart;S Campana;R.K Carnegie;B Caron;A.A Carter;J.R Carter;C.Y Chang;D.G Charlton;A Csilling;M Cuffiani;S Dado;S Dallison;A De Roeck;E.A De Wolf;K Desch;B Dienes;M Donkers;J Dubbert;E Duchovni;G Duckeck;I.P Duerdoth;E Elfgren;E Etzion;F Fabbri;Lutz Feld;P Ferrari;F Fiedler;I Fleck;M Ford;A Frey;A Fürtjes;P Gagnon;J.W Gary;G Gaycken;C Geich-Gimbel;G Giacomelli;M Giunta;J Goldberg;E Gross;J Grunhaus;M Gruwé;P.O Günther;A Gupta;C Hajdu;M Hamann;G.G Hanson;K Harder;A Harel;M Harin-Dirac;M Hauschild;J Hauschildt;Christopher Hawkes;R Hawkings;R.J Hemingway;C Hensel;G Herten;R.D Heuer;J.C Hill;K Hoffman;R.J Homer;D Horváth;R Howard;P Igo-Kemenes;K Ishii;H Jeremie;P Jovanovic;T.R Junk;N Kanaya;J Kanzaki;G Karapetian;Dean 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;S Komamiya;L Kormos;T Krämer;T Kress;P Krieger;J von Krogh;D Krop;K Kruger;T Kuhl;M Kupper;George Lafferty;H Landsman;D Lanske;J.G Layter;A Leins;D Lellouch;J Letts;L Levinson;J Lillich;S.L Lloyd;F.K Loebinger;J Lu;J Ludwig;A Macpherson;W Mader;S Marcellini;T.E Marchant;A.J Martin;J.P Martin;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;Satoshi 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;Gabriella Pásztor;J.R Pater;G.N Patrick;J.E Pilcher;J Pinfold;D.E Plane;B Poli;J Polok;O Pooth;Mariusz Przybycien;A Quadt;Klaus Rabbertz;C Rembser;P Renkel;H Rick;J.M Roney;S Rosati;Y Rozen;K Runge;Kirsten Sachs;T Saeki;O Sahr;E.K.G Sarkisyan;A.D Schaile;O Schaile;P Scharff-Hansen;J Schieck;T Schörner-Sadenius;M Schröder;M Schumacher;C Schwick;W.G Scott;R Seuster;Tara Shears;B.C Shen;P Sherwood;G Siroli;A Skuja;A.M Smith;R Sobie;Stefan Soldner-Rembold;F Spano;Achim Stahl;K Stephens;D Strom;R Ströhmer;S Tarem;M Tasevsky;R.J Taylor;R Teuscher;M.A Thomson;E Torrence;D Toya;P Tran;T Trefzger;A Tricoli;I Trigger;Z Trócsányi;E Tsur;Miriam 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;Peter Watkins;A.T Watson;Nigel Watson;P.S Wells;T Wengler;N Wermes;D Wetterling;Graham Wilson;J.A Wilson;G Wolf;T.R Wyatt;S Yamashita;D Zer-Zion;L Zivkovic;
physics letters b 2002 Vol. 550 pp. 33-46
186
zivkovic2002physicscharged

Abstract

We have measured the mean charged particle multiplicities separately for bb̄, cc̄ and light quark (uū,dd̄,ss̄) initiated events produced in e+e− annihilations at LEP. The data were recorded with the OPAL detector at eleven different energies above the Z0 peak, corresponding to the full statistics collected at LEP1.5 and LEP2. The difference in mean charged particle multiplicities for bb̄ and light quark events, δbl, measured over this energy range is consistent with an energy independent behaviour, as predicted by QCD, but is inconsistent with the prediction of a more phenomenological approach which assumes that the multiplicity accompanying the decay of a heavy quark is independent of the quark mass itself. Our results, which can be combined into the single measurement δbl=3.44±0.40(stat)±0.89(syst) at a luminosity weighted average centre-of-mass energy of 195 GeV, are also consistent with an energy independent behaviour as extrapolated from lower energy data.

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