A Measurement Of The Production Of D-Asterisk(+/-) Mesons On The Z(0) Resonance

R Akers, G Alexander,J Allison, K Ametewee,Kj Anderson, S Arcelli, S Asai, A Astbury, D Axen,G Azuelos,Ah Ball, E Barberio,Rj Barlow, R Bartoldus, Jr Batley, G Beaudoin, A Beck,Ga Beck, C Beeston,T Behnke,Kw Bell,G Bella, S Bentvelsen, P Berlich,S Bethke, O Biebel, Ij Bloodworth, P Bock, Hm Bosch, M Boutemeur,S Braibant, P Brightthomas,Rm Brown, A Buijs,Hj Burckhart,R Burgin, C Burgard, N Capdevielle, P Capiluppi,Rk Carnegie,Aa Carter,Jr Carter,Cy Chang,C Charlesworth, Dg Charlton,Sl Chu,Pel Clarke, Jc Clayton,Sg Clowes, I Cohen,Je Conboy, M Cuffiani, S Dado, C Dallapiccola,Gm Dallavalle,C Darling, S Dejong, La Delpozo,H Deng, M Dittmar,Ms Dixit,Ede Silva,Je Duboscq, E Duchovni, G Duckeck,Ip Duerdoth,Uc Dunwoody, Pa Elcombe, Pg Estabrooks, E Etzion, Hg Evans,F Fabbri,B Fabbro,M Fanti, P Fath, M Fierro,M Finckekeeler,Hm Fischer,P Fischer, R Folman,Dg Fong, M Foucher,H Fukui, A Furtjes,P Gagnon, A Gaidot,Jw Gary,J Gascon,Ni Geddes,C Geichgimbel, Sw Gensler,Fx Gentit, T Geralis, G Giacomelli,P Giacomelli, R Giacomelli, V Gibson,Wr Gibson, Jd Gillies,J Goldberg,Dm Gingrich,Mj Goodrick, W Gorn,C Grandi, E Gross, J Hagermann, Gg Hanson, M Hansroul,Ck Hargrove,Pa Hart,M Hauschild,Cm Hawkes, E Heflin,Rj Hemingway, G Herten,Rd Heuer,Jc Hill, Sj Hillier, T Hilse,Pr Hobson,D Hochman, A Hocker,Rj Homer, Ak Honma,R Howard,Re Hughesjones, P Igokemenes, Dc Imrie, A Jawahery, Pw Jeffreys, H Jeremie, M Jimack,M Jones, Rwl Jones, P Jovanovic, C Jui,D Karlen, J Kanzaki,K Kawagoe, T Kawamoto, Rk Keeler,Rg Kellogg,Bw Kennedy,B King,J King,J Kirk, S Kluth, T Kobayashi, M Kobel,Ds Koetke, Tp Kokott, S Komamiya, R Kowalewski, T Kress,P Krieger, J Vonkrogh,P Kyberd,Gd Lafferty, H Lafoux, R Lahmann, Wp Lai, J Lauber,Jg Layter,P Leblanc,P Ledu,Am Lee,E Lefebvre, D Lellouch,C Leroy, J Letts,L Levinson,Z Li, F Liu,Sl Lloyd,Fk Loebinger,Gd Long, B Lorazo,Mj Losty,Xc Lou, J Ludwig, A Luig, M Mannelli, S Marcellini,C Markus,Aj Martin,Jp Martin, T Mashimo,W Matthews, P Mattig, U Maur,J Mckenna,Tj Mcmahon,Ai Mcnab, F Meijers,Fs Merritt, H Mes, A Michelini,Rp Middleton, G Mikenberg,Dj Miller,R Mir, W Mohr,A Montanari, T Mori,M Morii,U Muller, B Nellen, B Nijjhar,Sw Oneale,Fg Oakham, F Odorici, Ho Ogren,Cj Oram,Mj Oreglia, S Orito,Jp Pansart,Gn Patrick,Mj Pearce, Pd Phillips,Je Pilcher, J Pinfold, D Pitman, De Plane, P Poffenberger, B Poli, A Posthaus,Tw Pritchard, H Przysiezniak,Mw Redmond,Dl Rees,D Rigby,Mg Rison,Sa Robins, D Robinson,N Rodning,Jm Roney,E Ros,Am Rossi, M Rosvick, P Routenburg, Y Rozen, K Runge, O Runolfsson,Dr Rust,M Sasaki,C Sbarra, Ad Schaile,O Schaile, F Scharf, P Scharffhansen,P Schenk,B Schmitt,M Schroder,Hc Schultzcoulon,P Schutz,M Schulz, C Schwick, J Schwiening,Wg Scott, M Settles,Tg Shears,Bc Shen,Ch Shepherdthemistocleous, P Sherwood,Gp Siroli, A Skillman, A Skuja,Am Smith,Tj Smith,Ga Snow, R Sobie,S Soldnerrembold,Rw Springer, M Sproston,A Stahl, M Starks, C Stegemann,K Stephens,J Steurer, B Stockhausen, D Strom, P Szymanski, R Tafirout,H Takeda,T Takeshita,P Taras, S Tarem, M Tecchio, P Teixeiradias,N Tesch,Ma Thomson, O Tousignant, S Towers, M Tscheulin, T Tsukamoto, A Turcot,Mf Turnerwatson, P Utzat, R Vankooten, G Vasseur,P Vikas,M Vincter, A Wagner,Dl Wagner, Cp Ward, Dr Ward,Jj Ward,Pm Watkins,At Watson,Nk Watson, P Weber,Ps Wells, N Wermes, B Wilkens,Gw Wilson,Ja Wilson, Vh Winterer, T Wlodek,G Wolf, S Wotton,Tr Wyatt, A Yeaman, G Yekutieli, M Yurko, V Zacek, W Zeuner,Gt Zorn

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1995）

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摘要

We have studied the production of D*(+/-) mesons in a sample of 1,25 million multihadronic decays of the Z(0), in which 1969 candidates have been identified. We have determined the total multiplicity of charged D* mesons in multihadronic Z(0) decays to be(n) over bar)(Z0-->D*+/-X) = 0.183 +/- 0.009(stat) +/- 0.007(sys) +/-0.008(ext).The last error is due to branching ratios external to this analysis.Decays of c-quarks are separated from those of b-quarks by a combination of bottom tagging methods using leptons, jet shape variables, and lifetime information. From this we findGamma(Z(0) --> )/Gamma(Z(0) --> hadrons) = 0.142 +/- 0.008(stat) +/- 0.009(sys) +/- 0.011(ext).We measure the mean scaled energy of D*(+/-) mesons in primary charm events to be[x(c-->D*+/-)] = 0.515(-0.005)(+0.008)(stat) +/- 0.010(sys).Studying D* production at very low x(D)* we find indications for production from gluon splitting and measure the mean multiplicity of this process in multihadronic Z(0) decays to be(n) over bar(g-->) = 0.044 +/- 0.014(stat) +/- 0.015(sys),assuming the Standard Model prediction for Gamma()/Gamma(had). By comparing our observed D* mean scaled energy with measurements at lower energies we find evidence for scaling violations.

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