Measurement of the Average B-Baryon Lifetime and the Product Branching Ratio F(b->Lambda(b))center Dot BR(Lambda(b)->Lambda L(-)Nu)over-bar-x)

R Akers,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,G Beaudoin,J Bechtluft, 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,C Burgard, R Burgin,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, OC Cooke,M Cuffiani, S Dado,C Dallapiccola, GM Dallavalle,C Darling, S DeJong, LA delPozo,H Deng, MS Dixit, EDE Silva, JE Duboscq,E Duchovni,G Duckeck, IP Duerdoth, UC Dunwoody, JEG Edwards, PG Estabrooks, HG Evans,F Fabbri,B Fabbro,M Fanti,P Fath, F Ficdler,M Fierro,M Fincke-Keeler, HM Fischer,R Folman, DG Fong,M Foucher,H Fukui, A Furtjes,P Gagnon,A Gaidot, JW Gary,J Gascon, SM GasconShotkin, NI Geddes,C GeichGimbel, SW Gensler, FX Gentit, T Geralis, G Giacomelli,P Giacomelli,R Giacomelli,V Gibson, WR Gibson, JD Gillies, DM Gingrich,J Goldberg, MJ Goodrick,W Gorn,C Grandi,E Gross, GG Hanson,M Hansroul, M Hapke, CK Hargrove,C Hartmann,M Hauschild, CM Hawkes,R Hawkings, RJ Hemingway,G Herten, RD Heuer, JC Hill, SJ Hillier,T Hilse, PR Hobson,D Hochman, RJ Homer, AK Honma,R Howard, RE HughesJones, DE Hutchcroft,P IgoKemenes, DC Imrie, D Jawahery, PW Jeffreys,H Jeremie,M Jimack,A Joly,M Jones, RWL Jones,P Jovanovic,J Kanzaki,D Karlen,K Kawagoe,T Kawamoto, RK Keeler, RG Kellogg, BW Kennedy, BJ 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,D Lanske, J Lauber, JG Layter, AM Lee,E Lefebvre,D Lellouch, J Letts,L Levinson, SL Lloyd, FK Loebinger, GD Long,B Lorazo, MJ Losty,J Ludwig,A Luig,A Malik,M Mannelli, S Marcellini,C Markus, AJ Martin, JP Martin,T Mashimo,W Matthews, P Mattig,J McKenna, EA McKigney, TJ McMahon, AI McNab,F Meijers,S Menke, FS Merritt,H Mes, A Michelini,G Mikenberg, D Miller,R Mir,W Mohr,A Montanari, T Mori,M Morii, U Muller, B Nellen, B Nijjhar, SW O'Neale, FG Oakham,F Odorici, HO Ogren, NJ Oldershaw, CJ Oram, MJ Oreglia,S Orito,F Palmonari, JP Pansart, GN Patrick, MJ Pearce, PD Phillips, JE Pilcher,J Pinfold, DE Plane,P Poffenberger, B Poli, A Posthaus, TW Pritchard,H Przysiezniak, MW Redmond, DL Rees,D Rigby, MG Rison, SA Robins,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 Scharff-Hansen,P Schenk,B Schmitt, M Schroder, HC Schultz-Coulon, M Schulz, P Schutz, J Schwiening, WG Scott, M Settles, TG Shears, BC Shen, HC Shepherd-Themistocleous, P Sherwood, GP Siroli, A Skillman, A Skuja, AM Smith, TJ Smith, GA Snow, R Sobie, S Soldner-Rembold, RW Springer, M Sproston, A Stahl, M Starks, C Stegmann, K Stephens, J Steuerer, B Stockhausen, D Strom, P Szymanski, R Tafirout, P Taras, S Tarem, M Tecchio, P Teixeira-Dias, N Tesch, MA Thomson, E vonTorne, AS Turcot, MF Turner-Watson, P Utzat, R VanKooten, G Vasseur, P Vikas, M Vincter, F Wackerle, 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, T Wlodek, G Wolf, S Wotton, TR Wyatt, G Yekutieli, V Zacek, W Zeuner, GT Zorn

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1996）

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摘要

The average lifetime of b-flavoured baryons measured with the OPAL detector is updated to include data collected between 1990 and 1994 at LEP. Bottom-flavoured baryons that decay semileptonically and produce a Lambda baryon are identified through the correlation of the baryon number of the Lambda and the electric charge of the lepton. To measure the lifetime, the decay point of the b baryon is estimated by the Lambda-lepton vertex, and the observed distribution of decay lengths is fitted simultaneously in 874 right-sign and 384 wrong-sign combinations. In a separate method, the impact parameter distribution of the leptons is fitted in a subset of these data. When the two results are combined, taking correlations into account, the average b-baryon lifetime is found to betau = 1.16 +/- 0.11 (stat.) +/- 0.06(syst.) ps.Using the same data, the product branching ratio is measured to bef(b --> Lambda(b)). BR(Lambda(b) --> Lambda l(-) nu X) = (2.9+/-0.23 (stat., +/-0.25 (syst.)). 10(-3) where the symbol f(b --> Lambda(b)) is the fraction of b quarks from Z(0) decays forming b baryons, Lambda(b) represents all b-flavoured baryons and l is either an electron or a muon.

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