A measurement of | Vcb| using [formula omitted] decays

K Ackerstaff,P Routenburg,E Tsur,A Michelini,M Jimack,S Petzold,P Berlich,C Beeston,F Strumia,W Matthews,T Tsukamoto,M Steiert,A Sittler,M Jones,K Runge,H Mes,P Gagnon,C Dallapiccola,B Stockhausen,J Pálinkás,D Lazic,J Ludwig,A Gaidot,P Scharff-Hansen,S Orito,P Bock,M Hauschild,G Giacomelli,M Bobinski,R Mir,P Taras,M Kolrep,G Yekutieli,R Bürgin,T Kress,D Axen,N Altekamp,A Posthaus,R Bartoldus,T Kobayashi,P Kyberd,A Rooke,B Nijjhar,G Duckeck,M Hansroul,T Kawamoto,K Sachs,K Stephens,P Fath,J Lauber,D Lanske,P Pfeifenschneider,F Wäckerle,M Hapke,U Jost,S Söldner-Rembold,B Poli,R Van Kooten,H Lafoux,A Jawahery,K Ametewee,J Patt,T Geralis,P Schütz,V Zacek,D Karlen,P Utzat,P Vikas,C Hartmann,M Thiergen,H Przysiezniak,E Lefebvre,M Boutemeur,B Nellen,M Foucher,M Fierro,D Chrisman,A Skillman,V Gibson,P Mättig,T Behnke,I Nakamura,C Markus,A Biguzzi,M Gruwé,S Braibant,O Schaile,F Scharf,E Do Couto E Silva,J Von Krogh,T Hilse,W Mohr,J Bechtluft,W Gorn,P Poffenberger,M Morii,J Goldberg,J Grunhaus,F Odorici,J Gascon,A Fürtjes,I Cohen,A Joly,G Vasseur,D Rigby,B Wilkens,M Rosvick,J Steuerer,R G Kellogg ,S Anderson ,T J Smith ,M Sasaki ,H Jérémie ,J A Wilson ,S Schmitt ,M G Vincter ,J R Pater ,P Giacomelli ,P Capiluppi ,G A Snow ,H M Fischer ,Robert Howard ,G Azuelos ,S Arcelli ,S Komamiya ,A N Bell ,G Alexander ,T Mäshimo ,S Kluth ,S L Lloyd ,D Lellouch ,E Gross ,P Szymański ,G D Long ,R Tafirout ,P Sherwood ,S J Hillier ,D S Koetke ,A M Lee ,S Asai ,Shun‐Ichi Tanaka ,K Nagai ,C H Shepherd-Themistocleous ,P E.l Clarke ,S Bentvelsen ,K Ishii ,M Doucet ,P Igo‐Kemenes ,H Neal ,T Mori ,Shinji Yamashita ,G Herten ,S W O’neale ,A Martín ,D Horváth ,J Letts ,F Fiedler ,H Evans ,C Sbarra ,R Nisius ,F Meijers ,K Kawagoe ,E Barberio ,E Duchovni ,J S White ,J Meyer ,J Allison ,Y Rozen ,M Schumacher ,R Folman ,M Cuffiani ,M Hildreth ,K Desch ,Ch Geich-Gimbel ,R Ryłko ,M Verzocchi ,Eckhard Von Torne ,I M Trigger ,S Marcellini ,G Mikenberg ,C Grandi ,T Shears ,C Lewis ,P Krieger ,Ö Runólfsson ,P Jovanović ,E Ros ,D Glenzinskí ,T R Wyatt ,C D Burgard ,G Bella ,Martin Ingram ,M Schröder ,R Lahmann ,M Kobel ,F Fabbri ,Meirin Oan Evans ,U Müller ,A Skuja ,G Martı́nez ,M Mannelli ,T Omori ,A Mcnab ,A Malik ,Uwe Rüppel ,J L Pinfold ,R Keeler ,A Stahl ,P Schenk ,A Wagner ,N Wermes ,M Schulz ,P R Hobson ,J Kirk ,D G Charlton ,D Strom ,S Bethke ,D J Miller ,A H Ball ,J R Batley ,A Montanari ,G Wolf ,P A Hart ,S Tarem ,L J Levinson ,H.‐C Schultz‐Coulon ,S Menke ,M Herndon ,S Dado ,G Pásżtor ,G Hanson ,B J King ,H Burckhart ,R Sobie ,V Blobel ,B Bouwens ,N Rodning ,O Biebel ,S Towers ,C Hajdú ,G Jones ,R A Mcpherson ,E K.g Sarkisyan ,G W Wilson ,B Schmitt ,M J Pearce ,J E Conboy ,R E Hughes-Jones ,A K Honma ,D L Rees ,I J Bloodworth ,C R Jones ,C Y Chang ,P M Watkins ,A M Smith ,R M Brown ,S D Talbot ,D R Ward ,W G Scott ,C M Hawkes ,E A Mckigney ,R J Homer ,J R Carter ,R J Barlow ,T R Junk ,D E Hutchcroft ,P G Estabrooks ,D M Gingrich ,J E Bloomer ,N K Watson ,C P Ward ,G M Dallavalle ,J J Ward ,M J Goodrick ,M A Thomson ,S A Robins ,J G Layter ,A T Watson ,F K Loebinger ,G N Patrick ,R D Heuer ,F S Merritt ,A S Turcot ,H M Bosch ,J E.g Edward ,S H Robertson ,B C Shen ,Roger Jones ,J A Mckenna ,N J Oldershaw ,J E Pilcher ,M S Proston ,D G Fong ,P W Jeffreys ,A A Carter ,Lp Duerdoth ,K W Bell ,F X Gentit ,D C Imrie ,R W Springer ,M F Turner-Watson ,F G Oakham ,H O Ogren ,J C Hill ,O C Cooke ,J W Gary ,J P Martin ,N I Geddes ,W R Gibson ,C K Hargrove ,J M Roney ,S R Lautenschlager ,A M Rossi ,S J De Jong ,L A Del Pozo ,G P Siroli ,S M Gascon-Shotkin ,S A Wotton ,B W Kennedy ,R K Carnegie ,D R Rust ,P S Wells ,D E Plane ,A D Schaile ,K J Anderson ,W P Lai ,G D Lafferty ,R J Hemingway ,M S Dixit ,M J Oreglia ,Roberto Giacomelli ,T P Kokott ,W J Mcdonald ,T J Mcmahon ,E H Vokurka ,M J Losty ,R J Hawkings

doi:10.1016/s0370-2693(97)00056-7

Abstract

We report a measurement of the Cabibbo-Kobayashi-Maskawa matrix element | V cb|. From approximately 4.2 million hadronic Z 0 decays recorded with the OPAL deteector, a sample is selected containing 1251 ± 125 B 0 → D ∗+ℓ − ν ℓ candidates, where ℓ is either an electron or a muon. Using Heavy Quark Effective Theory calculations for the decay form factor at zero recoil of the D ∗+ meson in the B 0 rest frame, we derive | V cb| = [36.0 ± 2.1 (stat) ± 2.4 (syst) ± 1.2 (theory)] × 10 −3.

Full Text