Production of Ds mesons in hadronic Z decays

The production rates of the orbitally excited Ds** mesons, Ds1 and Ds2*, are measured with the 4.1 million hadronic Z decays recorded by the ALEPH detector during 1991--1995. The Ds** mesons are reconstructed in the decay modes Ds1+ -> D*+ K0, Ds1+ -> D*0

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002 ceD 7 1v010211/0ex-pe:hviXraEUROPEANORGANIZATIONFORNUCLEARRESEARCH

CERN–EP/2001–08528thNovember2001

ProductionofD smesonsinhadronicZdecays

TheALEPHCollaboration

1

Abstract

TheproductionratesoftheorbitallyexcitedD ± ±

millionhadronicZdecaysrecordedsmesons,Dbythes1andDALEPHs2,aremeasuredwiththe4.1detector1991–1995.TheD D+ 0s mesons+during

+0+arereconstructedinthedecaymodesDs1s1→D±K+andDs2→D0K+.TheproductionrateoftheD±s1ismeasured→DK,

tobe

f(Z→Ds1)=(0.52±0.09±0.06)%,undertheassumptionthatthetwoconsidereddecaymodesoftheD±D ±

s1saturatethebranchingratio.Theproductions2isdeterminedtobef(Z→D ±+0.07rateofthe

branchingfractionofthedecayD +s2)=(0.83±0.29 0.13)%,assumingthatthe

s2→D0K

+is45%.TheproductionratesinZ→cbdecaysaremeasuredseparately.

(submittedtoPhys.Lett.)

The production rates of the orbitally excited Ds** mesons, Ds1 and Ds2*, are measured with the 4.1 million hadronic Z decays recorded by the ALEPH detector during 1991--1995. The Ds** mesons are reconstructed in the decay modes Ds1+ -> D*+ K0, Ds1+ -> D*0

TheALEPHCollaboration

A.Heister,S.Schael

PhysikalischesInstitutdasRWTH-Aachen,D-52056Aachen,Germany

R.Barate,I.DeBonis,D.Decamp,C.Goy,J.-P.Lees,E.Merle,M.-N.Minard,B.Pietrzyk

LaboratoiredePhysiquedesParticules(LAPP),IN2P3-CNRS,F-74019Annecy-le-VieuxCedex,France

G.Boix,S.Bravo,M.P.Casado,M.Chmeissani,J.M.Crespo,E.Fernandez,M.Fernandez-Bosman,Ll.Garrido,15E.Graug´es,M.Martinez,G.Merino,R.Miquel,27Ll.M.Mir,27A.Pacheco,H.RuizInstitutdeF´isicad’AltesEnergies,UniversitatAut`onomadeBarcelona,E-08193Bellaterra

7

(Barcelona),Spain

A.Colaleo,D.Creanza,M.dePalma,G.Iaselli,G.Maggi,M.Maggi,S.Nuzzo,A.Ranieri,G.Raso,23F.Ruggieri,G.Selvaggi,L.Silvestris,P.Tempesta,A.Tricomi,3G.ZitoDipartimentodiFisica,INFNSezionediBari,I-70126Bari,Italy

X.Huang,J.Lin,Q.Ouyang,T.Wang,Y.Xie,R.Xu,S.Xue,J.Zhang,L.Zhang,W.ZhaoInstituteofHighEnergyPhysics,AcademiaSinica,Beijing,ThePeople’sRepublicofChina8

D.Abbaneo,P.Azzurri,O.Buchm¨uller,25M.Cattaneo,F.Cerutti,B.Clerbaux,H.Drevermann,R.W.Forty,M.Frank,F.Gianotti,T.C.Greening,29J.B.Hansen,J.Harvey,D.E.Hutchcroft,P.Janot,B.Jost,M.Kado,27P.Mato,A.Moutoussi,F.Ranjard,L.Rolandi,D.Schlatter,O.Schneider,2G.Sguazzoni,W.Tejessy,F.Teubert,A.Valassi,I.Videau,J.Ward

EuropeanLaboratoryforParticlePhysics(CERN),CH-1211Geneva23,Switzerland

F.Badaud,A.Falvard,22P.Gay,P.Henrard,J.Jousset,B.Michel,S.Monteil,J-C.Montret,D.Pallin,P.Perret

LaboratoiredePhysiqueCorpusculaire,Universit´eBlaisePascal,IN2P3-CNRS,Clermont-Ferrand,F-63177Aubi`ere,FranceJ.D.Hansen,J.R.Hansen,P.H.Hansen,B.S.Nilsson,A.W¨aa¨n¨anenNielsBohrInstitute,DK-2100Copenhagen,Denmark9

A.Kyriakis,C.Markou,E.Simopoulou,A.Vayaki,K.Zachariadou

NuclearResearchCenterDemokritos(NRCD),GR-15310Attiki,Greece

A.Blondel,12G.Bonneaud,J.-C.Brient,A.Roug´e,M.Rumpf,M.Swynghedauw,M.Verderi,H.Videau

LaboratoiredePhysiqueNucl´eaireetdesHautesEnergies,EcolePolytechnique,IN2P3-CNRS,F-91128PalaiseauCedex,France

V.Ciulli,E.Focardi,G.ParriniDipartimentodiFisica,Universit`adiFirenze,INFNSezionediFirenze,I-50125Firenze,ItalyA.Antonelli,M.Antonelli,G.Bencivenni,G.Bologna,4F.Bossi,P.Campana,G.Capon,V.Chiarella,http://doc.guandang.neturelli,G.Mannocchi,5F.Murtas,G.P.Murtas,L.Passalacqua,M.Pepe-Altarelli,24P.SpagnoloLaboratoriNazionalidell’INFN(LNF-INFN),I-00044Frascati,ItalyA.Halley,J.G.Lynch,P.Negus,V.O’Shea,C.Raine,4A.S.Thompson

DepartmentofPhysicsandAstronomy,UniversityofGlasgow,GlasgowG128QQ,UnitedKingdom10S.Wasserbaech

DepartmentofPhysics,HaverfordCollege,Haverford,PA19041-1392,U.S.A.

R.Cavanaugh,S.Dhamotharan,C.Geweniger,P.Hanke,G.Hansper,V.Hepp,E.E.Kluge,A.Putzer,J.Sommer,K.Tittel,S.Werner,19M.Wunsch19

Kirchho -Institutf¨urPhysik,Universit¨atHeidelberg,D-69120Heidelberg,Germany16

R.Beuselinck,D.M.Binnie,W.Cameron,P.J.Dornan,M.Girone,1N.Marinelli,J.K.Sedgbeer,

The production rates of the orbitally excited Ds** mesons, Ds1 and Ds2*, are measured with the 4.1 million hadronic Z decays recorded by the ALEPH detector during 1991--1995. The Ds** mesons are reconstructed in the decay modes Ds1+ -> D*+ K0, Ds1+ -> D*0

J.C.Thompson14

DepartmentofPhysics,ImperialCollege,LondonSW72BZ,UnitedKingdom10V.M.Ghete,P.Girtler,E.Kneringer,D.Kuhn,G.Rudolph

Institutf¨urExperimentalphysik,Universit¨atInnsbruck,A-6020Innsbruck,Austria18

E.Bouhova-Thacker,C.K.Bowdery,A.J.Finch,F.Foster,G.Hughes,R.W.L.Jones,M.R.Pearson,N.A.Robertson

DepartmentofPhysics,UniversityofLancaster,LancasterLA14YB,UnitedKingdom10K.Jakobs,K.Kleinknecht,G.Quast,6B.Renk,H.-G.Sander,H.Wachsmuth,C.ZeitnitzInstitutf¨urPhysik,Universit¨atMainz,D-55099Mainz,Germany16

A.Bonissent,J.Carr,P.Coyle,O.Leroy,P.Payre,D.Rousseau,M.TalbyCentredePhysiquedesParticules,Universit´edelaM´editerran´ee,IN2P3-CNRS,F-13288Marseille,France

F.Ragusa

DipartimentodiFisica,Universit`adiMilanoeINFNSezionediMilano,I-20133Milano,ItalyA.David,H.Dietl,G.Ganis,26K.H¨uttmann,G.L¨utjens,C.Mannert,W.M¨anner,H.-G.Moser,R.Settles,H.Stenzel,W.Wiedenmann,G.Wolf

Max-Planck-Institutf¨urPhysik,Werner-Heisenberg-Institut,D-80805M¨unchen,Germany16

J.Boucrot,O.Callot,M.Davier,L.Du ot,J.-F.Grivaz,Ph.Heusse,A.Jacholkowska,22J.Lefran¸cois,J.-J.Veillet,C.YuanLaboratoiredel’Acc´el´erateurLin´eaire,Universit´edeParis-Sud,IN2P3-CNRS,F-91898OrsayCedex,Fra …… 此处隐藏：25314字，全部文档内容请下载后查看。喜欢就下载吧 ……