6533b858fe1ef96bd12b6d42

RESEARCH PRODUCT

Determination of |Vub|/|Vcb| with DELPHI at LEP

P. AbreuW. AdamT. AdyeP. AdzicZ. AlbrechtT. AlderweireldG.d. AlekseevR. AlemanyT. AllmendingerP.p. AllportS. AlmehedU. AmaldiN. AmapaneS. AmatoE.g. AnassontzisP. AnderssonA. AndreazzaS. AndringaP. AntilogusW-d. ApelY. ArnoudB. ÅSmanJ-e. AugustinA. AugustinusP. BaillonP. BambadeF. BaraoG. BarbielliniR. BarbierD.y. BardinG. BarkerA. BaroncelliM. BattagliaM. BaubillierK-h. BecksM. BegalliA. BehrmannP. BeilliereYu. BelokopytovK. BelousN.c. BenekosA.c. BenvenutiC. BeratM. BerggrenD. BertrandM. BesanconM. BigiM.s. BilenkyM-a. BizouardD. BlochH.m. BlomM. BonesiniM. BoonekampP.s.l. BoothA.w. BorglandG. BorisovC. BosioO. BotnerE. BoudinovB. BouquetC. BourdariosT.j.v. BowcockI. BoykoI. BozovicM. BozzoM. BrackoP. BranchiniR.a. BrennerP. BruckmanJ-m. BrunetL. BuggeT. BuranB. BuschbeckP. BuschmannS. CabreraM. CacciaM. CalviT. CamporesiV. CanaleF. CarenaL. CarrollC. CasoM.v. Castillo GimenezA. CattaiF.r. CavalloV. ChabaudM. ChapkinPh. CharpentierP. ChecchiaG.a. ChelkovR. ChiericiP. ChliapnikovP. ChochulaV. ChorowiczJ. ChudobaK. CieslikP. CollinsR. ContriE. CortinaG. CosmeF. CossuttiH.b. CrawleyD. CrennellS. CrepeG. CrosettiJ. Cuevas MaestroS. CzellarM. DavenportW. Da SilvaG. Della RiccaP. DelpierreN. DemariaA. De AngelisW. De BoerC. De ClercqB. De LottoA. De MinL. De PaulaH. DijkstraL. Di CiaccioJ. DolbeauK. DorobaM. DracosJ. DreesM. DrisA. DuperrinJ-d. DurandG. EigenT. EkelofG. EkspongM. EllertM. ElsingJ-p. EngelM. Espirito SantoG. FanourakisD. FassouliotisJ. FayotM. FeindtA. FerrerE. Ferrer-ribasF. FerroS. FichetA. FirestoneU. FlagmeyerH. FoethE. FokitisF. FontanelliB. FranekA.g. FrodesenR. FruhwirthF. Fulda-quenzerJ. FusterA. GalloniD. GambaS. GamblinM. GandelmanC. GarciaC. GasparM. GasparU. GaspariniPh. GavilletE.n. GazisD. GeleN. GhodbaneI. GilF. GlegeR. GokieliB. GolobG. Gomez-ceballosP. GoncalvesI. Gonzalez CaballeroG. GopalL. GornYu. GouzV. GraccoJ. GrahlE. GrazianiP. GrisG. GrosdidierK. GrzelakJ. GuyC. HaagF. HahnS. HahnS. HaiderA. HallgrenK. HamacherJ. HansenF.j. HarrisV. HedbergS. HeisingJ.j. HernandezP. HerquetH. HerrT.l. HessingJ.-m. HeuserE. HigonS-o. HolmgrenP.j. HoltS. HoorelbekeM. HouldenJ. HrubecM. HuberK. HuetG.j. HughesK. HultqvistJ.n. JacksonR. JacobssonP. JalochaR. JanikCh. JarlskogG. JarlskogP. JarryB. Jean-marieD. JeansE.k. JohanssonP. JonssonC. JoramP. JuillotL. JungermannF. KapustaK. KarafasoulisS. KatsanevasE.c. KatsoufisR. KeranenG. KernelB.p. KersevanB.a. KhomenkoN.n. KhovanskiA. KiiskinenB. KingA. KinvigN.j. KjaerO. KlappH. KleinP. KluitP. KokkiniasV. KostioukhineC. KourkoumelisO. KouznetsovM. KrammerE. KriznicZ. KrumsteinP. KubinecJ. KurowskaK. KurvinenJ.w. LamsaD.w. LaneV. LapinJ-p. LaugierR. LauhakangasG. LederF. LedroitV. LefebureL. LeinonenA. LeisosR. LeitnerG. LenzenV. LepeltierT. LesiakM. LethuillierJ. LibbyW. LiebigD. LikoA. LipniackaI. LippiB. LoerstadJ.g. LokenJ.h. LopesJ.m. LopezR. Lopez-fernandezD. LoukasP. LutzL. LyonsJ. MacnaughtonJ.r. MahonA. MaioA. MalekT.g.m. MalmgrenS. MaltezosV. MalychevF. MandlJ. MarcoR. MarcoB. MarechalM. MargoniJ-c. MarinC. MariottiA. MarkouC. Martinez-riveroF. Martinez-vidalS. Marti I GarciaJ. MasikN. MastroyiannopoulosF. MatorrasC. MatteuzziG. MatthiaeF. MazzucatoM. MazzucatoM. Mc CubbinR. Mc KayR. Mc NultyG. Mc PhersonC. MeroniW.t. MeyerE. MiglioreL. MirabitoW.a. MitaroffU. MjoernmarkT. MoaM. MochR. MoellerK. MoenigM.r. MongeD. MoraesX. MoreauP. MorettiniG. MortonU. MuellerK. MuenichM. MuldersC. Mulet-marquisR. MuresanW.j. MurrayB. MurynG. MyattT. MyklebustF. NaraghiM. NassiakouF.l. NavarriaS. NavasK. NawrockiP. NegriN. NeufeldR. NicolaidouB.s. NielsenP. NiezurawskiM. NikolenkoV. NomokonovA. NygrenV. ObraztsovA.g. OlshevskiA. OnofreR. OravaG. OraziK. OsterbergA. OuraouM. PaganoniS. PaianoR. PainR. PaivaJ. PalaciosH. PalkaTh.d. PapadopoulouK. PapageorgiouL. PapeC. ParkesF. ParodiU. ParzefallA. PasseriO. PassonT. PavelM. PegoraroL. PeraltaM. PernickaA. PerrottaC. PetridouA. PetroliniH.t. PhillipsF. PierreM. PimentaE. PiottoT. PodobnikM.e. PolG. PolokP. PoropatV. PozdniakovP. PriviteraN. PukhaevaA. PulliaD. RadojicicS. RagazziH. RahmaniJ. RamesP.n. RatoffA.l. ReadP. RebecchiN.g. RedaelliM. ReglerJ. RehnD. ReidR. ReinhardtP.b. RentonL.k. ResvanisF. RichardJ. RidkyG. RinaudoI. Ripp-baudotO. RohneA. RomeroP. RoncheseE.i. RosenbergP. RosinskyP. RoudeauT. RovelliCh. RoyonV. Ruhlmann-kleiderA. RuizH. SaarikkoY. SacquinA. SadovskyG. SajotJ. SaltD. SampsonidisM. SanninoPh. SchwemlingB. SchweringU. SchwickerathF. ScuriP. SeagerY. SedykhA.m. SegarN. SeibertR. SekulinR.c. ShellardM. SiebelL. SimardF. SimonettoA.n. SisakianG. SmadjaO. SmirnovaG.r. SmithA. SokolovO. SolovianovA. SopczakR. SosnowskiT. SpassovE. SpiritiS. SquarciaC. StanescuS. StanicM. StanitzkiK. StevensonA. StocchiJ. StraussR. StrubB. StuguM. SzczekowskiM. SzeptyckaT. TabarelliA. TaffardF. TegenfeldtF. TerranovaJ. ThomasJ. TimmermansN. TintiL.g. TkatchevM. TobinS. TodorovaA. TomaradzeB. TomeA. TonazzoL. TortoraP. TortosaG. TranstromerD. TreilleG. TristramM. TrochimczukC. TronconM-l. TurluerI.a. TyapkinS. TzamariasO. UllalandV. UvarovG. ValentiE. VallazzaC. Vander VeldeP. Van DamW. Van Den BoeckW.k. Van DoninckJ. Van EldikA. Van LysebettenN. Van RemortelI. Van VulpenG. VegniL. VenturaW. VenusF. VerbeureP. VerdierM. VerlatoL.s. VertogradovV. VerziD. VilanovaL. VitaleE. VlasovA.s. VodopyanovG. VoulgarisV. VrbaH. WahlenC. WalckA.j. WashbrookC. WeiserD. WickeJ.h. WickensG.r. WilkinsonM. WinterM. WitekG. WolfJ. YiO. YushchenkoA. ZaitsevA. ZalewskaP. ZalewskiD. ZavrtanikE. ZevgolatakosN.i. ZiminA. ZintchenkoPh. ZollerG.c. ZucchelliG. Zumerle

subject

Nuclear and High Energy PhysicsParticle physicsMesonHadronFOS: Physical sciences01 natural sciencesPartícules (Física nuclear)High Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)0103 physical sciencesNuclear Experiment010306 general physicsDELPHIPhysicsEnergy distribution010308 nuclear & particles physicsBranching fractionHigh Energy Physics::PhenomenologyRest frameLARGE ELECTRON POSITRON COLLIDERPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIPARTICLE PHYSICSFísica nuclearHigh Energy Physics::ExperimentParticle Physics - ExperimentLepton

description

The ratio of the CKM quark-mixing matrix elements |Vub|/|Vcb| has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M_X of the secondary hadronic system produced in association with an identified lepton. Since B -> X_u lepton anti-nu transitions are characterised by hadronic masses below those of the D mesons produced in B -> X_c lepton anti-nu transitions, events with a reconstructed value of M_X significantly below the D mass are selected. Further signal enrichments are obtained using the topology of reconstructed decays and hadron identification. A fit to the numbers of decays in the b -> u enriched and depleted samples with M_X above and below 1.6 GeV/c^2 and to the shapes of the lepton energy distribution in the B rest frame gives |Vub|/|Vcb|= 0.103^{+0.011}_{-0.012} (stat.) +/- 0.016 (syst.) +/- 0.010 (model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B -> X_u lepton anti-nu) = (1.57 +/- 0.35 (stat.) +/- 0.48 (syst.) +/- 0.27 (model)) x 10^{-3}.

https://doi.org/10.1016/s0370-2693(00)00281-1