6533b852fe1ef96bd12aa3b9

RESEARCH PRODUCT

Measurement of the spin density matrix for the rho(0), K*(0)(892) and phi produced in Z(0) decays

H. FoethR. AlemanyT. TabarelliS. AmatoB. UeberschaerP. RebecchiH. RahmaniG. RinaudoG. MyattA. De AngelisE. K. JohanssonSteinar StapnesM. GorskiP. CollinsG. D. AlekseevAriella CattaiF. LedroitO. BarringA. FirestoneDaniel BlochKirsten DreesN. VassilopoulosF. TegenfeldtAndrei NomerotskiP. AbreuAhmimed OuraouNorbert NeumeisterDietrich LikoP. PriviteraImad Baptiste LaktinehD. Y. BardinH. SaarikkoD. J. HolthuizenM. Mc CubbinRobert S. BrownK. HultqvistRafael MarcoW. D. ApelB. FranekL.n. GerdyukovP. SiegristP. KokkiniasA. W. BorglandA. MiagkovJ. BaudotP. DelpierreO. PodobrinM. E. PolD. GambaB. DalmagneB. GolobV. MalychevK. GrzelakF. NaraghiZ. KrumsteinT. BuranMarkus ElsingMatteo PegoraroA. De MinT. BrenkeK. KorcylR. LauhakangasPh. CharpentierA. FerrerJ. SaltP. VincentDaniel TreilleM. BarbiE. FalkPatrick JarryWolfgang AdamD. KnoblauchA. G. FrodesenE. ZevgolatakosKlaus HamacherS. Marti I GarciaD. EdsallK. KarafasoulisJ. MasikR. ChiericiG. WilkinsonJ. RidkyA.n. SisakianL. De PaulaS. TzamariasC. ParkesR. ContriMario SanninoCorinne BeratJ. M. LopezA. RuizYu. BelokopytovG. FanourakisJ. FusterPierre JuillotA. Di DiodatoM. L. TurluerD. ReidM. A E SchynsK. NawrockiP. AntilogusE. BoudinovP. KubinecLydia RoosJosef StraussC. JoramJ. DreesV. ChabaudM. Espirito SantoW. VenusNikita SmirnovG. TranstromerJ. KrsticR. OravaA. PasseriW. KrupinskiD. VilanovaT. J. V. BowcockA. TrombiniT. L. HessingB. De LottoM. PimentaM. V. Castillo GimenezP. PoropatF. Martinez-vidalL. SerbelloniGianni ZumerleH. PalkaF. Fulda-quenzerI. StavitskiC. WeiserV. GraccoD. ZavrtanikA. OnofreA. GalloniS. O. HolmgrenG. EigenG. PianaClara TronconM. BigiEvangelos GazisO. BotnerR. MoellerP. BruckmanA. SeitzM. FeindtF. PierreMogens DamAlexander Lincoln ReadC. PetridouPaolo MorettiniMarc BesanconK. StevensonG. ValentiRupert LeitnerG. MatthiaeM. KaiserP. NegriP. FerrariL. S. VertogradovP. SeagerP. RosinskyS. NavasC. GarciaA. SadovskyL. K. ResvanisLuc PapeAnna LipniackaK. RybickiAndromachi TsirouP. BambadeZ. HajdukP. BuschmannR. Mc KayL. Di CiaccioJosef HrubecA. AndreazzaMassimo CacciaM. GandelmanJ. DolbeauStefano RagazziD. W. LaneJ. G. LokenA. GrefrathP. BeilliereManfred KrammerDenis GeléT. RovelliP. V. ChliapnikovW.s.c. WilliamsVladimir NikolaenkoChiara MariottiE. I. RosenbergL. M. MundimK. KurvinenD. WickeC. Martinez-riveroM. MichelottoO. SmirnovaS. HoorelbekePaolo RoncheseN. J. KjaerT. MyklebustP. HerquetF. BaraoAndre AugustinusJ. P. TavernetA. PerrottaG. BorisovM. BaubillierJ. J. HernandezR. GokieliV. Ruhlmann-kleiderR. JanikP.s.l. BoothC. De La VaissiereFabrizio ParodiK. D. BrandT. BurgsmuellerN. I. ZiminV. HedbergP. GoncalvesP. SponholzCh. JarlskogA. M. SegarM. A. WinterG. CrosettiEvgueni VlasovF. ScuriG. EkspongM. VerlatoC. GreenG. TristramA. StocchiL. TortoraManolis DrisD. BertiniR. JacobssonF. J. HarrisS. TodorovaA. M. ZaitsevAlexander VodopyanovR. KeranenFrancisco MatorrasT. EkelofS. MeyerCharles BricmanM. R. MongeJ. D. DurandC. KreuterV. ChorowiczF. TerranovaJ. H. CowellP. P. AllportK. PapageorgiouA. TonazzoA. BaroncelliUlrich ParzefallJ. Van EldikHeinz PerneggerK. DorobaL. BuggeA. G. OlshevskiL. ChaussardP. Van DamM. BozzoF. FormentiF. CaoV.a. UvarovG. Mc PhersonV. LepeltierA. SheridanM. RealeL. G. TkatchevJ. GarciaG. SciollaW. Da SilvaF. R. CavalloW. KucewiczS. HahnF. CarenaA. TilquinW. A. MitaroffJ. M. HeuserJ. YiJ. W. LamsaA. J. Camacho RozasE. GrazianiY. ArnoudM. BlumeI. A. TyapkinR. HenriquesV. ObraztsovU. SchwickerathL. JonssonP. NissD. Z. ToetB. BouquetJ. M. BrunetA. DeghorainW. NeumannA. MarkouW. De BoerJ. Cuevas MaestroT. TodorovM. DavenportTh. D. PapadopoulouB. MurynP. GrisT. G M MalmgrenH. WahlenG. PolokD. FassouliotisM. PernickaC. CasoA. PetroliniA. Van LysebettenSandor CzellarA. ZalewskaMartijn MuldersM. MazzucatoR. C. ShellardD. BertrandJiri ChudobaE. VallazzaP. ChochulaUgo AmaldiH. MuellerW. T. MeyerD. LoukasF. L. NavarriaO. YushchenkoW. Oberschulte-beckmannJesus MarcoG. LenzenP. ZalewskiM. BegalliV. KostioukhineM. KoratzinosM. NikolenkoS. KatsanevasM. WielersR. SekulinA. M. WetherellI. KronkvistYu. GouzG. SajotMartino MargoniJacques LemonneK. H. BecksM. BattagliaE. FokitisP. JonssonG. GopalC. MatteuzziC. De ClercqR. A. BrennerJ. N. JacksonO. KouznetsovG. CosmeA. C. BenvenutiT. A. FilippasD. StampferP. B. RentonF. CossuttiJ. P. GerberS. SquarciaG. VegniG. BarbielliniM. ReglerW. J. MurrayPawel JalochaBarry KingE. SpiritiT. MoaCristian StanescuP. BranchiniLaurent MirabitoH. SchneiderJuergen ThomasPaul BaillonF. ZachG. JarlskogS. FichetG. OraziJ. C. MarinE. MiglioreH. HerrStanislav NemecekM. SzeptyckaJ. MedboN. PukhaevaM. WitekF. HahnR. FrühwirthJ. TimmermansJ. DahmR. StrubE. C. KatsoufisAmiran TomaradzeY. SacquinRosy NicolaidouYu. SedykhUgo GaspariniA. DjannatiO. UllalandMarta CalviM. A. BizouardKathy HuetValeriy PozdniakovVincenzo CanaleGeoffrey SmithF. RichardM. J. BatesK. MuenichT. PodobnikG. Della RiccaG. W. Van ApeldoornO. SolovianovC. K. LeganM. BonesiniW. BoniventoL. VenturaK. YipJ. GuyLouis LyonsC. GasparToralf Bernhard SkaaliP. AnderssonP. RoudeauA. SokolovMarcos DracosTim AdyeF. VerbeureB. MarechalR. Mc NultyJ. R. MahonB. StuguChristine KourkoumelisJ. P. EngelCarlos LacastaM. TyndelS. StanicA. B. FenyukG. C. ZucchelliA. PulliaG. J. BarkerMingshui ChenG. GrosdidierG. A. ChelkovT. WlodekR. EhretPaul DaunceyN. DemariaP. PaganiniG. DamgaardH. KleinA. HallgrenTiziano CamporesiK. OsterbergP. J. HoltN. G. RedaelliF. BianchiPaolo ChecchiaPh. GavilletL. LanceriC. WalckR. ReinhardtYu.a. KhokhlovS. CabreraJ. MacnaughtonA. NormandM. SzczekowskiM. NieuwenhuizenFlavio FontanelliB. ErzenR. SilvestreM. CanepaU. MjoernmarkPierre BilloirKlaus MoenigM. A. HouldenA. RomeroT. SpassovJ. E. AugustinM. BerggrenE. HigonM. ChapkinVaclav VrbaHans DijkstraH. B. CrawleyC. BosioA. NygrenH. T. PhillipsVladimir CindroS. AlmehedL. PeraltaR. SosnowskiB. LoerstadN. N. KhovanskiR. PainJ. P. LaugierJ. LibbyOle RøhneB. A. KhomenkoP. LangefeldL. GornC. BourdariosA. LeisosG. MaehlumM. GuntherO. KlappBorge Svane NielsenS. De BrabandereChiara MeroniA. MaioPeter KluitM. S. BilenkyL.j. CarrollP. N. RatoffP.a. FischerT. LesiakF. SimonettoF. KapustaG. LederB. ÅSmanV. LefebureD. CrennellF. MandlG. SmadjaE. CortinaB. Jean-marieI. LippiL. VitaleJ. H. WickensMarco PaganoniD. RadojicicD. Souza-santosP. Lutz

subject

Nuclear and High Energy PhysicsMesonElectron–positron annihilationD-STARHadronANNIHILATIONSPartícules (Física nuclear)QUARK FRAGMENTATION; D-STAR; ANNIHILATIONS; HADRONS; MESONSNuclear physicsAngular distribution[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Matrix elementSpin densityDetectors de radiacióDELPHIPhysicsHADRONSD-STARQUARK FRAGMENTATIONLARGE ELECTRON POSITRON COLLIDERMESONSPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIMass spectrumPARTICLE PHYSICSAtomic physicsParticle Physics - Experiment

description

The spin density matrix elements for the rho(0), K-*0(892) and phi produced in hadronic Z(0) decays are measured in the DELPHI detector. There is no evidence for spin alignment of the K-*0(892) and phi, in the region x(p) less than or equal to 0.3 (x(p) = p/p(beam)), where rho(00) = 0.33 +/- 0.05 and rho(00) = 0.30 +/- 0.04, respectively. In the fragmentation region, x(p) greater than or equal to 0.4, there is some indication for spin alignment of the rho(0) and K-*0(892), since rho(00) = 0.43 +/- 0.05 and rho(00) = 0.46 +/- 0.08, respectively. These values are compared with those found in meson-induced hadronic reactions. For the phi, rho(00) = 0.30 +/- 0.04 for x(p) greater than or equal to 0.4 and 0.55 +/- 0.10 for x(p) greater than or equal to 0.7. The off-diagonal spin density matrix element rho(1-1) is consistent with zero in all cases. (C) 1997 Published by Elsevier Science B.V.

10.1016/s0370-2693(97)00758-2http://ora.ox.ac.uk/objects/uuid:a92ba54d-90f0-4e51-b137-cf4392a40fc1