6533b85cfe1ef96bd12bcaf9

RESEARCH PRODUCT

Limits on the production of scalar leptoquarks from $Z^0$ decays at LEP

P. AbreuW. AdamT. AdyeE. AgasiR. AleksanG. D. AlekseevA. AlgeriP. AllenS. AlmehedS. J. AlvsvaagU. AmaldiA. AndreazzaP. AntilogusW. D. ApelR. J. ApsimonY. ArnoudB. AsmanJ. E. AugustinA. AugustinusP. BaillonP. BambadeF. BaraoR. BarateG. BarbielliniD. Y. BardinG. J. BarkerA. BaroncelliO. BarringJ. A. BarrioW. BartlM. J. BatesM. BattagliaM. BaubillierK. H. BecksM. BegalliP. BeilliereY. BelokopytovP. BeltranD. BenedicA. C. BenvenutiM. BerggrenD. BertrandF. BianchiM. S. BilenkyP. BilloirJ. BjarneD. BlochJ. BlockiS. BlythV. BocciP. N. BogolubovT. BologneseM. BonesiniW. Bonivento P. S. L.G. BorisovH. BornerC. BosioB. BostjancicS. BosworthO. BotnerB. BouquetC. Bourdarios T. J. V.M. BozzoS. BraibantP. BranchiniK. D. BrandR. A. BrennerH. BriandC. BricmanL. Brillault R. C. A.P. BruckmanJ. M. BrunetA. BudziakL. BuggeT. BuranH. Burmeister J. A. M.M. CacciaM. Calvi A. J. C.R. CampionT. CamporesiV. CanaleF. CaoF. CarenaL. Carroll M. V. C.A. CattaiF. R. CavalloL. CerritoV. ChabaudA. ChanM. ChapkinP. CharpentierL. ChaussardJ. ChauveauP. ChecchiaG. A. ChelkovL. ChevalierP. ChliapnikovV. Chorowicz J. T. M.V. CindroP. CollinsJ. L. ContrerasR. ContriE. CortinaG. CosmeF. CouchotH. B. CrawleyD. CrennellG. CrosettiM. CrozonJ. C. MaestroS. CzellarE. DahljensenB. DalmagneM. DamG. DamgaardG. DarboE. DaubieA. DaumP. D. DaunceyM. DavenportJ. DaviesW. DasilvaC. DefoixP. DelpierreN. DemariaA. DeangelisH. DeboeckW. DeboerS. DebrabandereC. Declercq M. D. M.C. DelavaissiereB. DelottoA. DeminH. DijkstraL. DiciaccioJ. DolbeauM. DonszelmannK. DorobaM. DracosJ. DreesM. DrisY. DufourF. DupontD. EdsallL. O. Eek P. A. M.R. EhretT. EkelofG. EkspongA. E. PeisertM. ElsingJ. P. EngelN. ErshaidatD. FassouliotisM. FeindtA. FerrerT. A. FilippasA. FirestoneH. FoethE. FokitisF. Fontanelli K. A. J.J. L. FoussetS. FranconB. FranekP. FrenkielD. C. FriesA. G. FrodesenR. FruhwirthF. FuldaquenzerH. FurstenauJ. FusterD. GambaC. GarciaJ. GarciaC. GasparUgo GaspariniP. GavilletE. N. GazisJ. P. GerberP. GiacomelliD. GillespieR. GokieliB. GolobV. M. Golovatyuk J. J. G.G. GopalL. GornM. GorskiV. GraccoA. GrantF. GrardE. GrazianiG. GrosdidierE. GrossB. GrosseteteJ. GuyU. HaedingerF. HahnM. HahnS. HaiderA. HakanssonA. HallgrenK. HamacherG. H. DemonchenaultW. HaoF. J. HarrisV. HedbergT. HenkesJ. J. HernandezP. HerquetH. HerrT. L. HessingI. HietanenC. O. HigginsE. HigonH. J. HilkeS. D. HodgsonT. HofmoklS. O. HolmgrenP. J. HoltD. HolthuizenP. F. HonoreM. HouldenJ. HrubecK. HuetP. O. HulthK. HultqvistP. IoannouP. S. IversenJ. N. JacksonP. JalochaG. JarlskogP. JarryB. JeanmarieE. K. JohanssonM. JonkerL. JonssonP. JuillotG. KalkanisG. KalmusF. KapustaM. KarlssonE. KarvelasS. KatsanevasE. C. KatsoufisR. KeranenB. A. KhomenkoN. N. KhovanskiB. KingN. J. KjaerH. KleinA. KlovningP. KluitA. KochmehrinJ. H. KoehneB. KoeneP. KokkiniasM. KoratzinosA. V. KorytovV. KostioukhineC. KourkoumelisO. KouznetsovP. H. KramerM. KrammerC. KreuterJ. KrolikowskiI. KronkvistU. KruenermarquisW. KrupinskiK. KulkaK. KurvinenC. LacastaC. LambropoulosJ. W. LamsaL. LanceriV. LapinI. LastJ. P. LaugierR. LauhakangasG. LederF. LedroitR. LeitnerY. LemoigneJ. LemonneG. LenzenV. LepeltierT. LesiakJ. M. LevyE. LiebD. LikoJ. LindgrenR. LindnerI. LippiB. LoerstadM. LokajicekJ. G. LokenA. Lopezfernandez M. A. L.M. LosD. LoukasJ. J. LozanoP. LutzL. LyonsG. MaehlumJ. MaillardA. MaioA. MaltezosF. MandlJ. MarcoMartino MargoniJ. C. MarinA. MarkouT. MaronS. MartiC. MartinezriveroF. MatorrasC. MatteuzziG. MatthiaeM. MazzucatoM. MccubbinR. MckayR. McnultyJ. MedboG. MeolaC. MeroniW. T. MeyerM. MichelottoI. MikulecL. MirabitoW. A. MitaroffG. V. MitselmakherU. MjoernmarkT. MoaR. MoellerK. MoenigM. R. MongeP. MorettiniH. MuellerW. J. MurrayB. MurynG. MyattF. L. NavarriaP. NegriS. NemecekR. NicolaidouB. S. NielsenB. NijjharV. Nikolaenko P. E. S.P. NissA. NomerotskiV. ObraztsovA. G. OlshevskiR. OravaA. OstankovK. OsterbergA. OuraouM. PaganoniR. PainH. PalkaT. D. PapadopoulouL. PapeF. ParodiA. PasseriM. PegoraroJ. PennanenL. PeraltaH. PerneggerM. PernickaA. PerrottaC. PetridouA. PetroliniL. PetrovykhG. PianaF. PierreM. PimentaS. PlaszczynskiO. PodobrinM. E. PolG. PolokP. PoropatV. PozdniakovP. PriviteraA. PulliaD. RadojicicS. RagazziH. RahmaniJ. RamesP. N. RatoffA. L. ReadP. RebecchiN. G. RedaelliM. ReglerD. ReidP. B. RentonL. K. ResvanisF. RichardJ. RichardsonJ. RidkyG. RinaudoI. RoditiA. RomeroI. RoncaglioloPaolo RoncheseC. RonnqvistE. I. RosenbergE. RossoP. RoudeauT. RovelliW. RuckstuhlV. RuhlmannkleiderA. RuizK. RybickiH. SaarikkoY. SacquinG. SajotJ. SaltJ. SanchezM. SanninoS. SchaelH. Schneider M. A. E.G. SciollaF. ScuriA. M. SegarA. SeitzR. SekulinM. SessaR. SeufertR. C. ShellardI. SiccamaP. SiegristS. SimonettiFranco SimonettoA. N. SisakianG. SkjevlingG. SmadjaN. SmirnovO. SmirnovaG. R. SmithR. SosnowskiD. SouzasantosT. S. SpassoffE. SpiritiS. SquarciaH. StaeckC. StanescuS. StapnesG. StavropoulosF. StichelbautA. StocchiJ. StraussJ. StraverR. StrubB. StuguM. SzczekowskiM. SzeptyckaP. SzymanskiT. TabarelliO. TchikilevG. E. TheodosiouA. TilquinJ. TimmermansV. G. TimofeevL. G. TkatchevT. TodorovD. Z. ToetO. TokerA. TomaradzeB. TomeE. TorassaL. TortoraD. TreilleW. TrischukG. TristramC. TronconA. TsirouE. N. TsyganovM. TuralaM. L. TurluerT. TuuvaI. A. TyapkinM. TyndelS. TzamariasS. UeberschaerO. UllalandV. UvarovG. ValentiE. Vallazza J. A. V.C. VanderveldeG. W. VanapeldoornP. VandamM. VanderheijdenW. K. VandoninckJ. VaneldikP. VazG. VegniL. VenturaW. VenusF. VerbeureM. VerlatoL. S. VertogradovD. VilanovaP. VincentL. VitaleE. VlasovA. S. VodopyanovM. VollmerM. VoutilainenV. VrbaH. WahlenC. WalckF. WaldnerA. WehrM. WeierstallP. WeilhammerA. M. WetherellJ. H. WickensG. R. Wilkinson W. S. C.M. WinterM. WitekG. WormserK. WoschnaggN. YamdagniP. YepesA. ZaitsevA. ZalewskaP. ZalewskiD. ZavrtanikE. ZevgolatakosN. I. ZiminM. ZitoD. ZontarR. ZuberiR. Z. FunchalGianni ZumerleJ. Zuniga

subject

Nuclear and High Energy PhysicsParticle physicsLUND MONTE-CARLOElectron–positron annihilationScalar (mathematics)Elementary particle01 natural sciencesJET FRAGMENTATIONNuclear physicsPHYSICSSEARCH0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]PARTICLESLeptoquarkE+E COLLIDERSLimit (mathematics)LUND MONTE-CARLO; JET FRAGMENTATION; E+E COLLIDERS; SEARCH; SIGNATURES; PARTICLES; PHYSICS010306 general physicsSIGNATURESPhysics010308 nuclear & particles physicsBranching fractionHigh Energy Physics::PhenomenologyYukawa potentialPair productionHigh Energy Physics::ExperimentFísica nuclearParticle Physics - Experiment

description

A search has been made for pairs and for single production of scalar leptoquarks of the first and second generations using a data sample of 392000 Z0 decays from the DELPHI detector at LEP 1. No signal was found and limits on the leptoquark mass, production cross section and branching ratio were set. A mass limit at 95% confidence level of 45.5 GeV/c2 was obtained for leptoquark pair production. The search for the production of a single leptoquark probed the mass region above this limit and its results exclude first and second generation leptoquarks D0 with masses below 65 GeV/c2 and 73 GeV/c2 respectively, at 95% confidence level, assuming that the D0lq Yukawa coupling alpha(lambda) is equal to the electromagnetic one. An upper limit is also given on the coupling alpha(lambda) as a function of the leptoquark mass m(D0).

http://hal.in2p3.fr/in2p3-00001218