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. 2008 May 23;100(20):201801.
doi: 10.1103/PhysRevLett.100.201801. Epub 2008 May 22.

Strong evidence for ZZ production in pp[over] collisions at sqrt[s]=1.96 TeV

T Aaltonen  1 J AdelmanT AkimotoM G AlbrowB Alvarez GonzálezS AmerioD AmideiA AnastassovA AnnoviJ AntosM AokiG ApollinariA ApresyanT ArisawaA ArtikovW AshmanskasA AttalA AurisanoF AzfarP Azzi-BacchettaP AzzurriN BacchettaW BadgettA Barbaro-GaltieriV E BarnesB A BarnettS BaroiantV BartschG BauerP-H BeaucheminF BedeschiP BednarS BehariG BellettiniJ BellingerA BelloniD BenjaminA BeretvasJ BeringerT BerryA BhattiM BinkleyD BiselloI BizjakR E BlairC BlockerB BlumenfeldA BocciA BodekV BoisvertG BollaA BolshovD BortolettoJ BoudreauA BoveiaB BrauA BridgemanL BrigliadoriC BrombergE BrubakerJ BudagovH S BuddS BuddK BurkettG BusettoP BusseyA BuzatuK L ByrumS CabreraM CampanelliM CampbellF CanelliA CanepaD CarlsmithR CarosiS CarrilloS CarronB CasalM CasarsaA CastroP CatastiniD CauzM Cavalli-SforzaA CerriL CerritoS H ChangY C ChenM ChertokG ChiarelliG ChlachidzeF ChlebanaK ChoD ChokheliJ P ChouG ChoudalakisS H ChuangK ChungW H ChungY S ChungC I CiobanuM A CiocciA ClarkD ClarkG CompostellaM E ConveryJ ConwayB CooperK CopicM CordelliG CortianaF CrescioliC Cuenca AlmenarJ CuevasR CulbertsonJ C CullyD DagenhartM DattaT DaviesP de BarbaroS De CeccoA DeisherG De LentdeckerG De LorenzoM Dell'OrsoL DemortierJ DengM DeninnoD De PedisP F DerwentG P Di GiovanniC DionisiB Di RuzzaJ R DittmannM D'OnofrioS DonatiP DongJ DoniniT DorigoS DubeJ EfronR ErbacherD ErredeS ErredeR EusebiH C FangS FarringtonW T FedorkoR G FeildM FeindtJ P FernandezC FerrazzaR FieldG FlanaganR ForrestS ForresterM FranklinJ C FreemanI FuricM GallinaroJ GalyardtF GarbersonJ E GarciaA F GarfinkelK GenserH GerberichD GerdesS GiaguV GiakoumopolouP GiannettiK GibsonJ L GimmellC M GinsburgN GiokarisM GiordaniP GirominiM GiuntaV GlagolevD GlenzinskiM GoldN GoldschmidtA GolossanovG GomezG Gomez-CeballosM GoncharovO GonzálezI GorelovA T GoshawK GoulianosA GreseleS GrinsteinC Grosso-PilcherU GrundlerJ Guimaraes da CostaZ Gunay-UnalanC HaberK HahnS R HahnE HalkiadakisA HamiltonB-Y HanJ Y HanR HandlerF HappacherK HaraD HareM HareS HarperR F HarrR M HarrisM HartzK HatakeyamaJ HauserC HaysM HeckA HeijboerB HeinemannJ HeinrichC HendersonM HerndonJ HeuserS HewamanageD HidasC S HillD HirschbuehlA HockerS HouM HouldenS-C HsuB T HuffmanR E HughesU HusemannJ HustonJ IncandelaG IntrozziM IoriA IvanovB IyutinE JamesB JayatilakaD JeansE J JeonS JindarianiW JohnsonM JonesK K JooS Y JunJ E JungT R JunkT KamonD KarP E KarchinY KatoR KephartU KerzelV KhotilovichB KilminsterD H KimH S KimJ E KimM J KimS B KimS H KimY K KimN KimuraL KirschS KlimenkoM KluteB KnutesonB R KoS A KoayK KondoD J KongJ KonigsbergA KorytovA V KotwalJ KrausM KrepsJ KrollN KrumnackM KruseV KrutelyovT KuboS E KuhlmannT KuhrN P KulkarniY KusakabeS KwangA T LaasanenS LaiS LamiS LammelM LancasterR L LanderK LannonA LathG LatinoI LazzizzeraT LeCompteJ LeeJ LeeY J LeeS W LeeR LefèvreN LeonardoS LeoneS LevyJ D LewisC LinC S LinJ LinacreM LindgrenE LipelesA ListerD O LitvintsevT LiuN S LockyerA LoginovM LoretiL LovasR-S LuD LucchesiJ LueckC LuciP LujanP 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TollefsonT TomuraD TonelliS TorreD TorrettaS TourneurW TrischukY TuN TuriniF UkegawaS UozumiS VallecorsaN van RemortelA VarganovE VatagaF VázquezG VelevC VellidisV VeszpremiM VidalR VidalI VilaR VilarT VineM VogelI VolobouevG VolpiF WürthweinP WagnerR G WagnerR L WagnerJ Wagner-KuhrW WagnerT WakisakaR WallnyS M WangA WarburtonD WatersM WeinbergerW C Wester 3rdB WhitehouseD WhitesonA B WicklundE WicklundG WilliamsH H WilliamsP WilsonB L WinerP WittichS WolbersC WolfeT WrightX WuS M WynneA YagilK YamamotoJ YamaokaT YamashitaC YangU K YangY C YangW M YaoG P YehJ YohK YoritaT YoshidaG B YuI YuS S YuJ C YunL ZanelloA ZanettiI ZawX ZhangY ZhengS ZucchelliCDF CollaborationR C Group
Affiliations

Strong evidence for ZZ production in pp[over] collisions at sqrt[s]=1.96 TeV

T Aaltonen et al. Phys Rev Lett. .

Abstract

We report the first evidence of Z boson pair production at a hadron collider with a significance exceeding 4 standard deviations. This result is based on a data sample corresponding to 1.9 fb(-1) of integrated luminosity from pp[over] collisions at sqrt[s]=1.96 TeV collected with the Collider Detector at Fermilab II detector. In the lll'l' channel, we observe three ZZ candidates with an expected background of 0.096(-0.063)+0.092 events. In the llnunu channel, we use a leading-order calculation of the relative ZZ and WW event probabilities to discriminate between signal and background. In the combination of lll'l' and llnunu channels, we observe an excess of events with a probability of 5.1 x 10(-6) to be due to the expected background. This corresponds to a significance of 4.4 standard deviations. The measured cross section is sigma(pp[over]-->ZZ)=1.4(-0.6)+0.7(stat+syst) pb, consistent with the standard model expectation.

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