Observation of Events at Very High Q^2 in ep Colli

arXiv:hep-ex/9702012v123Feb1997DESY97-24ISSN0418-9833February13th1997ObservationofEventsatVeryHighQ2inepCollisionsatHERAH1CollaborationAbstractMeasurementsofepscatteringwithsquared4–momentumtransferQ2upto35000GeV2arecomparedwiththeexpectationofthestandarddeep-inelasticmodeloflepton–nucleonscattering(DIS).ForQ215000GeV2,Nobs=12neutralcurrentcandidateeventsareobservedwheretheexpectationisNDIS=4.71±0.76events.InthesameQ2range,Nobs=4chargedcurrentcandidatesareobservedwheretheexpectationisNDIS=1.77±0.87events.TheprobabilityP(N≥Nobs)thattheDISmodelsignalNfluctuatestoN≥Nobsinarandomsetofexperimentsis6×10−3forneutralcurrentand0.14forchargedcurrent.ThedifferenceintheobservedandexpectednumberofNeutralCurrenteventsismostlyduetoeventsatlargemassesM=√xsinwhichthepositronisbackscatteredatlargey=Q2/M2.SubmittedtoZeitschriftf¨urPhysikCC.Adloff35,S.Aid13,M.Anderson23,V.Andreev26,B.Andrieu29,V.Arkadov36,C.Arndt11,I.Ayyaz30,A.Babaev25,J.B¨ahr36,J.B´an18,Y.Ban28,P.Baranov26,E.Barrelet30,R.Barschke11,W.Bartel11,U.Bassler30,H.P.Beck38,M.Beck14,H.-J.Behrend11,A.Belousov26,Ch.Berger1,G.Bernardi30,G.Bertrand-Coremans4,R.Beyer11,P.Biddulph23,P.Bispham23,J.C.Bizot28,K.Borras8,F.Botterweck27,V.Boudry29,S.Bourov11,A.Braemer15,W.Braunschweig1,V.Brisson28,W.Br¨uckner14,P.Bruel29,D.Bruncko18,C.Brune16,R.Buchholz11,L.B¨ungener13,J.B¨urger11,F.W.B¨usser13,A.Buniatian4,S.Burke19,G.Buschhorn27,D.Calvet24,A.J.Campbell11,T.Carli27,M.Charlet11,D.Clarke5,B.Clerbaux4,S.Cocks20,J.G.Contreras8,C.Cormack20,J.A.Coughlan5,A.Courau28,M.-C.Cousinou24,B.D.Cox23,G.Cozzika9,L.Criegee11,D.G.Cussans5,J.Cvach31,S.Dagoret30,J.B.Dainton20,W.D.Dau17,K.Daum40,M.David9,C.L.Davis19,41,A.DeRoeck11,E.A.DeWolf4,B.Delcourt28,M.Dirkmann8,P.Dixon19,W.Dlugosz7,C.Dollfus38,K.T.Donovan21,J.D.Dowell3,H.B.Dreis2,A.Droutskoi25,O.D¨unger13,J.Ebert35,T.R.Ebert20,G.Eckerlin11,V.Efremenko25,S.Egli38,R.Eichler37,F.Eisele15,E.Eisenhandler21,E.Elsen11,M.Erdmann15,A.B.Fahr13,L.Favart28,A.Fedotov25,R.Felst11,J.Feltesse9,J.Ferencei18,F.Ferrarotto33,K.Flamm11,M.Fleischer8,M.Flieser27,G.Fl¨ugge2,A.Fomenko26,J.Form´anek32,J.M.Foster23,G.Franke11,E.Fretwurst12,E.Gabathuler20,K.Gabathuler34,F.Gaede27,J.Garvey3,J.Gayler11,M.Gebauer36,H.Genzel1,R.Gerhards11,A.Glazov36,L.Goerlich6,N.Gogitidze26,M.Goldberg30,D.Goldner8,K.Golec-Biernat6,B.Gonzalez-Pineiro30,I.Gorelov25,C.Grab37,H.Gr¨assler2,T.Greenshaw20,R.K.Griffiths21,G.Grindhammer27,A.Gruber27,C.Gruber17,T.Hadig1,D.Haidt11,L.Hajduk6,T.Haller14,M.Hampel1,W.J.Haynes5,B.Heinemann11,G.Heinzelmann13,R.C.W.Henderson19,H.Henschel36,I.Herynek31,M.F.Hess27,K.Hewitt3,K.H.Hiller36,C.D.Hilton23,J.Hladk´y31,M.H¨oppner8,D.Hoffmann11,T.Holtom20,R.Horisberger34,V.L.Hudgson3,M.H¨utte8,M.Ibbotson23,C.Issever8,H.Itterbeck1,A.Jacholkowska28,C.Jacobsson22,M.Jacquet28,M.Jaffre28,J.Janoth16,D.M.Jansen14,T.Jansen11,L.J¨onsson22,D.P.Johnson4,H.Jung22,P.I.P.Kalmus21,M.Kander11,D.Kant21,R.Kaschowitz2,U.Kathage17,J.Katzy15,H.H.Kaufmann36,O.Kaufmann15,M.Kausch11,S.Kazarian11,I.R.Kenyon3,S.Kermiche24,C.Keuker1,C.Kiesling27,M.Klein36,C.Kleinwort11,G.Knies11,T.K¨ohler1,J.H.K¨ohne27,H.Kolanoski39,S.D.Kolya23,V.Korbel11,P.Kostka36,S.K.Kotelnikov26,T.Kr¨amerk¨amper8,M.W.Krasny6,30,H.Krehbiel11,D.Kr¨ucker27,A.K¨upper35,H.K¨uster22,M.Kuhlen27,T.Kurˇca36,J.Kurzh¨ofer8,B.Laforge9,M.P.J.Landon21,W.Lange36,U.Langenegger37,A.Lebedev26,F.Lehner11,V.Lemaitre11,S.Levonian29,G.Lindstr¨om12,M.Lindstroem22,F.Linsel11,J.Lipinski11,B.List11,G.Lobo28,G.C.Lopez12,V.Lubimov25,D.L¨uke8,11,L.Lytkin14,N.Magnussen35,H.Mahlke-Kr¨uger11,E.Malinovski26,R.Maraˇcek18,P.Marage4,J.Marks15,R.Marshall23,J.Martens35,G.Martin13,R.Martin20,H.-U.Martyn1,J.Martyniak6,T.Mavroidis21,S.J.Maxfield20,S.J.McMahon20,A.Mehta5,K.Meier16,P.Merkel11,F.Metlica14,A.Meyer11,A.Meyer13,H.Meyer35,J.Meyer11,P.-O.Meyer2,A.Migliori29,S.Mikocki6,D.Milstead20,J.Moeck27,F.Moreau29,J.V.Morris5,E.Mroczko6,D.M¨uller38,K.M¨uller11,P.Mur´ın18,V.Nagovizin25,R.Nahnhauer36,B.Naroska13,Th.Naumann36,I.N´egri24,P.R.Newman3,D.Newton19,H.K.Nguyen30,T.C.Nicholls3,F.Niebergall13,1C.Niebuhr11,Ch.Niedzballa1,H.Niggli37,G.Nowak6,T.Nunnemann14,M.Nyberg-Werther22,H.Oberlack27,J.E.Olsson11,D.Ozerov25,P.Palmen2,E.Panaro11,A.Panitch4,C.Pascaud28,S.Passaggio37,G.D.Patel20,H.Pawletta2,E.Peppel36,E.Perez9,J.P.Phillips20,A.Pieuchot24,D.Pitzl37,R.P¨oschl8,G.Pope7,B.Povh14,S.Prell11,K.Rabbertz1,P.Reimer31,H.Rick8,S.Riess13,E.Rizvi21,P.Robmann38,R.Roosen4,K.Rosenbauer1,A.Rostovtsev30,F.Rouse7,C.Royon9,K.R¨uter27,S.Rusakov26,K.Rybicki6,D.P.C.Sankey5,P.Schacht27,S.Schiek13,S.Schleif16,P.Schleper15,W.vonSchlippe21,D.Schmidt35,G.Schmidt13,L.Schoeffel9,A.Sch¨oning11,V.Schr¨oder11,E.Schuhmann27,B.Schwab15,F.Sefkow38,A.Semenov25,V.Shekelyan11,I.Sheviakov26,L.N.Shtarkov26,G.Siegmon17,U.Siewert17,Y.Sirois29,I.O.Skillicorn10,T.Sloan19,P.Smirnov26,M.Smith20,V.Solochenko25,Y.Soloviev26,A.Specka29,J.Spiekermann8,S.Spielman29,H.Spitzer13,F.Squinabol28,P.Steffen11,R.Steinberg2,J.Steinhart13,B.Stella33,A.Stellberger16,J.Stier11,J.Stiewe16,U.St¨oßlein36,K.Stolze36,U.Straumann15,W.St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