18Muon Pair Production in ep Collisions at HERA

DESY-03-159ISSN0418-9833October2003MuonPairProductioninepCollisionsatHERAH1CollaborationAbstractCrosssectionsfortheproductionoftwoisolatedmuonsuptohighdi-muonmassesaremeasuredinepcollisionsatHERAwiththeH1detectorinadatasamplecorrespondingtoanintegratedluminosityof71pb−1atacentreofmassenergyof√s=319GeV.TheresultsareingoodagreementwithStandardModelpredictions,thedominantprocessbeingphoton-photoninteractions.Additionalmuonsorelectronsaresearchedforineventswithtwohightransversemomentummuonsusingthefulldatasamplecorrespondingto114pb−1,wheredataat√s=301GeVand√s=319GeVarecombined.Boththedi-leptonsampleandthetri-leptonsampleagreewellwiththepredictions.TobesubmittedtoPhys.Lett.BA.Aktas10,V.Andreev24,T.Anthonis4,A.Asmone31,A.Babaev23,S.Backovic35,J.B¨ahr35,P.Baranov24,E.Barrelet28,W.Bartel10,S.Baumgartner36,J.Becker37,M.Beckingham21,O.Behnke13,O.Behrendt7,A.Belousov24,Ch.Berger1,N.Berger36,T.Berndt14,J.C.Bizot26,J.B¨ohme10,M.-O.Boenig7,V.Boudry27,J.Bracinik25,W.Braunschweig1,V.Brisson26,H.-B.Br¨oker2,D.P.Brown10,D.Bruncko16,F.W.B¨usser11,A.Bunyatyan12,34,G.Buschhorn25,L.Bystritskaya23,A.J.Campbell10,S.Caron1,F.Cassol-Brunner22,K.Cerny30,V.Chekelian25,C.Collard4,J.G.Contreras7,41,Y.R.Coppens3,J.A.Coughlan5,M.-C.Cousinou22,B.E.Cox21,G.Cozzika9,J.Cvach29,J.B.Dainton18,W.D.Dau15,K.Daum33,39,B.Delcourt26,N.Delerue22,R.Demirchyan34,A.DeRoeck10,43,K.Desch11,E.A.DeWolf4,C.Diaconu22,J.Dingfelder13,V.Dodonov12,J.D.Dowell3,A.Dubak25,C.Duprel2,G.Eckerlin10,V.Efremenko23,S.Egli32,R.Eichler32,F.Eisele13,M.Ellerbrock13,E.Elsen10,M.Erdmann10,40,e,W.Erdmann36,P.J.W.Faulkner3,L.Favart4,A.Fedotov23,R.Felst10,J.Ferencei10,M.Fleischer10,P.Fleischmann10,Y.H.Fleming3,G.Flucke10,G.Fl¨ugge2,A.Fomenko24,I.Foresti37,J.Form´anek30,G.Franke10,G.Frising1,E.Gabathuler18,K.Gabathuler32,J.Garvey3,J.Gassner32,J.Gayler10,R.Gerhards10,C.Gerlich13,S.Ghazaryan34,L.Goerlich6,N.Gogitidze24,S.Gorbounov35,C.Grab36,V.Grabski34,H.Gr¨assler2,T.Greenshaw18,M.Gregori19,G.Grindhammer25,D.Haidt10,L.Hajduk6,J.Haller13,G.Heinzelmann11,R.C.W.Henderson17,H.Henschel35,O.Henshaw3,R.Heremans4,G.Herrera7,44,I.Herynek29,R.-D.Heuer11,M.Hildebrandt37,K.H.Hiller35,J.Hladk´y29,P.H¨oting2,D.Hoffmann22,R.Horisberger32,A.Hovhannisyan34,M.Ibbotson21,M.Ismail21,M.Jacquet26,L.Janauschek25,X.Janssen10,V.Jemanov11,L.J¨onsson20,C.Johnson3,D.P.Johnson4,H.Jung20,10,D.Kant19,M.Kapichine8,M.Karlsson20,J.Katzy10,N.Keller37,J.Kennedy18,I.R.Kenyon3,C.Kiesling25,M.Klein35,C.Kleinwort10,T.Kluge1,G.Knies10,A.Knutsson20,B.Koblitz25,S.D.Kolya21,V.Korbel10,P.Kostka35,R.Koutouev12,A.Kropivnitskaya23,J.Kroseberg37,J.K¨uckens10,T.Kuhr10,M.P.J.Landon19,W.Lange35,T.Laˇstoviˇcka35,30,P.Laycock18,A.Lebedev24,B.Leißner1,R.Lemrani10,V.Lendermann10,S.Levonian10,B.List36,E.Lobodzinska35,6,N.Loktionova24,R.Lopez-Fernandez10,V.Lubimov23,H.Lueders11,S.L¨uders36,D.L¨uke7,10,T.Lux11,L.Lytkin12,A.Makankine8,N.Malden21,E.Malinovski24,S.Mangano36,P.Marage4,J.Marks13,R.Marshall21,M.Martisikova10,H.-U.Martyn1,J.Martyniak6,S.J.Maxfield18,D.Meer36,A.Mehta18,K.Meier14,A.B.Meyer11,H.Meyer33,J.Meyer10,S.Michine24,S.Mikocki6,I.Milcewicz6,D.Milstead18,F.Moreau27,A.Morozov8,I.Morozov8,J.V.Morris5,M.Mozer13,K.M¨uller37,P.Mur´ın16,42,V.Nagovizin23,B.Naroska11,J.Naumann7,Th.Naumann35,P.R.Newman3,C.Niebuhr10,D.Nikitin8,G.Nowak6,M.Nozicka30,B.Olivier10,J.E.Olsson10,G.Ossoskov8,D.Ozerov23,C.Pascaud26,G.D.Patel18,M.Peez22,E.Perez9,A.Perieanu10,A.Petrukhin35,D.Pitzl10,R.P¨oschl26,B.Portheault26,B.Povh12,N.Raicevic35,J.Rauschenberger11,P.Reimer29,B.Reisert25,C.Risler25,E.Rizvi3,P.Robmann37,R.Roosen4,A.Rostovtsev23,Z.Rurikova25,S.Rusakov24,K.Rybicki6,†,D.P.C.Sankey5,E.Sauvan22,S.Sch¨atzel13,J.Scheins10,F.-P.Schilling10,P.Schleper10,S.Schmidt25,S.Schmitt37,M.Schneider22,L.Schoeffel9,A.Sch¨oning36,V.Schr¨oder10,H.-C.Schultz-Coulon7,C.Schwanenberger10,K.Sedl´ak29,F.Sefkow10,I.Sheviakov24,L.N.Shtarkov24,Y.Sirois27,T.Sloan17,P.Smirnov24,Y.Soloviev24,D.South21,V.Spaskov8,A.Specka27,H.Spitzer11,R.Stamen10,B.Stella31,J.Stiewe14,I.Strauch10,U.Straumann37,G.Thompson19,P.D.Thompson3,F.Tomasz14,D.Traynor19,P.Tru¨ol37,G.Tsipolitis10,38,I.Tsurin35,J.Turnau6,E.Tzamariudaki25,A.Uraev23,M.Urban37,A.Usik24,S.Valk´ar30,A.Valk´arov´a30,C.Vall´ee22,1P.VanMechelen4,A.VargasTrevino7,S.Vassiliev8,Y.Vazdik24,C.Veelken18,A.Vest1,A.Vichnevski8,S.Vinokurova10,V.Volchinski34,K.Wacker7,J.Wagner10,B.Waugh21,G.Weber11,R.Weber36,D.Wegener7,C.Werner13,N.Werner37,M.Wessels1,B.Wessling11,M.Winde35,G.-G.Winter10,Ch.Wissing7,E.-E.Woehrling3,E.W¨unsch10,W.Yan10,J.ˇZ´aˇcek30,J.Z´aleˇs´ak30,Z.Zhang26,A.Zhokin23,H.Zohrabyan34,andF.Zomer261I.PhysikalischesInstitutderRWTH,Aachen,Germanya2III.PhysikalischesInstitutderRWTH,Aachen,Germanya3SchoolofPhysicsandSpaceResearch,UniversityofBirmingham,Birmingham,UKb4Inter-UniversityInstituteforHighEnergiesULB-VUB,Brussels;UniversiteitAntwerpen(UIA),Antwerpen;Belgiumc5RutherfordAppletonLaboratory,Chilton,Didcot,UKb6InstituteforNuclearPhysics,Cracow,Polandd7Institutf¨urPhysik,Universit¨atDortmund,Dortmund,Germanya8JointInstituteforNuclearResear