A direct determination of the gluon density in the proton at low x

S Aïd ,K Daum,H Lohmander,P Van Mechelen,A Valkárová,U Krüger,R Roosen,A Lindner,D Feeken,W.J Haynes,O Hamon,H Hufnagel,J Žáček,H Spitzer,J Garvey,Ph Huet,L Del Buono,E Malinovski,R Felst,S Prell,M Oakden,V Efremenko,M Kuhlen,V Riech,A Rostovtsev,K Rüter,A Wegner,F Linsel,A Lebedev,M Fleischer,A Fedotox,K Wacker,H Grässler,J Heatherington,G Bertrand-Coremans,A Buniatian,E Barrelet,J Turnau,D Wegener,K Stephens,C Vallée,R Grässler,J Kurzhöfer,S Masson,T Krämerkämper,J Spiekermann,R Buchholz,M Winde,M Gebauer,K Müller,C.D Hilton,S Levonian,F Charles,G Cozzika,J Janoth,T Greenshaw,F Eisele,S Mani,J Strachota,B Stella,M Charlet,S Spielman,G Lobo,G Rädel,N Wulff,Y Vazdik,V Schröder,J Haack,C Wittek,M Hapke,R Gerhards,S Eichenberger,W Hildesheim,J Hladký,M Flieser,C Yoyon,A Panitch,J Cvach,M Arpagaus,C Niebuhr,V Lubimox,Y Soloviev,D Ozerov,G Weber,M Ibbotson,M Höppner,P Lanius,B Schwab,S Kermiche,J Stiewe,E Panaro,S Mikocki,P Ribarics,M Nyberg-Werther,F Kole,A Usik,J Bán,J Feltesse,P Truöl,M Wagener,W Struczinski,P Bispham,P Kasselmann,C Jacobsson,J Ferencei,M Rietz,D Mercer,F Sefkow,A Walther,V Korbel,L Goerlich,J Martyniak,L Criegee,G Franke,M Hütte,F Botterweck,K Gabathuler,E Eisenhandler,R Starosta,U Kathage,U Obrock,J Gayler,J.C Bizot,C Leverenz,R Marshall,G Lindström,R Kaschowitz,N Magnussen,S Egli,R Prosi,A Braemer,S Reinshagen,R Eichler,K Rosenbauer,N Sahlmann,P Goritchev,D Goldner,E Evrard,S Schleif,J Riedlberger,A Courau,B Fominykh,D Newton,S Schiek,G Pope,A Semenov,H Ehrlichmann,U Straumann,F Rouse,H Küster,V Brisson,A Pieuchot,M Zimmer,O Dünger,U Stößlein,K Stolze,R Maraček,Ch Niedzballa,I Herynek,G Villet,U Krüner-Marquis,B Naroska,H Krehbiel,P Di Nezza,G Buschhorn,A Glazov,F Moreau,U Siewert,L Hajduk,K Rybicki,P Uelkes,G Siegmon,P Biddulph,Ch Ley,D Lüke,H Henschel,L Büngener,H Genzel,D Zarbock,N Gogitidze,R Nahnhauer,C Keuker,K Flamm,M Forbush,H Itterbeck,I Sheviakov,P Hill,E Mroczko,R Steinberg,H Rick,A De Roeck,W.D Dau,D Düllmann,W Zimmermann,V Solochenko,F Niebergall,J Stier,A Gellrich,V Nagovizin,D Vandenplas,W Braunschweig,J Formánek,B Delcourt,C Kiesling,G Grindhammer,G Heinzelmann,W Bartel,E Peppel,J Duboc,T Mavroidis,S Willard,A Droutskoi,P Kostka,M Steenbock,J Marks,U Bassler,D Neyret,P Verrecchia,R Barschke,V Tchernyshov,F Ferrarotto,W Von Schlippe,G Knies,C Pascaud,F Lamarche,J Tutas,S Dagoret,D Haidt,Y Ban,E Schuhmann,M Korn,Ch Berger,D Kant,P Steffen,J Ebert,E Gabathuler,R Nisius,D Milstead,Shahé S Kazarian ,P Smirnov,M Colombo,G Martin,Ch Thiebaux ,H B Dreis ,K Borras,R D Appuhn ,R Lander,Ch Pichler,F Lehner,M P J Landon ,J D Dowell ,M Zur Nedden,P Robmann,D Schmidt,S D Kolya ,Andreas Bernhard Meyer ,J F Laporte ,L Johnson,A J Campbell ,G Müller,C M Cormack ,J R Smith ,R Ryłko ,T R Ebert ,V L Hudgson ,M Klein,J H Köhne ,G Schmidt,D P C Sankey ,J Katzy,M Barth,E Fretwurst,F.W Büsser,H H Kaufmann ,P Loch,Thomas L C Jansen ,D Cussans ,M J Burton ,E Wünsch,F.w Brasse ,A.B Clegg,C Coutures ,P Reimer,A Jachołkowska ,J A Coughlan ,G D Patel ,A Gruber,A Vartapetian,T P Yiou ,Aurélie Wagener ,G C Lopez ,R Bernet,Chris Meyer ,M A Jabiol ,V Boudry,F Raupach,J M Foster ,R C W Henderson ,H J Behrend ,C Grüber ,M Jaffré ,S Tapprogge,J V Morris ,B Clerbaux,I Gorelov,M W Krasny ,R Beyer,A Schöning,R J Ellison ,D Bruncko,П Мурін ,J Martens,M David,J Meyer,V Blobel,S V Rusakov ,Š Valkár ,H U Martyn ,M Seidel,D.P Johnson,C Grab,P R Newman ,S.K Kotelnikov,Raivo Sell ,G Nowak,Patrick Van Esch ,L.R West,H Jung,M Besançon,G Flügge,G W Noyes ,G Eckerlin,L Jönsson,E Perez,G Sciacca,S J Mcmahon ,I O Skillicorn ,H E Roloff ,H.h Duhm ,S Rieß ,D Clarke,J Lipiński ,V Andreev,H P Beck ,C R Brune ,W Erdmann,L N Shtarkov ,H K Nguyen ,J B Dainton ,G Thompson,J P Phillips ,T Merz,Κ Zuber ,M Erdmann,U Goerlach,K Meier,A Belousov,I R Kenyon ,S Bürke ,T Kurča,M Heß ,G G Winter ,Z Zhang,H P Wellisch ,H Oberlack,J Bürger,G Bernardi,H Kolanoski,F Zomer,J E Olsson ,E Elsen,J M Link ,K H Hiller ,P I P Kalmus ,B List,M Weber,P Marage,H Meyer,D Pitzl,J G Contreras ,L Favart,A Babaev,T Carli,B González-Pineiro ,Matías Rolf Hampel ,J P Sutton ,S J Maxfield ,E Rizvi,V Shekelyan,Bernard Andrieu ,R Martin,C Dollfus,J Bähr,T Naumann ,E A De Wolf ,P Baranov,K Rabbertz,A Zhokin,A Fomenko,R Horisberger,W Lange,J W Lomas ,P Schacht,K C Hoeger ,A.E Wright,D Lacour,M Goldberg,C Kleinwort,Б И Кузник ,A Migliori,Thomas Köhler ,A Mehta,S Robertson ,W Ko,T C Nicholls ,Y Sirois,P Schleper,D Krücker

doi:10.1016/0550-3213(95)00348-v

Abstract

A leading order determination of the gluon density in the proton has been performed in the fractional momentum range 1.9 · 10 −3 < x g/ p < 0.18 by measuring multi-jet events from boson-gluon fusion in deep-inelastic scattering with the H1 detector at the electron-proton collider HERA. This direct determination of the gluon density was performed in a kinematic region previously not accessible. The data show a considerable increase of the gluon density with decreasing fractional momenta of the gluons.

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