Transverse energy and forward jet production in the low x regime at HERA

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

doi:10.1016/0370-2693(95)00804-t

Abstract

The production of transverse energy in deep inelastic scattering is measured as a function of the kinematic variables x and Q 2 using the H1 detector at the ep collider HERA. The results are compared to the different predictions based upon two alternative QCD evolution equations, namely the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and the Balitsky-Fadin-Kuraev-Lipatov (BFKL) equations. In a pseudorapidity interval which is central in the hadronic centre of mass system between the current and the proton remnant fragmentation region the produced transverse energy increases with decreasing x for constant Q 2. Such a behaviour can be explained with a QCD calculation based upon the BFKL ansatz. The rate of forward jets, proposed as a signature for BFKL dynamics, has been measured.

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