Measurement of event shape variables in deep inelastic e p scattering

C Adloff ,Z Zhang,H Henschel ,G Cozzika ,P Reimer ,I Sheviakov ,M Anderson ,A Semenov ,R Barschke ,J V Morris ,M Flieser ,G Pope ,N Gogitidze ,V Solochenko ,R Roosen ,D Schmidt ,K.t Donovan ,A Küpper ,D Vandenplas ,S Aïd ,F Gaede ,C Arndt ,D Krücker ,K Wacker ,P Biddulph ,P Uelkes ,G Flügge ,D Lüke ,J Formánek ,R.k Griffiths ,K Meier ,T Hadig ,G Eckerlin ,J Martens ,O Kaufmann ,M N K Smith ,Aurélie Wagener ,M Kander ,B Schwab ,T Carli ,A Lebedev ,T C Nicholls ,A Droutskoi ,M Jacquet ,E Gabathuler ,E Schuhmann ,V Efremenko ,D Müller ,I Herynek ,P R Newman ,G C Lopez ,F Zomer ,K Rybicki ,I Ayyaz ,M Wagener ,Bogdan Povh ,H Itterbeck ,A Specka ,B List ,H Kolanoski ,S.k Kotelnikov ,E Panaro ,E Mroczko ,S V Rusakov ,H Jung ,D Kant ,D Hoffmann ,J Meyer ,J Feltesse ,C Royon ,R Maraček ,P Truöl ,P Marage ,A Braemer ,A Mehta ,J Lipiński ,H J Behrend ,A Panitch ,D Bruncko ,F Eisele ,M Hütte ,D Brown ,E Perez ,K Rabbertz ,J Steinhart ,J Zsembery ,C M Cormack ,M Kausch ,L Jönsson ,G Lobo ,Š Valkár ,P Kostka ,R Felst ,R Martin ,K Rosenbauer ,W Struczinski ,J Gayler ,C Dollfus ,S Cocks ,J Marks ,S Willard ,T Haller ,B Heinemann ,B Delcourt ,T Nunnemann ,G Thompson ,K Hewitt ,J Martyniak ,L Schoeffel ,J B Dainton ,J Janoth ,V A Andreev ,L Lytkin ,V L Hudgson ,G G Winter ,R Eichler ,H H Kaufmann ,T Wilksen ,I R Kenyon ,A.b Fahr ,W Von Schlippe ,S Bürke ,M Werner ,Ch Berger ,W Długosz ,I Gorelov ,P Zini ,S Mikocki ,V Brisson ,G Weber ,B M Waugh ,J P Sutton ,Y Soloviev ,K Müller ,B Stella ,D Wegener ,P Schacht ,E Peppel ,S Wiesand ,H P Beck ,C Pascaud ,A Fomenko ,L Goerlich ,A Usik ,A Stellberger ,B Laforge ,C Kiesling ,A J Campbell ,G Knies ,P Merkel ,G Bertrand-Coremans ,H Wollatz ,J Bán ,P Verrecchia ,J Hladký ,S Hengstmann ,H Mahlke-Krüger ,L N Shtarkov ,H B Dreis ,H Oberlack ,A Belousov ,T Walter ,D.p Johnson ,E Rizvi ,H Rick ,G Heinzelmann ,Ch Niedzballa ,A Zhokin ,R Todenhagen ,G Villet ,C Grab ,F Moreau ,J Katzy ,M Fleischer ,Andreas Bernhard Meyer ,C Grüber ,D Haidt ,G Schmidt ,H Grässler ,P Palmen ,R Steinberg ,K Stolze ,K Flamm ,P Dixon ,B Naroska ,T Wengler ,П Мурін ,S Tchetchelnitski ,R Beyer ,Y Sirois ,U Siewert ,Ç İşsever ,R C W Henderson ,H Niggli ,A Buniatian ,J Stiewe ,U Bassler ,W.d Dau ,G Siegmon ,W.j Haynes ,S D Kolya ,M David ,U Stößlein ,S Bourov ,J A Coughlan ,T Kurča ,H Küster ,F Sefkow ,P I P Kalmus ,J Spiekermann ,K Rüter ,V Lemaı̂tre ,G Bernardi ,D P C Sankey ,S Kermiche ,W Bartel ,F Botterweck ,D Ozerov ,E Elsen ,Danielle Clarke ,K Gabathuler ,P Van Mechelen ,M C Cousinou ,F Niebergall ,M Dirkmann ,D Milstead ,C R Brune ,H K Nguyen ,A De Roeck ,P Bruel ,B González-Pineiro ,A Valkárová ,M Klein ,Y Vazdik ,G Grindhammer ,V Arkadov ,M Kuhlen ,P Robmann ,R Nahnhauer ,A Babaev ,R Marshall ,E A De Wolf ,T Holtom ,Thomas Köhler ,A Wegner ,G D Patel ,J G Contreras ,M Taševský ,I O Skillicorn ,J Ferencei ,S Levonian ,M Winde ,M Erdmann ,L Hajduk ,T Naumann ,G Nowak ,J Turnau ,P Steffen ,V Schröder ,M Lindstroem ,M Beck ,J H Köhne ,P Baranov ,S Schiek ,F Metlica ,S J Mcmahon ,P.-O Meyer ,D Pitzl ,V Nagovizin ,Patrick Van Esch ,M Wobisch ,A Pieuchot ,R Wallny ,U Langenegger ,M Gebauer ,F Rouse ,J D Dowell ,F Lehner ,H U Martyn ,T Mavroidis ,M Heß ,M Weber ,M W Krasny ,N Tobien ,L Favart ,A Fedotov ,F Ferrarotto ,S Spielman ,H Meyer ,A Rostovtsev ,V Boudry ,J Garvey ,T Sloan ,C Kleinwort ,C Niebuhr ,S J Maxfield ,L.r West ,M P J Landon ,Claude Vallée ,A Migliori ,F Linsel ,J Ebert ,V Korbel ,J M Foster ,P Smirnov ,G Tsipolitis ,B Cox ,G Martin ,S Dagoret ,C.d Hilton ,J Bürger ,S Schleif ,T R Ebert ,F.w Büsser ,R Horisberger ,W Braunschweig ,K Daum ,C Keuker ,J P Phillips ,B Clerbaux ,W Brückner ,C Wittek ,H Krehbiel ,V Shekelyan ,V Tchernyshov ,J Cvach ,A Glazov ,S Egli ,E Eisenhandler ,G Buschhorn ,D M Jansen ,P Schleper ,J E Olsson ,K Borras ,R Gerhards ,D Calvet ,U Kathage ,D Newton ,U Straumann ,T Krämerkämper ,A Schöning ,H Pawletta ,Matías Rolf Hampel ,S Tapprogge ,J Theissen ,H Spitzer ,S Rieß ,S Passaggio ,M Goldberg ,A Gruber ,Shahé S Kazarian ,E Wünsch ,D Cussans ,R Pöschl ,J Moeck ,N Magnussen ,J.c Bizot ,E Tzamariudaki ,J Bähr ,M Jaffré ,P D Thompson ,W Lange ,J Žáček ,E Barrelet ,M Höppner ,V Lubimov ,M Ibbotson ,E Malinovski ,G Franke ,F Squinabol ,I Négri ,D Zarbock ,K H Hiller ,T Greenshaw ,M Charlet ,Bernard Andrieu ,M Zurnedden

doi:10.1016/s0370-2693(97)00754-5

Abstract

Deep inelastic e p scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening and jet mass in the current hemisphere of the Breit frame over a large range of momentum transfers Q between 7 GeV and 100 GeV. The data are compared with results from e + e − experiments. Using second order QCD calculations and an approach to relate hadronisation effects to power corrections an analysis of the Q dependences of the means of the event shape parameters is presented, from which both the power corrections and the strong coupling constant are determined without any assumption on fragmentation models. The power corrections of all event shape variables investigated follow a 1/ Q behaviour and can be described by a common parameter α 0 .

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