A Study of the Fragmentation of Quarksin e � p Collisions at HERAH 1 Collaboration Valeri P. Andreev , Bastien Andrieu , R. D. Appuhn , Martine Arpagaus , Anton Babaev , J. Baehr , Yong Ban , Pavel P. Baranov , Etienne Barrelet , R. Barschke , Wayne L. Bartel , Marie Barth , Ursula Bassler , Hans Peter Beck , H. -J. Behrend , Andrei Belousov , Ch. Berger , Gregorio Bernardi , Roland Bernet , G. Bertrand-Coremans , Mousumi Besan , R. Beyer , Phillip Biddulph , P. Bispham , Jean C. Bizot , Volker Blobel , Kerstin Borras , F. Botterweck , Vincent Boudry , A. Braemer , F. Brasse , Wolfgang Braunschweig , Violette Brisson , Dusan Bruncko , C. Brune , Rainer Buchholz , A. Yu. Buniatian , Stephen Burke , M. J. Burton , Gerd W. Buschhorn , A. J. Campbell , Tancredi Carli , F. Charles , M. Charlet , D. P. Clarke , Andrew B. Clegg , Barbara Clerbaux , Marco Colombo , Jesús Contreras , Carrie L Cormack , J. A. Coughlan , A. Courau , Ch. Coutures , G. Cozzika , L. Criegee , David Cussans , Jaroslav Cvach , Sylvie Dagoret , J. B. Dainton , W. D. Dau , Karin Daum , M. David , Bruno Delcourt , Luigi Del Buono , Albert De Roeck , Eddi A. De Wolf , Pasquale Di Nezza , Charles Dollfus , John D Dowell , H. B. Dreis , A. Droutskoi , Jean-François Duboc , H. H. Duhm , Jens Ebert , Tatjana Ebert , Guenter Eckerlin , V. Efremenko , Stephan Egli , Heiko Ehrlichmann , Stefan Eichenberger , Robert Eichler , Fred Louis Eisele , Eric Eisenhandler , R. J. Ellison , Eckhard Elsen , Martin Erdmann , Wolfram Erdmann , Étienne Évrard , Laurent Favart , Alexander Fedotov , D. Feeken , R. Felst , Joël Feltesse , Jozef Ferencei , F. Ferrarotto , Kenneth Flamm , Monika Fleischer , Michael Dr Flieser , Gustaf Ugge , Andrii Fomenko , B. A. Fominykh , Margaret H. Forbush , J. M. Foster , Gert Franke , Eckhart Fretwurst , Erwin Gabathuler , Kurt Gabathuler , K. Gamerdinger , J. Garvey , J. L. Gayler , Matthias Gebauer , Andreas Gellrich , Herbert Genzel , Roland Gerhards , Ulrich Goerlach , Lars Goerlich , Nelly Gogitidze , M. Goldberg , D. Goldner , B. González-Pineiro , I. V. Gorelov , P. A. Goritchev , Christoph Grab , Tim Greenshaw , G. Grindhammer , A. Gruber , Christoph Gruber , Johannes Haack , Dieter Haidt , Lubos Hajduk , Olivier Hamon , M UniversityF. Hampel , Erin M. Hanlon , Maciej Hapke , W. John Haynes , J. Heatherington , G. Heinzelmann , R. C. W. Henderson , Hans Henschel , I. Herynek , M. F. Hess , W. Hildesheim , Peggy Hill , K. H. Hiller , Connor D. Hilton , J. Hladk , K. C. Hoeger , Roland Horisberger , V. L. Hudgson , Ph. Huet , Heinz Hufnagel , M. Ibbotson , H. Itterbeck , M.-A. Jabiol , A. Jacholkowska , Carl Magnus Gosta Jacobsson , Jürgen Janoth , T. E. Jansen , D. P. Johnson , L. Oberthur Johnson , Hannes Jung , P. I. P. Kalmus , David Kant , R. Kaschowitz , P. Kasselmann , U. Kathage , Jonathan Katzy , H. H. Kaufmann , Sergei Kazarian , I. R. Kenyon , S. Kermiche , Claus Keuker , Ch. Kiesling , Michel H. Klein , Claus Kleinwort , G. Knies , Winston Ko , Hermann Kolanoski , F. Kole , Scott Kolya , Václav Korbel , M. Korn , Pal Kostka , Sergey Kotelnikov , Mieczyslaw Witold Krasny , Helen Jane Krehbiel , J. P. Kubenka , Michael Kuhlen , Julia Ofer , Bożena Kużnik , Didier Lacour , François Lamarche , Richard Lander , Murrough Landon , Wolfgang Lange , P. Lanius , J. F. Laporte , A. Lebedev , Carrie S. Leverenz , Sergey Levonian , Ch. Ley , Alexander M. Lindner , Jonathan Link , F. Linsel , Józef Lipiński , Beatrice List , Georges Lobo , Peter Loch , H. Lohmander , J. W. Lomas , Gabriela Carina López , V. N. Lubimov , Norbert Magnussen , E. I. Malinovski , S. Mani , Pierre Marage , Joerg Marks , Robin Marshall , J. Martens , Roland Martin , H. -U. Martyn , J. Martyniak , S. Masson , T. Mavroidis , S. J. Max eld , S. Mcmahon , Ankita Mehta , Karlheinz Meier , D. Mercer , Tobias Merz , Christopher Meyer , H. J. Meyer , J. Meyer , Albert Migliori , Stanislav Mikocki , D. A. Milstead , François Moreau , J. V. Morris , E. Mroczko , V. Nagovizin , Rolf Nahnhauer , Beate Naroska , Thomas Naumann , P. R. Newman , D. Newton , Damien Neyret , H. K. Nguyen , T. C. Nicholls , F. Niebergall , Carsten Niebuhr , Ch. Niedzballa , Richard Nisius , Grzegorz Nowak , G. W. Noyes , M. Nyberg-Werther , M. Oakden , Horst Oberlack , U. Obrock , J. E. Olsson , Dmitri Ozerov , E. Panaro , Alyssa Panitch , Christian Pascaud , Girish Patel , E. Peppel , E. Nofuentes Pérez , J. P. Phillips , Ch. Pichler , A. Pieuchot , Daniel Pitzl , G. Pope , Soeren Prell , Rainer Prosi , Klaus Rabbertz , P. E. Reimer , St. Reinshagen , P. Ribarics , Hartmut Rick , Volkher Riech , J. Riedlberger , S. Riess , Michael Rietz semanticscholar（2007）
摘要
Deep inelastic scattering (DIS) events, selected from 1993 data taken by the H1 experiment at HERA, are studied in the Breit frame of reference. The fragmentation function of the quark is compared with those of e + e ? data. It is shown that certain aspects of the quarks emerging from within the proton in e ? p interactions are essentially the same as those of quarks pair-created from the vacuum in e + e ? annihilation. The measured area, peak position and width of the fragmentation function show that the kinematic evolution variable, equivalent to the e + e ? squared centre of mass energy, is in the Breit frame the invariant square of the four-momentum transfer. We comment on the extent to which we have evidence for coherence eeects in parton showers.
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