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Elastic Electroproduction of $\rho$ Mesons at HERA

C. Adloff V. Andreev B. Andrieu 1 V. Arkadov A. Astvatsatourov I. Ayyaz 2 A. Babaev J. Bahr P. Baranov E. Barrelet 2 W. Bartel U. Bassler 2 P. Bate A. Beglarian O. Behnke H.J. Behrend C. Beier A. Belousov C. Berger G. Bernardi 2 T. Berndt G. Bertrand-Coremans P. Biddulph J.C. Bizot 3 V. Boudry 1 W. Braunschweig V. Brisson 3 D.P. Brown W. Bruckner Pascal Bruel 1 D. Bruncko J. Burger F.W. Busser A. Buniatian S. Burke A. Burrage G. Buschhorn D. Calvet 4 A.J. Campbell T. Carli E. Chabert 4 M. Charlet D. Clarke B. Clerbaux J.G. Contreras C. Cormack J.A. Coughlan M.C. Cousinou 4 B.E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum M. David M. Davidsson A. de Roeck E.A. de Wolf B. Delcourt 3 R. Demirchyan C. Diaconu M. Dirkmann P. Dixon W. Dlugosz K.T. Donovan J.D. Dowell A. Droutskoi J. Ebert G. Eckerlin D. Eckstein V. Efremenko S. Egli R. Eichler F. Eisele E. Eisenhandler E. Elsen M. Enzenberger M. Erdmann A.B. Fahr P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Feltesse J. Ferencei F. Ferrarotto M. Fleischer G. Flugge A. Fomenko J. Formanek J.M. Foster G. Franke E. Gabathuler K. Gabathuler F. Gaede J. Garvey J. Gassner J. Gayler R. Gerhards S. Ghazaryan A. Glazov L. Goerlich N. Gogitidze M. Goldberg 2 I. Gorelov C. Grab H. Grassler T. Greenshaw R.K. Griffiths G. Grindhammer T. Hadig D. Haidt L. Hajduk M. Hampel V. Haustein W.J. Haynes B. Heinemann G. Heinzelmann R.C.W. Henderson S. Hengstmann H. Henschel R. Heremans I. Herynek K. Hewitt K.H. Hiller C.D. Hilton J. Hladky D. Hoffmann R. Horisberger S. Hurling M. Ibbotson C. Issever M. Jacquet 3 M. Jaffre L. Janauschek D.M. Jansen L. Jonsson D.P. Johnson M. Jones H. Jung H.K. Kastli M. Kander D. Kant M. Kapichine M. Karlsson O. Karschnik J. Katzy O. Kaufmann M. Kausch N. Keller I.R. Kenyon S. Kermiche 4 C. Keuker C. Kiesling M. Klein C. Kleinwort G. Knies J.H. Kohne H. Kolanoski S.D. Kolya V. Korbel P. Kostka S.K. Kotelnikov T. Kramerkamper M.W. Krasny 2 H. Krehbiel D. Krucker K. Kruger A. Kupper H. Kuster M. Kuhlen T. Kurca W. Lachnit R. Lahmann D. Lamb M.P.J. Landon W. Lange U. Langenegger A. Lebedev F. Lehner V. Lemaitre R. Lemrani V. Lendermann S. Levonian 1 M. Lindstroem G. Lobo E. Lobodzinska V. Lubimov S. Luders D. Luke L. Lytkin N. Magnussen H. Mahlke-Kruger N. Malden E. Malinovsky I. Malinovski R. Maracek P. Marage J. Marks R. Marshall H.U. Martyn J. Martyniak S.J. Maxfield T.R. Mcmahon A. Mehta K. Meier P. Merkel F. Metlica A. Meyer H. Meyer J. Meyer 1 P.O. Meyer S. Mikocki D. Milstead R. Mohr S. Mohrdieck M. Mondragon F. Moreau 1 A. Morozov J.V. Morris D. Muller K. Muller P. Murn V. Nagovizin B. Naroska J. Naumann T. Naumann I. Negri 4 P.R. Newman H.K. Nguyen 2 T.C. Nicholls F. Niebergall C. Niebuhr C. Niedzballa H. Niggli O. Nix G. Nowak T. Nunnemann H. Oberlack J.E. Olsson D. Ozerov P. Palmen V. Panassik C. Pascaud 3 S. Passaggio G.D. Patel H. Pawletta Emile Perez J.P. Phillips A. Pieuchot 4 D. Pitzl R. Poschl G. Pope B. Povh K. Rabbertz J. Rauschenberger P. Reimer B. Reisert D. Reyna H. Rick S. Riess E. Rizvi P. Robmann R. Roosen K. Rosenbauer A. Rostovtsev 2 F. Rouse C. Royon S. Rusakov K. Rybicki D.P.C. Sankey P. Schacht J. Scheins F.P. Schilling S. Schleif P. Schleper D. Schmidt L. Schoeffel V. Schroder H.C. Schultz-Coulon F. Sefkow A. Semenov V. Shekelian I. Sheviakov L.N. Shtarkov G. Siegmon Y. Sirois 1 T. Sloan P. Smirnov M. Smith V. Solochenko Yu. Solovev V. Spaskov A. Specka 1 H. Spitzer F. Squinabol R. Stamen P. Steffen R. Steinberg J. Steinhart B. Stella A. Stellberger J. Stiewe U. Straumann W. Struczinski J.P. Sutton M. Swart S. Tapprogge M. Tasevsky V. Chernyshov S. Chechelnitsky J. Theissen G. Thompson P.D. Thompson N. Tobien R. Todenhagen D. Traynor P. Truol G. Tsipolitis J. Turnau E. Tzamariudaki S. Udluft A. Usik S. Valkar A. Valkarova C. Vallee 4 P. van Esch A. van Haecke P. van Mechelen Ya. Vazdik G. Villet K. Wacker R. Wallny T. Walter B. Waugh G. Weber M. Weber D. Wegener A. Wegner T. Wengler M. Werner L.R. West G. White S. Wiesand T. Wilksen S. Willard M. Winde G.G. Winter C. Wissing C. Wittek E. Wittmann M. Wobisch H. Wollatz E. Wunsch J. Zacek J. Zaleisak Zhiqing Zhang 3 A. Zhokin P. Zini 2 F. Zomer 3 J. Zsembery M. Zur Nedden
Abstract : The elastic electroproduction of rho mesons is studied at HERA with the H1 detector for a photon virtuality in the range 1 Q^2 60 GeV^2 and for a hadronic centre of mass energy in the range 30 W 140 GeV. The shape of the pipi mass distribution in the rho resonance region is measured as a function of Q^2. The full set of rho spin density matrix elements is determined, and evidence is found for a helicity flip amplitude at the level of 8 +- 3 % of the non-flip amplitudes. Measurements are presented of the dependence of the cross section on Q^2, W and t (the four-momentum transfer squared to the proton). They suggest that, especially at large Q^2, the gamma^*p cross section develops a stronger W dependence than that expected from the behaviour of elastic and total hadron-hadron cross sections.
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C. Adloff, V. Andreev, B. Andrieu, V. Arkadov, A. Astvatsatourov, et al.. Elastic Electroproduction of $\rho$ Mesons at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 13, pp.371-396. ⟨in2p3-00005180⟩

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