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Search for Odderon-Induced Contributions to Exclusive $\pi^0$ Photoproduction at HERA

C. Adloff V. Andreev B. Andrieu 1 T. Anthonis V. Arkadov A. Astvatsatourov A. Babaev J. Bahr P. Baranov E. Barrelet 2 W. Bartel J. Becker A. Beglarian O. Behnke C. Beier A. Belousov C. Berger T. Berndt J.C. Bizot 3 J. Bohme V. Boudry 1 W. Braunschweig V. Brisson 3 H.B. Broker D.P. Brown D. Bruncko J. Burger F.W. Busser A. Bunyatyan A. Burrage G. Buschhorn L. Bystritskaya A.J. Campbell J. Cao S. Caron F. Cassol-Brunner 4 D. Clarke C. Collard J.G. Contreras Y.R. Coppens J.A. Coughlan M.C. Cousinou 4 B.E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum B. Delcourt N. Delerue 4 R. Demirchyan A. de Roeck E.A. de Wolf C. Diaconu 4 J. Dingfelder P. Dixon V. Dodonov J.D. Dowell A. Droutskoi A. Dubak C. Duprel G. Eckerlin D. Eckstein V. Efremenko S. Egli R. Eichler F. Eisele E. Eisenhandler M. Ellerbrock E. Elsen M. Erdmann W. Erdmann P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Ferencei S. Ferron 1 M. Fleischer Y.H. Fleming G. Flugge A. Fomenko I. Foresti J. Formanek E. Gabathuler K. Gabathuler J. Garvey J. Gassner J. Gayler R. Gerhards C. Gerlich S. Ghazaryan L. Goerlich N. Gogitidze C. Grab V. Grabski H. Grassler T. Greenshaw G. Grindhammer T. Hadig D. Haidt L. Hajduk J. Haller W.J. Haynes B. Heinemann G. Heinzelmann R.C.W. Henderson H. Henschel R. Heremans G. Herrera I. Herynek M. Hildebrandt M. Hilgers K.H. Hiller J. Hladky P. Hoting D. Hoffmann 4 R. Horisberger S. Hurling M. Ibbotson M. Jacquet 3 M. Jaffre 3 L. Janauschek X. Janssen V. Jemanov L. Jonsson C. Johnson D.P. Johnson M.A.S. Jones H. Jung D. Kant M. Kapichine M. Karlsson O. Karschnick F. Keil N. Keller J. Kennedy I.R. Kenyon S. Kermiche 4 C. Kiesling M. Klein C. Kleinwort T. Kluge G. Knies B. Koblitz S.D. Kolya V. Korbel P. Kostka S.K. Kotelnikov R. Koutouev A. Koutov H. Krehbiel K. Kruger A. Kupper T. Kuhr T. Kurca D. Lamb M.P.J. Landon W. Lange T. Lastovicka P. Laycock E. Lebailly A. Lebedev B. Leiner V. Lendermann S. Levonian M. Lindstroem B. List E. Lobodzinska B. Lobodzinski A. Loginov N. Loktionova V. Lubimov S. Luders D. Luke H. Mahlke-Kruger N. Malden E. Malinovski I. Malinovski R. Maracek P. Marage J. Marks R. Marshall H.U. Martyn J. Martyniak S.J. Maxeld A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer P.O. Meyer S. Mikocki D. Milstead T. Mkrtchyan R. Mohr S. Mohrdieck M.N. Mondragon F. Moreau 1 A. Morozov J.V. Morris K. Muller P. Murn V. Nagovizin B. Naroska J. Naumann T. Naumann G. Nellen P.R. Newman F. Niebergall O. Nix G. Nowak J.E. Olsson D. Ozerov V. Panassik C. Pascaud G.D. Patel M. Peez 4 Emile Perez J.P. Phillips D. Pitzl R. Poschl I. Potachnikova B. Povh G. Radel J. Rauschenberger P. Reimer B. Reisert D. Reyna C. Risler E. Rizvi P. Robmann R. Roosen A. Rostovtsev S. Rusakov K. Rybicki D.P.C. Sankey S. Schatzel J. Scheins F.P. Schilling P. Schleper D. Schmidt S. Schmidt S. Schmitt M. Schneider 4 L. Schoeffel A. Schoning V. Schroder H.C. Schultz-Coulon C. Schwanenberger K. Sedlak F. Sefkow V. Shekelyan I. Sheviakov L.N. Shtarkov Y. Sirois 1 T. Sloan Y. Soloviev D. South V. Spaskov A. Specka 1 H. Spitzer R. Stamen B. Stella J. Stiewe U. Straumann M. Swart M. Tasevsky S. Tchetchelnitski G. Thompson P.D. Thompson N. Tobien F. Tomasz D. Traynor P. Truol G. Tsipolitis I. Tsurin J. Turnau J.E. Turney E. Tzamariudaki S. Udluft Martin Urban A. Usik S. Valkar A. Valkarova C. Vallee 4 P. van Mechelen S. Vassiliev Y. Vazdik A. Vichnevski M. Vorobev K. Wacker J. Wagner R. Wallny G. Weber M. Weber D. Wegener C. Werner M. Werner N. Werner M. Wessels G. White S. Wiesand T. Wilksen M. Winde G.G. Winter M. Wobisch E.E. Woehrling E. Wunsch A.C. Wyatt J. Zacek J. Zalesak Zhiqing Zhang 3 A. Zhokin F. Zomer 3 M. Zur Nedden
Abstract : A search for contributions to the reaction ep-> e pi^0 N^* from photon-Odderon fusion in the photoproduction regime at HERA is reported, at an average photon-proton centre-of-mass energy = 215 GeV. The measurement proceeds via detection of the pi^0 decay photons, a leading neutron from the N^* decay, and the scattered electron. No pi^0 signal is observed and an upper limit on the cross section for the photon-Odderon fusion process of sigma(gamma p -> pi^0 N^*) < 49 nb at the 95% confidence level is derived, integrated over the experimentally accessible range of the squared four-momentum transfer at the nucleon vertex 0.02 < |t| < 0.3 Gev^2. This excludes a recent prediction from a calculation based on a non-perturbative QCD model of a photon-Odderon fusion cross section above 200 nb.
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Submitted on : Tuesday, November 5, 2002 - 10:00:39 AM
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C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, V. Arkadov, et al.. Search for Odderon-Induced Contributions to Exclusive $\pi^0$ Photoproduction at HERA. Physics Letters B, Elsevier, 2002, 544, pp.35-43. ⟨in2p3-00011812⟩

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