Elastic Photoproduction of ρ 0 Mesons at HERA H 1 Collaboration

Valeri P. Andreev,Bastien Andrieu, R. -D. Appuhn,Martine Arpagaus,Anton Babaev,Y. Ban,Pavel P. Baranov,Etienne Barrelet,R. Barschke,Wayne L. Bartel,Marie Barth,Ursula Bassler,H. P. 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,Wolfgang Braunschweig,Violette Brisson,Dusan Bruncko,C. Brune, Reiner Buchholz,A. Yu. Buniatian,Stephen Burke,M. J. Burton,Gerd W. Buschhorn,A. J. Campbell,Tancredi Carli,F. Charles,M. Charlet,D. P. Clarke,A. B. Clegg,Barbara Clerbaux, S. W. Cocks,Jesús Contreras, Carrie L Cormack,J. A. Coughlan,A. Courau,M. -C. Cousinou,Ch. Coutures,G. Cozzika,L. Criegee,David Cussans,Jaroslav Cvach, Sylvie Dagoret,J. B. Dainton,W. D. Dau,Karin Daum,M. David,C. L. Davis,Bruno Delcourt,Albert De Roeck,Eddi A. De Wolf, Michael Dirkmann,P. Dixon,Pasquale Di Nezza,W. Dlugosz,C. Dollfus,John D Dowell,H. B. Dreis,A. Droutskoi,H. Duhm,Jens Ebert, Tatjana Ebert,Guenter Eckerlin,V. Efremenko,Stephan Egli,Robert Eichler,Fred Louis Eisele,Eric Eisenhandler,R. J. Ellison,Eckhard Elsen,Martin Erdmann,Wolfram Erdmann, Étienne Évrard,A. B. Fahr,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,Frank Gaede,J. Garvey,J. L. Gayler,Matthias Gebauer,Andreas Gellrich,Herbert Genzel,Roland Gerhards,Alexandre Glazov,Ulrich Goerlach,Lars Goerlich,Nelly Gogitidze,M. Goldberg,D. Goldner, Krzysztof Golec-Biernat,B. González-Pineiro,I. V. Gorelov,Christoph Grab,Tim Greenshaw,G. Grindhammer,A. Gruber, Christoph Gruber, Johannes Haack,Dieter Haidt,Lubos Hajduk,M UniversityF. Hampel,Maciej Hapke,W. John Haynes,G. Heinzelmann, R. C. W. Henderson,Hans Henschel,I. Herynek, M. F. Hess,W. Hildesheim,K. H. Hiller, Connor D. Hilton,J. Hladk,K. C. Hoeger,D. Ho mann, Theodore C. Holtom,Roland Horisberger,V. L. Hudgson, Heinz Hufnagel,M. Ibbotson,H. Itterbeck,M. -A. Jabiol,A. Jacholkowska, Carl Magnus Gosta Jacobsson, Jürgen Janoth, T. E. Jansen, Klaus Johannsen,D. P. Johnson,L. Johnson,Hannes Jung,P. I. P. Kalmus, Mark Kander,David Kant,R. Kaschowitz,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,Michael Kuhlen, Julia Ofer,Didier Lacour,Bertrand Laforge, Francois Lamarche,Richard Lander,Murrough Landon,Wolfgang Lange,Urs Langenegger,P. Lanius,J. F. Laporte,A. Lebedev,Flavio Lehner, Carrie S. Leverenz,Sergey Levonian,Ch. Ley,M. Lindstroem, Jonathan Marion Link,F. Linsel, Józef Lipiński,Beatrice List,Georges Lobo,Peter Loch,H. Lohmander, Jeanette Lomas, Gabriela Carina López, V. N. Lubimov,Norbert Magnussen,E. I. Malinovski, S. Mani,Pierre Marage,Joerg Marks,Robin Marshall,J. Martens, Gonzalo Martin,Roland Martin,H. -U. Martyn, J. Martyniak,S. Masson,T. Mavroidis,S. J. Max eld,S. Mcmahon,Ankita Mehta,Karlheinz Meier, Tobias Merz,Andrée Meyer,H. J. Meyer,J. Meyer,P. Otto Meyer,Albert Migliori,Stanislav Mikocki,D. A. Milstead,J. Möck,François Moreau,J. V. Morris

semanticscholar（1995）

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摘要

The cross section for the elastic photoproduction of ρ mesons (γp → ρp) has been measured with the H1 detector at HERA for two average photon-proton centreof-mass energies of 55 and 187 GeV. The lower energy point was measured by observing directly the ρ decay giving a cross section of 9.1±0.9 (stat.)±2.5 (syst.) μb. The logarithmic slope parameter of the differential cross section, dσ/dt, is found to be 10.9 ± 2.4 (stat.)± 1.1 (syst.) GeV. The ρ decay polar angular distribution is found to be consistent with s-channel helicity conservation. The higher energy cross section was determined from analysis of the lower part of the hadronic invariant mass spectrum of diffractive photoproduction and found to be 13.6 ± 0.8 (stat.) ± 2.4 (syst.) μb. S. Aid, V. Andreev, B. Andrieu, R.-D. Appuhn, M. Arpagaus, A. Babaev, J. Bähr, J. Bán, Y. Ban, P. Baranov, E. Barrelet, R. Barschke, W. Bartel, M. Barth, U. Bassler, H.P. Beck, H.-J. Behrend, A. Belousov, Ch. Berger, G. Bernardi, R. Bernet, G. Bertrand-Coremans, M. Besançon, R. Beyer, P. Biddulph, P. Bispham, J.C. Bizot, V. Blobel, K. Borras, F. Botterweck, V. Boudry, A. Braemer, W. Braunschweig, V. Brisson, D. Bruncko, C. Brune, R. Buchholz, L. Büngener, J. Bürger, F.W. Büsser, A. Buniatian, S. Burke, M.J. Burton, G. Buschhorn, A.J. Campbell, T. Carli, F. Charles, M. Charlet, D. Clarke, A.B. Clegg, B. Clerbaux, S. Cocks, J.G. Contreras, C. Cormack, J.A. Coughlan, A. Courau, M.-C. Cousinou, Ch. Coutures, G. Cozzika, L. Criegee, D.G. Cussans, J. Cvach, S. Dagoret, J.B. Dainton, W.D. Dau, K. Daum, M. David, C.L. Davis, B. Delcourt, A. De Roeck, E.A. De Wolf, M. Dirkmann, P. Dixon, P. Di Nezza, W. Dlugosz, C. Dollfus, J.D. Dowell, H.B. Dreis, A. Droutskoi, D. Düllmann, O. Dünger, H. Duhm, J. Ebert, T.R. Ebert, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, R.J. Ellison, E. Elsen, M. Erdmann, W. Erdmann, E. Evrard, A.B. Fahr, L. Favart, A. Fedotov, D. Feeken, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, K. Flamm, M. Fleischer, M. Flieser, G. Flügge, A. Fomenko, B. Fominykh, M. Forbush, J. Formánek, J.M. Foster, G. Franke, E. Fretwurst, E. Gabathuler, K. Gabathuler, F. Gaede, J. Garvey, J. Gayler, M. Gebauer, A. Gellrich, H. Genzel, R. Gerhards, A. Glazov, U. Goerlach, L. Goerlich, N. Gogitidze, M. Goldberg, D. Goldner, K. Golec-Biernat, B. Gonzalez-Pineiro, I. Gorelov, C. Grab, H. Grässler, R. Grässler, T. Greenshaw, R. Griffiths, G. Grindhammer, A. Gruber, C. Gruber, J. Haack, D. Haidt, L. Hajduk, M. Hampel, M. Hapke, W.J. Haynes, G. Heinzelmann, R.C.W. Henderson, H. Henschel, I. Herynek, M.F. Hess, W. Hildesheim, K.H. Hiller, C.D. Hilton, J. Hladký, K.C. Hoeger, M. Höppner, D. Hoffmann, T. Holtom, R. Horisberger, V.L. Hudgson, M. Hütte, H. Hufnagel, M. Ibbotson, H. Itterbeck, M.-A. Jabiol, A. Jacholkowska, C. Jacobsson, M. Jaffre, J. Janoth, T. Jansen, L. Jönsson, K. Johannsen, D.P. Johnson, L. Johnson, H. Jung, P.I.P. Kalmus, M. Kander, D. Kant, R. Kaschowitz, U. Kathage, J. Katzy, H.H. Kaufmann, S. Kazarian, I.R. Kenyon, S. Kermiche, C. Keuker, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, W. Ko, T. Köhler, J.H. Köhne, H. Kolanoski, F. Kole, S.D. Kolya, V. Korbel, M. Korn, P. Kostka, S.K. Kotelnikov, T. Krämerkämper, M.W. Krasny, H. Krehbiel, D. Krücker, U. Krüger, U. Krüner-Marquis, H. Küster, M. Kuhlen, T. Kurča, J. Kurzhöfer, D. Lacour, B. Laforge, F. Lamarche, R. Lander, M.P.J. Landon, W. Lange, U. Langenegger, P. Lanius, J.-F. Laporte, A. Lebedev, F. Lehner, C. Leverenz, S. Levonian, Ch. Ley, G. Lindström, M. Lindstroem, J. Link, F. Linsel, J. Lipinski, B. List, G. Lobo, P. Loch, H. Lohmander, J.W. Lomas, G.C. Lopez, V. Lubimov, D. Lüke, N. Magnussen, E. Malinovski, S. Mani, R. Maraček, P. Marage, J. Marks, R. Marshall, J. Martens, G. Martin, R. Martin, H.-U. Martyn, J. Martyniak, S. Masson, T. Mavroidis, S.J. Maxfield, S.J. McMahon, A. Mehta, K. Meier, T. Merz, A. Meyer, A. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, A. Migliori, S. Mikocki, D. Milstead, J. Moeck, F. Moreau, J.V. Morris,

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