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Measurement of the spin-density matrix elements in exclusive electroproduction of ρ0 mesons at HERA

  • J. Breitweg
  • , S. Chekanov
  • , M. Derrick
  • , D. Krakauer
  • , S. Magill
  • , B. Musgrave
  • , A. Pellegrino
  • , J. Repond
  • , R. Stanek
  • , R. Yoshida
  • , M. C.K. Mattingly
  • , G. Abbiendi
  • , F. Anselmo
  • , P. Antonioli
  • , G. Bari
  • , M. Basile
  • , L. Bellagamba
  • , D. Boscherini
  • , A. Bruni
  • , G. Bruni
  • G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. de Pasquale, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, I. Brock, K. Coböken, J. Crittenden, R. Deffner, M. Eckert, H. Hartmann, K. Heinloth, E. Hilger, H. P. Jakob, A. Kappes, U. F. Katz, R. Kerger, E. Paul, J. Rautenberg, H. Schnurbusch, A. Stifutkin, J. Tandler, A. Weber, H. Wieber, D. S. Bailey, O. Barret, W. N. Cottingham, B. Foster, G. P. Heath, H. F. Heath, J. D. McFall, D. Piccioni, J. Scott, R. J. Tapper, M. Capua, A. Mastroberardino, M. Schioppa, G. Susinno, H. Y. Jeoung, J. Y. Kim, J. H. Lee, I. T. Lim, K. J. Ma, M. Y. Pac, A. Caldwell, W. Liu, X. Liu, B. Mellado, J. A. Parsons, S. Ritz, R. Sacchi, S. Sampson, F. Sciulli, J. Chwastowski, A. Eskreys, J. Figiel, K. Klimek, K. Olkiewicz, M. B. Przybycień, P. Stopa, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, A. M. Kowal, T. Kowalski, E. Rulikowska-Zarebska, L. Suszycki, J. Zajac, Z. Dulinński, A. Kotanński, L. A.T. Bauerdick, U. Behrens, J. K. Bienlein, C. Burgard, K. Desler, G. Drews, A. Fox-Murphy, U. Fricke, F. Goebel, P. Göttlicher, R. Graciani, T. Haas, W. Hain, G. F. Hartner, D. Hasell, K. Hebbel, K. F. Johnson, M. Kasemann, W. Koch, U. Kötz, H. Kowalski, L. Lindemann, B. Löhr, M. Martinez, J. Milewski, M. Milite, T. Monteiro, M. Moritz, D. Notz, F. Pelucchi, M. C. Petrucci, K. Piotrzkowski, M. Rohde, P. R.B. Saull, A. A. Savin, U. Schneekloth, O. Schwarzer, F. Selonke, M. Sievers, S. Stonjek, E. Tassi, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner, B. D. Burow, C. Coldewey, H. J. Grabosch, A. Lopez-Duran Viani, A. Meyer, K. Mönig, S. Schlenstedt, P. B. Straub, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, L. Votano, A. Bamberger, S. Eisenhardt, P. Markun, H. Raach, S. Wölfle, N. H. Brook, P. J. Bussey, A. T. Doyle, S. W. Lee, N. Macdonald, G. J. McCance, D. H. Saxon, L. E. Sinclair, I. O. Skillicorn, E. Strickland, R. Waugh, I. Bohnet, N. Gendner, U. Holm, A. Meyer-Larsen, H. Salehi, K. Wick, A. Garfagnini, I. Gialas, L. K. Gladilin, D. Kçira, R. Klanner, E. Lohrmann, G. Poelz, F. Zetsche, T. C. Bacon, J. E. Cole, G. Howell, L. Lamberti, K. R. Long, D. B. Miller, A. Prinias, J. K. Sedgbeer, D. Sideris, A. D. Tapper, R. Walker, U. Mallik, S. M. Wang, P. Cloth, D. Filges, T. Ishii, M. Kuze, I. Suzuki, K. Tokushuku, S. Yamada, K. Yamauchi, Y. Yamazaki, S. H. Ahn, S. H. An, S. J. Hong, S. B. Lee, S. W. Nam, S. K. Park, H. Lim, I. H. Park, D. Son, F. Barreiro, J. P. Fernández, G. García, C. Glasman, J. M. Hernández, L. Labarga, J. del Peso, J. Puga, I. Redondo, J. Terrón, F. Corriveau, D. S. Hanna, J. Hartmann, W. N. Murray, A. Ochs, S. Padhi, M. Riveline, D. G. Stairs, M. St-Laurent, M. Wing, T. Tsurugai, V. Bashkirov, B. A. Dolgoshein, G. L. Bashindzhagyan, P. F. Ermolov, Y. A. Golubkov, L. A. Khein, N. A. Korotkova, I. A. Korzhavina, V. A. Kuzmin, O. Y. Lukina, A. S. Proskuryakov, L. M. Shcheglova, A. N. Solomin, S. A. Zotkin, C. Bokel, M. Botje, N. Brümmer, J. Engelen, E. Koffeman, P. Kooijman, A. van Sighem, H. Tiecke, N. Tuning, J. J. Velthuis, W. Verkerke, J. Vossebeld, L. Wiggers, E. de Wolf, D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, T. Y. Ling, P. Nylander, H. E. Blaikley, S. Boogert, R. J. Cashmore, A. M. Cooper-Sarkar, R. C.E. Devenish, J. K. Edmonds, J. Große-Knetter, N. Harnew, T. Matsushita, V. A. Noyes, A. Quadt, O. Ruske, M. R. Sutton, R. Walczak, D. S. Waters, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, S. Dondana, U. Dosselli, S. Dusini, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, L. Iannotti, B. Y. Oh, J. R. Okrasiński, W. S. Toothacker, J. J. Whitmore, Y. Iga, G. D'Agostini, G. Marini, A. Nigro, M. Raso, C. Cormack, J. C. Hart, N. A. McCubbin, T. P. Shah, D. Epperson, C. Heusch, H. F.W. Sadrozinski, A. Seiden, R. Wichmann, D. C. Williams, N. Pavel, H. Abramowicz, S. Dagan, S. Kananov, A. Kreisel, A. Levy, T. Abe, T. Fusayasu, M. Inuzuka, K. Nagano, K. Umemori, T. Yamashita, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Nishimura, M. Arneodo, N. Cartiglia, R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, V. Monaco, C. Peroni, M. Ruspa, A. Solano, A. Staiano, M. Dardo, D. C. Bailey, C. P. Fagerstroem, R. Galea, T. Koop, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, A. Sabetfakhri, D. Simmons, J. M. Butterworth, C. D. Catterall, M. E. Hayes, E. A. Heaphy, T. W. Jones, J. B. Lane, B. J. West, J. Ciborowski, R. Ciesielski, G. Grzelak, R. J. Nowak, J. M. Pawlak, R. Pawlak, B. Smalska, T. Tymieniecka, A. K. Wróblewski, J. A. Zakrzewski, A. F. Zarnecki, M. Adamus, T. Gadaj, O. Deppe, Y. Eisenberg, D. Hochman, U. Karshon, W. F. Badgett, D. Chapin, R. Cross, C. Foudas, S. Mattingly, D. D. Reeder, W. H. Smith, A. Vaiciulis, T. Wildschek, M. Wodarczyk, A. Deshpande, S. Dhawan, V. W. Hughes, S. Bhadra, W. R. Frisken, R. Hall-Wilton, M. Khakzad, S. Menary, W. B. Schmidke
  • Argonne National Laboratory
  • Andrews University
  • National Institute for Nuclear Physics
  • German Electron Synchrotron
  • IROE Florence
  • University of Salerno
  • University of Bonn
  • BSG Systemplanung AG
  • Drafted to the German military service
  • University of Bristol
  • University of Hamburg
  • University of Calabria
  • Chonnam National University
  • Dongshin University
  • Columbia University
  • NASA Goddard Space Flight Center
  • Institute of Nuclear Physics
  • AGH University of Krakow
  • Jagiellonian University in Kraków
  • Massachusetts Institute of Technology
  • Florida State University
  • Fermi National Accelerator Laboratory
  • ATM
  • CERN
  • ESG Elektroniksystem und Logistik GmbH
  • Independent researcher in computing
  • University of Florence
  • University of Freiburg
  • University of Edinburgh
  • University of Glasgow
  • University of Crete
  • Imperial College London
  • University of Iowa
  • Jülich Research Centre
  • High Energy Accelerator Research Organization, Institute of Particle and Nuclear Physics
  • The University of Osaka
  • The University of Tokyo
  • Korea University
  • Wayne State University
  • Kyungpook National University
  • Universidad Autónoma de Madrid
  • McGill University
  • Debis Systemhaus
  • Meiji Gakuin University
  • Moscow Engineering Physics Institute
  • Loma Linda University Health
  • Lomonosov Moscow State University
  • University of Amsterdam
  • Ohio State University
  • University of Florida
  • University of Oxford
  • Dirac House
  • University of Padua
  • Pennsylvania State University
  • Polytechnic University Japan
  • University of Rome La Sapienza
  • STFC Rutherford Appleton Laboratory
  • University of California at Santa Cruz
  • University of Siegen
  • Tel Aviv University
  • Tokyo Metropolitan University
  • University of Turin
  • University of Eastern Piedmont
  • University of Toronto
  • University College London
  • University of Warsaw
  • Institute of Nuclear Chemistry and Technology, Warsaw
  • Weizmann Institute of Science
  • University of Wisconsin-Madison
  • University of Rochester
  • Yale University
  • York University Toronto

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

Exclusive electroproduction of ρ0 mesons has been measured using the ZEUS detector at HERA in two Q2 ranges, 0.25 < Q2 < 0.85 GeV2 and 3 < Q2 < 30 GeV2. The low-Q2 data span the range 20 < W < 90 GeV; the high-Q2 data cover the 40 < W < 120 GeV interval. Both samples extend up to four-momentum transfers of |t| = 0.6 GeV2. The distribution in the azimuthal angle between the positron scattering plane and the ρ0 production plane shows a small but significant violation of s-channel helicity conservation, corresponding to the production of longitudinally polarised (i.e. helicity zero) ρ0 mesons from transverse photons. Measurements of the 15 combinations of spin-density matrix elements which completely define the angular distributions are presented and discussed.

Original languageEnglish
Pages (from-to)393-410
Number of pages18
JournalEuropean Physical Journal C
Volume12
Issue number3
DOIs
StatePublished - 2000

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