Measurement of the spin-density matrix elements in exclusive electroproduction of rho(0) mesons at HERA
- Breitweg, J.
- Chekanov, S.
- Derrick, M.
- Krakauer, D.
- Magill, S.
- Musgrave, B.
- Pellegrino, A.
- Repond, J.
- Stanek, R.
- Yoshida, R.
- Mattingly, M.C.K.
- Abbiendi, G.
- Anselmo, F.
- Antonioli, P.
- Bari, G.
- Basile, M.
- Bellagamba, L.
- Boscherini, D.
- Bruni, A.
- Bruni, G.
- Romeo, G.C.
- Castellini, G.
- Cifarelli, L.
- Cindolo, F.
- Contin, A.
- Coppola, N.
- Corradi, M.
- de Pasquale, S.
- Giusti, P.
- Iacobucci, G.
- Laurenti, G.
- Levi, G.
- Margotti, A.
- Massam, T.
- Nania, R.
- Palmonari, F.
- Pesci, A.
- Polini, A.
- Sartorelli, G.
- Garcia, Y.Z.
- Zichichi, A.
- Amelung, C.
- Bornheim, A.
- Brock, I.
- Coboken, K.
- Crittenden, J.
- Deffner, R.
- Eckert, M.
- Hartmann, H.
- Heinloth, K.
- Hilger, E.
- Jakob, H.P.
- Kappes, A.
- Katz, U.F.
- Kerger, R.
- Paul, E.
- Rautenberg, J.
- Schnurbusch, H.
- Stifutkin, A.
- Tandler, J.
- Weber, A.
- Wieber, H.
- Bailey, D.S.
- Barret, O.
- Cottingham, W.N.
- Foster, B.
- Heath, G.P.
- Heath, H.F.
- McFall, J.D.
- Piccioni, D.
- Scott, J.
- Tapper, R.J.
- Capua, M.
- Mastroberardino, A.
- Schioppa, M.
- Susinno, G.
- Jeoung, H.Y.
- Kim, J.Y.
- Lee, J.H.
- Lim, I.T.
- Ma, K.J.
- Pac, M.Y.
- Caldwell, A.
- Liu, W.
- Liu, X.
- Mellado, B.
- Parsons, J.A.
- Ritz, S.
- Sacchi, R.
- Sampson, S.
- Sciulli, F.
- Chwastowski, J.
- Eskreys, A.
- Figiel, J.
- Klimek, K.
- Olkiewicz, K.
- Przybycien, M.B.
- Stopa, P.
- Zawiejski, L.
- Adamczyk, L.
- Bednarek, B.
- Jelen, K.
- Kisielewska, D.
- Kowal, A.M.
- Kowalski, T.
- Przybycien, M.
- Rulikowska-Zarebska, E.
- Suszycki, L.
- Zajac, J.
- Dulinski, Z.
- Kotanski, A.
- Bauerdick, L.A.T.
- Behrens, U.
- Bienlein, J.K.
- Burgard, C.
- Desler, K.
- Drews, G.
- Fox-Murphy, A.
- Fricke, U.
- Goebel, F.
- Gottlicher, P.
- Graciani, R.
- Haas, T.
- Hain, W.
- Hartner, G.F.
- Hasell, D.
- Hebbel, K.
- Johnson, K.F.
- Kasemann, M.
- Koch, W.
- Kotz, U.
- Kowalski, H.
- Lindemann, L.
- Lohr, B.
- Martinez, M.
- Milewski, J.
- Milite, M.
- Monteiro, T.
- Moritz, M.
- Notz, D.
- Pelucci, F.
- Petrucci, M.C.
- Piotrzkowski, K.
- Rohde, M.
- Saull, P.R.B.
- Savin, A.A.
- Schneekloth, U.
- Schwarzer, O.
- Selonke, F.
- Sievers, M.
- Stonjek, S.
- Tassi, E.
- Wolf, G.
- Wollmer, U.
- Youngman, C.
- Zeuner, W.
- Burow, B.D.
- Coldewey, C.
- Grabosch, H.J.
- Viani, A.L.D.
- Meyer, A.
- Monig, K.
- Schlenstedt, S.
- Straub, P.B.
- Barbagli, G.
- Gallo, E.
- Pelfer, P.
- Maccarrone, G.
- Votano, L.
- Bamberger, A.
- Eisenhardt, S.
- Markun, P.
- Raach, H.
- Wolfle, S.
- Brook, N.H.
- Bussey, P.J.
- Doyle, A.T.
- Lee, S.W.
- Macdonald, N.
- McCance, G.J.
- Saxon, D.H.
- Sinclair, L.E.
- Skillicorn, I.O.
- Strickland, E.
- Waugh, R.
- Bohnet, I.
- Gendner, N.
- Holm, U.
- Meyer-Larsen, A.
- Salehi, H.
- Wick, K.
- Garfagnini, A.
- Gialas, I.
- Gladilin, L.K.
- Kcira, D.
- Klanner, R.
- Lohrmann, E.
- Poelz, G.
- Zetsche, F.
- Bacon, T.C.
- Cole, J.E.
- Howell, G.
- Lamberti, L.
- Long, K.R.
- Miller, D.B.
- Prinias, A.
- Sedgbeer, J.K.
- Sideris, D.
- Tapper, A.D.
- Walker, R.
- Mallik, U.
- Wang, S.M.
- Cloth, P.
- Filges, D.
- Ishii, T.
- Kuze, M.
- Suzuki, I.
- Tokushuku, K.
- Yamada, S.
- Yamauchi, K.
- Yamazaki, Y.
- Ahn, S.H.
- An, S.H.
- Hong, S.J.
- Lee, S.B.
- Nam, S.W.
- Park, S.K.
- Lim, H.
- Park, I.H.
- Son, D.
- Barreiro, F.
- Fernandez, J.P.
- Garcia, G.
- Glasman, C.
- Hernandez, J.M.
- Labarga, L.
- del Peso, J.
- Puga, J.
- Redondo, I.
- Terron, J.
- Corriveau, F.
- Hanna, D.S.
- Hartmann, J.
- Murray, W.N.
- Ochs, A.
- Padhi, S.
- Riveline, M.
- Stairs, D.G.
- St Laurent, M.
- Wing, M.
- Tsurugai, T.
- Bashkirov, V.
- Dolgoshein, B.A.
- Bashindzhagyan, G.L.
- Ermolov, P.F.
DOIAbstract
Exclusive electroproduction of rho(o) mesons has been measured using the ZEUS detector at HERA in two Q(2) ranges, 0.25 lt Q(2) lt 0.85 GeV2 and 3 lt Q(2) lt 30 GeV2. The low-Q(2) data span the range 20 lt W lt 90 GeV; the high-Q(2) data cover the 40 lt W lt 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 rho(o) production plane shows a small but significant violation of s- channel helicity conservation, corresponding to the production of longitudinally polarised (i.e, helicity zero) rho(o) mesons from transverse photons. Measurements of the 15 combinations of spin-density matrix elements which complet...
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