Measurement of the spin-density matrix elements in exclusive electroproduction of rho(0) mesons at HERA

Breitweg, J. et al. (2000) Measurement of the spin-density matrix elements in exclusive electroproduction of rho(0) mesons at HERA. European Physical Journal C, 12(3), 393 -410. (doi: 10.1007/s100529900246)

Abstract

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 completely define the angular distributions are presented and discussed.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Saxon, Professor David and Bussey, Dr Peter and Doyle, Professor Anthony and Skillicorn, Professor Ian
• Authors: 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., and Ermolov, P.F.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: European Physical Journal C
• ISSN: 1434-6044