First measurement of transferred polarization in the exclusive ep to e'K/sup +/ Lambda reaction

Carman, D.S. et al. (2003) First measurement of transferred polarization in the exclusive ep to e'K/sup +/ Lambda reaction. Physical Review Letters, 90(13), p. 131804. (doi: 10.1103/PhysRevLett.90.131804)

Abstract

The first measurements of the transferred polarization for the exclusive ep to e'K + Lambda reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q/sup 2/ from 0.3 to 1.5 (GeV/c)/sup 2/, W from 1.6 to 2.15 GeV, and over the full K/sup +/ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the ss quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Branford, Prof Derek and Melone, Mr John and Livingston, Dr Kenneth and Guo, Miss Lixin and Protopopescu, Dr Dan and Guidal, Dr Michel and Kellie, Dr James
• Authors: Carman, D.S., Joo, K., Mestayer, M.D., Raue, B.A., Adams, G., Ambrozewicz, P., Anciant, E., Anghinolfi, M., Armstrong, D.S., Asavapibhop, B., Audit, G., Auger, T., Avakian, H., Bagdasaryan, H., Balls, J.P., Barrow, S.P., Battaglieri, M., Beard, K., Bektasoglu, M., Bellis, M., Bennhold, C., Bianchi, N., Biselli, A.S., Boiarinov, S., Bonner, B.E., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Butuceanu, C., Calarco, J.R., Carnahan, B., Cazes, A., Cetina, C., Ciciani, L., Clark, R., Cole, P.L., Coleman, A., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J.P., DeSanctis, E., Degtyarenko, P.V., Denizli, H., Dennis, L., DeVita, R., Dharmawardane, K.V., Dhuga, K.S., Djalali, C., Dodge, G.E., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., Dzyubak, O.P., Eckhause, M., Egiyan, H., Egiyan, K.S., Elouadrhiri, L., Empl, A., Eugenio, P., Fatemi, R., Fedotov, G., Feuerbach, R.J., Ficenec, J., Forest, T.A., Funsten, H., Gaff, S.J., Gai, M., Garcon, M., Gavalian, G., Gilad, S., Gilfoyle, G.P., Giovanetti, K.L., Girard, P., Golovach, E., Gordon, C.I.O., Griffioen, K., Grimes, S., Guidal, M., Guillo, M., Guo, L., Gyurjyan, V., Hadjidakis, C., Hakobyan, R.S., Hardie, J., Heddle, D., Heimberg, P., Hersman, F.W., Hicks, K., Hicks, R.S., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ishkhanov, B., Ito, M.M., Jenkins, D., Kelley, J.H., Kellie, J.D., Khandaker, M., Kim, K.Y., Kim, K., Kim, W., Klein, A., Klein, F.J., Klimenko, A.V., Klusman, M., Kossov, M., Kramer, L.H., Kuang, Y., Kuhn, S.E., Kuhn, J., Lachniet, J., Laget, J.M., Lawrence, D., Li, J., Livingston, K., Longhi, A., Lukashin, K., Manak, J.J., Marchand, C., Mart, T., McAleer, S., McCarthy, J., McNabb, J.W.C., Mecking, B.A., Mehrabyan, S., Melone, J.J., Meyer, C.A., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mokeev, V., Morand, L., Morrow, S.A., Mozer, M.U., Muccifora, V., Mueller, J., Murphy, L.Y., Mutchler, G.S., Napolitano, J., Nasseripour, R., Nelson, S.O., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niyazov, R.A., Nozar, M., O'Rielly, G.V., Opper, A.K., Osipenko, M., Park, K., Paschke, K., Pasyuk, E., Peterson, G., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B.M., Price, J.W., Prok, Y., Protopopescu, D., Qin, L., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P., Sabatie, F., Sabourov, K., Salgado, C., Santoro, J., Sapunenko, V., Schumacher, R.A., Serov, V.S., Sharabian, Y.G., Shaw, J., Simionatto, S., Skabelin, A.V., Smith, E.S., Smith, L.C., Sober, D.I., Spraker, M., Stavinsky, A., Stepanyan, S., Stoler, P., Taiuti, M., Taylor, S., Tedeschi, D.J., Thoma, U., Thompson, R., Todor, L., Tur, C., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Wang, K., Weinstein, L.B., Weller, H., Weygand, D.P., Whisnant, C.S., Wolin, E., Wood, M.H., Yegneswaran, A., Yun, J., Zhang, B., Zhao, J., and Zhou, Z.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114