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Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production

We present the first measurement of the gluon polarisation in the nucleon based on the photon-gluon fusion process tagged by charmed meson production and decay to charged K and pi. The data were collected in polarised muon scattering off a polarised deuteron target by the COMPASS collaboration at CE...

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Detalles Bibliográficos
Autores principales: Alekseev, M., Alexakhin, V.Yu., Alexandrov, Yu., Alexeev, G.D., Amoroso, A., Arbuzov, A., Badelek, Barbara Maria, Balestra, F., Ball, J., Barth, J., Baum, Guenter, Bedfer, Y., Bernet, Colin, Bertini, R., Bettinelli, M., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, Franco, Brona, G., Burtin, E., Bussa, M.P., Chapiro, A., Chiosso, M., Cicuttin, A., Colantoni, M., Crespo, M.L., Dalla Torre, S., Dafni, T., Das, S., Dasgupta, S.S., De Masi, R., Dedek, N., Dhara, L., Diaz, V., Dinkelbach, A.M., Donskov, S.V., Dorofeev, V.A., Doshita, N., Duic, V., Dunnweber, W., Eversheim, P.D., Eyrich, W., Faessler, M., Falaleev, V., Ferrero, L., Finger, M., Finger, M., Jr., Fischer, H., Franco, C., Franz, J., Friedrich, J.M., Garfagnini, R., Gautheron, Fabrice, Gavrichtchouk, O.P., Gazda, R., Geyer, R., Giorgi, M., Gobbo, Benigno, Gorin, A.M., Grabmuller, S., Grajek, O.A., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Haas, F., Hannappel, J., von Harrach, D., Hasegawa, T., Heckmann, J., Hedicke, S., Heinsius, Fritz-Herbert, Hermann, R., Hess, C., Hinterberger, F., von Hodenberg, M., Horikawa, S., d'Hose, N., Ilgner, C., Ioukaev, A.I., Ishimoto, S., Ivanov, O., Ivanshin, Yu., Jahn, R., Janata, A., Jasinski, P., Joosten, R., Jouravlev, N.I., Kabuss, E., Kang, D., Ketzer, Bernhard, Khaustov, G.V., Khokhlov, Yu.A., Klein, F., Klimaszewski, K., Koblitz, S., Kolosov, V.N., Komissarov, E.V., Kondo, K., Konigsmann, Kay, Konstantinov, V.F., Korentchenko, A.S., Koutchinski, N.A., Kral, A., Kravchuk, N.P., Kroumchtein, Z.V., Kuhn, R., Kunne, Fabienne, Kurek, Krzysztof, Ladygin, M.E., Le Goff, Jean-Marc, Lednev, A.A., Lehmann, A., Levorato, S., Lichtenstadt, J., Liska, T., Ludwig, I., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G.K., Mann, A., Marchand, C., Marroncle, J., Martin, A., Marzec, J., Massmann, F., Matsuda, T., Meyer, W.Thomas, Mikhailov, Yu.V., Moinester, M.A., Nagaytsev, A., Nagel, T., Nahle, O., Nassalski, J., Neliba, S., Nerling, F., Neubert, S., Neyret, D.P., Nikolaenko, V.I., Nikolaev, K., Olshevsky, A.G., Ostrick, M., Padee, A., Pagano, P., Panebianco, S., Panknin, R., Panzieri, D., Paul, S., Pawlukiewicz-Kaminska, B., Peshekhonov, D.V., Peshekhonov, V.D., Piragino, G., Platchkov, Stephane, Pochodzalla, J., Polak, J., Polyakov, V.A., Pretz, J., Procureur, S., Quintans, C., Rajotte, J.F., Ramos, S., Rapatsky, V., Reicherz, G., Reggiani, D., Richter, A., Robinet, F., Rondio, Ewa, Rozhdestvensky, A.M., Ryabchikov, D.I., Samoylenko, V.D., Sandacz, A., Sapozhnikov, M.G., Sarkar, S., Savin, Igor A., Schiavon, P., Schill, Christian, Schonmeier, P., Schroder, W., Shevchenko, O.Yu., Silva, L., Sinha, L., Sissakian, A.N., Slunecka, M., Smirnov, G.I., Sosio, S., Sozzi, F., Srnka, A., Stinzing, F., Sugonyaev, V.P., Sulc, M., Sulej, R., Tchalishev, V.V., Tessaro, S., Tessarotto, F., Teufel, A., Tkatchev, L.G., Venugopal, G., Virius, M., Vlassov, N.V., Vossen, A., Webb, Robert C., Weitzel, Q., Windmolders, R., Wirth, S., Wislicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziegler, R., Zvyagin, A.
Lenguaje:eng
Publicado: 2008
Materias:
Acceso en línea:http://cds.cern.ch/record/1090440
Descripción
Sumario:We present the first measurement of the gluon polarisation in the nucleon based on the photon-gluon fusion process tagged by charmed meson production and decay to charged K and pi. The data were collected in polarised muon scattering off a polarised deuteron target by the COMPASS collaboration at CERN during 2002-2004. The result of this LO analysis is <Delta g/g>_x = -0.47 +- 0.44 (stat) +- 0.15 (syst) at <x> ~= 0.11 and a scale mu^2 ~ 13 (GeV/c)^2.