Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair

Ageev ES, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Badelek B, Balestra F, Ball J, Baum G, Bedfer Y, Berglund P, et al. (2006)
Phys.Lett. B 633(1): 25-32.

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Abstract
We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q(2) < 1 (GeV/c)(2), with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized (LiD)-Li-6 target. The helicity asymmetry for the selected events is (A(parallel to)/D) = 0.002 +/- 0.019(stat) +/- 0.003(syst). From this value, we obtain in a leading-order QCD analysis Delta G/G = 0.024 +/- 0.089(stat) +/- 0.057(syst) at x(g) = 0.095 and mu(2) similar or equal to 3 (GeV/c)(2). (c) 2005 Elsevier B.V. All rights reserved.
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Ageev ES, Alexakhin VY, Alexandrov Y, et al. Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair. Phys.Lett. B. 2006;633(1):25-32.
Ageev, E. S., Alexakhin, V. Y., Alexandrov, Y., Alexeev, G. D., Amoroso, A., Badelek, B., Balestra, F., et al. (2006). Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair. Phys.Lett. B, 633(1), 25-32.
Ageev, E. S., Alexakhin, V. Y., Alexandrov, Y., Alexeev, G. D., Amoroso, A., Badelek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., et al. (2006). Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair. Phys.Lett. B 633, 25-32.
Ageev, E.S., et al., 2006. Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair. Phys.Lett. B, 633(1), p 25-32.
E.S. Ageev, et al., “Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair”, Phys.Lett. B, vol. 633, 2006, pp. 25-32.
Ageev, E.S., Alexakhin, V.Y., Alexandrov, Y., Alexeev, G.D., Amoroso, A., Badelek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., Berglund, P., Bernet, C., Bertini, R., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., Brona, G., Burtin, E., Bussa, M.P., Bytchkov, V.N., Cerini, L., Chapiro, A., Cicuttin, A., Colantoni, M., Colavita, A.A., Costa, S., Crespo, M.L., Dalle Torre, S., Dasgupta, S.S., Dedek, N., De Masi, R., Denisov, O.Y., Dhara, L., Diaz, V., Dinkelbach, A.M., Dolgopolov, A.V., Donskov, S.V., Dorofeev, V.A., Doshita, N., Duic, V., Dunnweber, W., Ehlers, J., Eversheim, P.D., Eyrich, W., Fabro, M., Faessler, M., Falaleev, V., Fauland, P., Ferrero, A., Ferrero, L., Finger, M., Finger, M., Fischer, H., Franz, J., Friedrich, J.M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Geyer, R., Giorgi, M., Gobbo, B., Goertz, S., Gorin, A.M., Grajek, O.A., Grasso, A., Grube, B., Grunemaier, A., Hannappel, J., von Harrach, D., Hasegawa, T., Hedicke, S., Heinsius, F.H., Hermann, R., Hess, C., Hinterberger, F., von Hodenberg, M., Horikawa, N., Horikawa, S., d'Hose, N., Ijaduola, R.B., Ilgner, C., Ioukaev, A.I., Ishimoto, S., Ivanov, O., Iwata, T., Jahn, R., Janata, A., Joosten, R., Jouravlev, N.I., Kabuss, E., Kalinnikov, V., Kang, D., Karstens, F., Kastaun, W., Ketzer, B., Khaustov, G.V., Khokhlov, Y.A., Khomutov, N.V., Kisselev, Y., Klein, F., Koblitz, S., Koivuniemi, J.H., Kolosov, V.N., Komissarov, E.V., Kondo, K., Konigsmann, K., Konoplyannikov, A.K., Konorov, I., Konstantinov, V.F., Korentchenko, A.S., Korzenev, A., Kotzinian, A.M., Koutchinski, N.A., Kowalik, K., Kravchuk, N.P., Krivokhizhin, G.V., Kroumchtein, Z.V., Kuhn, R., Kunne, F., Kurek, K., Ladygin, M.E., Lamanna, M., Leberig, M., Le Goff, J.M., Lichtenstadt, J., Liska, T., Ludwig, I., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G.K., Manuilov, I.V., Marchand, C., Marroncle, J., Martin, A., Marzec, J., Matsuda, T., Maximov, A.N., Medved, K.S., Meyer, W., Mielech, A., Mikhailov, Y.V., Moinester, M.A., Nahle, O., Nassalski, J., Neliba, S., Neyret, D.P., Nikolaenko, V.I., Nozdrin, A.A., Obraztsov, V.F., Olshevsky, A.G., Ostrick, M., Padee, A., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pereira, H.D., Peshekhonov, D.V., Peshekhonov, V.D., Piragino, G., Platchkov, S., Platzer, K., Pochodzalla, J., Polyakov, V.A., Popov, A.A., Pretz, J., Procureur, S., Quintans, C., Ramos, S., Rebourgeard, P.C., Reicherz, G., Reymann, J., Rith, K., Rondio, E., Rozhdestvensky, A.M., Sadovski, A.B., Saller, E., Samoylenko, V.D., Sandacz, A., Sans, M., Sapozhnikov, M.G., Savin, I.A., Schiavon, P., Schill, C., Schmidt, T., Schmitt, H., Schmitt, L., Shevchenko, O.Y., Shishkin, A.A., Siebert, H.W., Sinha, L., Sissakian, A.N., Skachkova, A., Slunecka, M., Smirnov, G.I., Sozzi, F., Srnka, A., Stinzing, F., Stolarski, M., Sugonyaev, V.P., Sulc, M., Sulej, R., Takabayashi, N., Tchalishev, V.V., Tessarotto, F., Teufel, A., Thers, D., Tkatchev, L.G., Toeda, T., Tretyak, V.I., Trousov, S., Varanda, M., Virius, M., Vlassov, N.V., Wagner, M., Webb, R., Weise, E., Weitzel, Q., Wiedner, U., Wiesmann, M., Windmolders, R., Wirth, S., Wislicki, W., Zanetti, A.M., Zaremba, K., Zhao, J., Ziegler, R., Zvyagin, A.: Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair. Phys.Lett. B. 633, 25-32 (2006).
Ageev, ES, Alexakhin, VY, Alexandrov, Y, Alexeev, GD, Amoroso, A, Badelek, B, Balestra, F, Ball, J, Baum, Günter, Bedfer, Y, Berglund, P, Bernet, C, Bertini, R, Birsa, R, Bisplinghoff, J, Bordalo, P, Bradamante, F, Bravar, A, Bressan, A, Brona, G, Burtin, E, Bussa, MP, Bytchkov, VN, Cerini, L, Chapiro, A, Cicuttin, A, Colantoni, M, Colavita, AA, Costa, S, Crespo, ML, Dalle Torre, S, Dasgupta, SS, Dedek, N, De Masi, R, Denisov, OY, Dhara, L, Diaz, V, Dinkelbach, AM, Dolgopolov, AV, Donskov, SV, Dorofeev, VA, Doshita, N, Duic, V, Dunnweber, W, Ehlers, J, Eversheim, PD, Eyrich, W, Fabro, M, Faessler, M, Falaleev, V, Fauland, P, Ferrero, A, Ferrero, L, Finger, M, Finger, M, Fischer, H, Franz, J, Friedrich, JM, Frolov, V, Garfagnini, R, Gautheron, Fabrice, Gavrichtchouk, OP, Gerassimov, S, Geyer, R, Giorgi, M, Gobbo, B, Goertz, S, Gorin, AM, Grajek, OA, Grasso, A, Grube, B, Grunemaier, A, Hannappel, J, von Harrach, D, Hasegawa, T, Hedicke, S, Heinsius, FH, Hermann, R, Hess, C, Hinterberger, F, von Hodenberg, M, Horikawa, N, Horikawa, S, d'Hose, N, Ijaduola, RB, Ilgner, C, Ioukaev, AI, Ishimoto, S, Ivanov, O, Iwata, T, Jahn, R, Janata, A, Joosten, R, Jouravlev, NI, Kabuss, E, Kalinnikov, V, Kang, D, Karstens, F, Kastaun, W, Ketzer, B, Khaustov, GV, Khokhlov, YA, Khomutov, NV, Kisselev, Y, Klein, F, Koblitz, S, Koivuniemi, JH, Kolosov, VN, Komissarov, EV, Kondo, K, Konigsmann, K, Konoplyannikov, AK, Konorov, I, Konstantinov, VF, Korentchenko, AS, Korzenev, A, Kotzinian, AM, Koutchinski, NA, Kowalik, K, Kravchuk, NP, Krivokhizhin, GV, Kroumchtein, ZV, Kuhn, R, Kunne, F, Kurek, K, Ladygin, ME, Lamanna, M, Leberig, M, Le Goff, JM, Lichtenstadt, J, Liska, T, Ludwig, I, Maggiora, A, Maggiora, M, Magnon, A, Mallot, GK, Manuilov, IV, Marchand, C, Marroncle, J, Martin, A, Marzec, J, Matsuda, T, Maximov, AN, Medved, KS, Meyer, W, Mielech, A, Mikhailov, YV, Moinester, MA, Nahle, O, Nassalski, J, Neliba, S, Neyret, DP, Nikolaenko, VI, Nozdrin, AA, Obraztsov, VF, Olshevsky, AG, Ostrick, M, Padee, A, Pagano, P, Panebianco, S, Panzieri, D, Paul, S, Pereira, HD, Peshekhonov, DV, Peshekhonov, VD, Piragino, G, Platchkov, S, Platzer, K, Pochodzalla, J, Polyakov, VA, Popov, AA, Pretz, J, Procureur, S, Quintans, C, Ramos, S, Rebourgeard, PC, Reicherz, G, Reymann, J, Rith, K, Rondio, E, Rozhdestvensky, AM, Sadovski, AB, Saller, E, Samoylenko, VD, Sandacz, A, Sans, M, Sapozhnikov, MG, Savin, IA, Schiavon, P, Schill, C, Schmidt, T, Schmitt, H, Schmitt, L, Shevchenko, OY, Shishkin, AA, Siebert, HW, Sinha, L, Sissakian, AN, Skachkova, A, Slunecka, M, Smirnov, GI, Sozzi, F, Srnka, A, Stinzing, F, Stolarski, M, Sugonyaev, VP, Sulc, M, Sulej, R, Takabayashi, N, Tchalishev, VV, Tessarotto, F, Teufel, A, Thers, D, Tkatchev, LG, Toeda, T, Tretyak, VI, Trousov, S, Varanda, M, Virius, M, Vlassov, NV, Wagner, M, Webb, R, Weise, E, Weitzel, Q, Wiedner, U, Wiesmann, M, Windmolders, R, Wirth, S, Wislicki, W, Zanetti, AM, Zaremba, K, Zhao, J, Ziegler, R, and Zvyagin, A. “Gluon polarization in the nucleon from quasi-real photoproduction of high-(PT) hadron pair”. Phys.Lett. B 633.1 (2006): 25-32.
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