The Polarised Valence Quark Distribution from semi-inclusive DIS
| Autor: | A. Padee, Yu. Alexandrov, Norihiro Doshita, P. Schiavon, N. d'Hose, Laura Silva, Sayantan Sarkar, A. N. Sissakian, A. Bravar, A. Chapiro, S. Sosio, V. Diaz, K. Klimaszewski, M. Maggiora, G. D. Alexeev, W. Dünnweber, A. Zvyagin, Soumen Paul, H. Santos, F. Tessarotto, M. Chiosso, Andres Cicuttin, R. Kuhn, S. Dasgupta, J. Polak, D. Kang, K. Königsmann, C. Franco, V.N. Kolosov, C. Ilgner, J. Nassalski, O. Nähle, J. Zhao, G. Reicherz, S. Dalla Torre, M.G. Sapozhnikov, V.A. Dorofeev, Christian Schill, T. Nagel, J. Pretz, L. Ferrero, Jean-Francois Rajotte, R. Gazda, Massimo Lamanna, Yu. Kisselev, C. Quintans, D.I. Ryabchikov, Colin Bernet, A. Srnka, T. Hasegawa, O.P. Gavrichtchouk, D.V. Peshekhonov, M. Stolarski, G.V. Khaustov, A. Maggiora, J. Franz, S. Das, A.S. Korentchenko, D. Panzieri, G.I. Smirnov, Fabrice Gautheron, L. Sinha, M. Ostrick, M. A. Faessler, Andrej Arbuzov, S. Procureur, T. Liška, O.A. Grajek, R. Jahn, A. Ferrero, Achim Richter, F. Massmann, S. Ramos, N.I. Jouravlev, S. Horikawa, V.Yu. Alexakhin, W. Meyer, Maria Liz Crespo, D. Neyret, A. Sandacz, L. Dhara, B. Badelek, T. Dafni, A. Mutter, K. Kurek, A. Guskov, M. Bettinelli, N.V. Vlassov, V.P. Sugonyaev, T. Matsuda, G. Venugopal, S. Koblitz, R. Sulej, O.Yu. Denisov, F. Kunne, A.A. Lednev, K. Zaremba, Günter Baum, O.Yu. Shevchenko, S. Levorato, Andrea Bressan, Franco Bradamante, I. Ludwig, G. Piragino, V.A. Polyakov, J. Marzec, B. Ketzer, S. Grabmüller, F. Robinet, L. G. Tkatchev, A.M. Rozhdestvensky, Z.V. Kroumchtein, E.V. Komissarov, F. Nerling, A. Maximov, J. Heckmann, M. Giorgi, R. Panknin, A. Lehmann, St. Goertz, V.I. Nikolaenko, A. Amoroso, V.D. Samoylenko, Elena Rocco, J. Ball, S. Hedicke, J.M. Friedrich, L. Schmitt, E. M. Kabuß, A. Mann, R. Garfagnini, J. Pochodzalla, A.I. Ioukaev, M. Finger, J. Bisplinghoff, F. Stinzing, R. Gushterski, Yu.V. Mikhailov, R. De Masi, P. Bordalo, Alan D. Martin, I.A. Savin, A. Janata, A. Grasso, M. L. Colantoni, Oleg V. Ivanov, H. Wollny, M. V. Zavertyaev, E. Zemlyanichkina, Paolo Pagano, Takahiro Iwata, E. Rondio, D. von Harrach, P. Schönmeier, M. Slunecka, V. Falaleev, C. Heß, E. Burtin, C. Marchand, V.F. Konstantinov, J. Marroncle, O.M. Kouznetsov, N. Dedek, W. Wiślicki, Murray Moinester, Q. Weitzel, J. M. Le Goff, S. Neubert, S. Wirth, J. Hannappel, V. Duic, B. Gobbo, Miroslav Sulc, F. Hinterberger, M. Virius, Vladimir Peshekhonov, R. Birsa, E. Weise, W. Schröder, J. Lichtenstadt, H. Fischer, B. Grube, P.D. Eversheim, V. Frolov, R. C. Webb, A. Teufel, A. Mielech, S. Ishimoto, Frank Klein, M.E. Ladygin, S. Platchkov, N.A. Koutchinski, R. Hermann, Yu. Ivanshin, A. Gorin, S. Gerassimov, N. Horikawa, Sergey Donskov, S. Tessaro, Yu.A. Khokhlov, H. W. Siebert, J. Barth, Grzegorz Brona, Gerhard K. Mallot, A. Vossen, F. Sozzi, Aram Kotzinian, A. Král, R. Windmolders, K. Nikolaev, P. Jasinski, V.V. Tchalishev, S. Costa, J.H. Koivuniemi, S. Panebianco, B. Pawlukiewicz-Kaminska, V. Rapatsky, F.H. Heinsius, A.G. Olshevsky, A. Magnon, I. Konorov, A. Korzenev, D. Reggiani, A. Nagaytsev, F. Balestra, S. Neliba, F. Haas, R. Geyer, N.P. Kravchuk, W. Eyrich, R. Bertini, A.M. Dinkelbach, M. von Hodenberg, K. Kondo, Maria Pia Bussa, Y. Bedfer, M. Alekseev, R. Joosten, R. Ziegler |
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| Přispěvatelé: | Alekseev, M, ALEXAKHIN V., Yu, Alexandrov, Yu, ALEXEEV G., D, Amoroso, A, Arbuzov, A, Badelek, B, Balestra, F, Ball, J, Barth, J, Baum, G, Bedfer, Y, Bernet, C, Bertini, R, Bettinelli, M, Birsa, R, Bisplinghoff, J, Bordalo, P, Bradamante, Franco, Bravar, A, Bressan, Andrea, Brona, G, Burtin, E, BUSSA M., P, Chapiro, A, Chiosso, M, Cicuttin, A, Colantoni, M, Costa, S, CRESPO M., L, DALLA TORRE, S, Dafni, T, Das, S, DASGUPTA S., S, DE MASI, R, Dedek, N, DENISOV O., Yu, Dhara, L, Diaz, V, DINKELBACH A., M, DONSKOV S., V, DOROFEEV V., A, Doshita, N, Duic, V, Dünnweber, W, EVERSHEIM P., D, Eyrich, W, Faessler, M, Falaleev, V, Ferrero, A, Ferrero, L, Finger, M, FINGER M., Jr, Fischer, H, Franco, C, Franz, J, FRIEDRICH J., M, Frolov, V, Garfagnini, R, Gautheron, F, GAVRICHTCHOUK O., P, Gazda, R, Gerassimov, S, Geyer, R, Giorgi, M, Gobbo, B, Goertz, S, GORIN A., M, Grabmüller, 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 F., H, Hermann, R, Hess, C, Hinterberger, F, VON HODENBERG, M, Horikawa, N, Horikawa, S, D'Hose, N, Ilgner, C, IOUKAEV A., I, Ishimoto, S, Ivanov, O, Ivanshin, Yu, Iwata, T, Jahn, R, Janata, A, Jasinski, P, Joosten, R, JOURAVLEV N., I, Kabuss, E, Kang, D, Ketzer, B, KHAUSTOV G., V, KHOKHLOV Y. U., A, Kisselev, Yu, Klein, F, Klimaszewski, K, Koblitz, S, KOIVUNIEMI J., H, KOLOSOV V., N, KOMISSAROV E., V, Kondo, K, Königsmann, K, Konorov, I, KONSTANTINOV V., F, KORENTCHENKO A., S, Korzenev, A, KOTZINIAN A., M, KOUTCHINSKI N., A, Kouznetsov, O, Kral, A, KRAVCHUK N., P, KROUMCHTEIN Z., V, Kuhn, R, Kunne, F, Kurek, K, LADYGIN M., E, Lamanna, M, LE GOFF J., M, LEDNEV A., A, Lehmann, A, Levorato, Stefano, Lichtenstadt, J, Liska, T, Ludwig, I, Maggiora, A, Maggiora, M, Magnon, A, MALLOT G., K, Mann, A, Marchand, C, Marroncle, J, Martin, Anna, Marzec, J, Massmann, F, Matsuda, T, MAXIMOV A., N, Meyer, W, Mielech, A, MIKHAILOV Y. U., V, MOINESTER M., A, Mutter, A, Nagaytsev, A, Nagel, T, Nähle, 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, S, 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, Rocco, E, Rondio, E, ROZHDESTVENSKY A., M, RYABCHIKOV D., I, SAMOYLENKO V., D, Sandacz, A, Santos, H, SAPOZHNIKOV M., G, Sarkar, S, SAVIN I., A, Schiavon, Paolo, Schill, C, Schmitt, L, Schönmeier, P, Schröder, W, SHEVCHENKO O., Yu, SIEBERT H., W, Silva, L, Sinha, L, SISSAKIAN A., N, Slunecka, M, SMIRNOV G., I, Sosio, S, Sozzi, F, Srnka, A, Stinzing, F, Stolarski, M, 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, R, Weise, E, Weitzel, Q, Windmolders, R, Wirth, S, Wisblicki, W, Wollny, H, Zaremba, K, Zavertyaev, M, Zemlyanichkina, E, Zhao, J, Ziegler, R, Zvyagin, A. |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Quark
Nuclear and High Energy Physics Particle physics magnetic spectrometer: COMPASS Structure functions media_common.quotation_subject Hadron polarization: longitudinal FOS: Physical sciences polarized target cross section: ratio Deep inelastic scattering muon deuteron: deep inelastic scattering 01 natural sciences Asymmetry x-dependence High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex) charged particle: multiple production negative particle: electroproduction Experiment-HEP 13.88.+e 0103 physical sciences structure function: moment 010306 general physics Nuclear Experiment media_common Physics Quantum chromodynamics Muon Valence (chemistry) 010308 nuclear & particles physics High Energy Physics::Phenomenology cross section: difference CERN SPS positive particle: electroproduction Deuterium quark: valence High Energy Physics::Experiment muon: polarized beam quark: polarization 140-180 GeV spin: asymmetry 13.60.Hb Particle Physics - Experiment experimental results |
| Popis: | The semi-inclusive difference asymmetry A^{h^{+}-h^{-}} for hadrons of opposite charge has been measured by the COMPASS experiment at CERN. The data were collected in the years 2002-2004 using a 160 GeV polarised muon beam scattered off a large polarised ^6LiD target and cover the range 0.006 < x < 0.7 and 1 < Q^2 < 100 (GeV/c)^2. In leading order QCD (LO) the asymmetry A_d^{h^{+}-h^{-}} measures the valence quark polarisation and provides an evaluation of the first moment of Delta u_v + Delta d_v which is found to be equal to 0.40 +- 0.07 (stat.) +- 0.05 (syst.) over the measured range of x at Q^2 = 10 (GeV/c)^2. When combined with the first moment of g_1^d previously measured on the same data, this result favours a non-symmetric polarisation of light quarks Delta u-bar = - Delta d-bar at a confidence level of two standard deviations, in contrast to the often assumed symmetric scenario Delta u-bar = Delta d-bar = Delta s-bar = Delta s. 7 pages, 3 figures, COMPASS, revised: details added, author list updated |
| Databáze: | OpenAIRE |
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