Measurement of the Collins and Sivers asymmetries on transversely polarised protons

The Collins and Sivers asymmetries for charged hadrons produced in deeply inelastic scattering on transversely polarised protons have been extracted from the data collected in 2007 with the CERN SPS muon beam tuned at 160 GeV/c. At large values of the Bjorken x variable non-zero Collins asymmetries...

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Veröffentlicht in:	Physics letters. B 2010-09, Vol.692 (4), p.240-246
Hauptverfasser:	Alexandrov, Yu, Amoroso, A., Austregesilo, A., Balestra, F., Barth, J., Bernhard, J., Bisplinghoff, J., Bradamante, F., Burtin, E., Chaberny, D., Chiosso, M., Cicuttin, A., Torre, S.Dalla, Das, S., Dhara, L., Diaz, V., Donskov, S.V., Doshita, N., Dünnweber, W., Efremov, A., Elia, C., Eversheim, P.D., Eyrich, W., Filin, A., Fischer, H., Franco, C., Gautheron, F., Gavrichtchouk, O.P., Giorgi, M., Gobbo, B., Guskov, A., von Harrach, D., Herrmann, F., Hinterberger, F., d'Hose, N., Ivanshin, Yu, Jahn, R., Jegou, G., Kabuß, E., Kang, D., Ketzer, B., Khokhlov, Yu.A., Kisselev, Yu, Klimaszewski, K., Konorov, I., Konstantinov, V.F., Kotzinian, A.M., Kouznetsov, O., Kowalik, K., Krämer, M., Kuhn, R., Kunne, F., Le Goff, J.M., Lehmann, A., Levorato, S., Lichtenstadt, J., Liska, T., Maggiora, A., Mann, A., Massmann, F., Meyer, W., Michigami, T., Mikhailov, Yu.V., Moinester, M.A., Nassalski, J., Negrini, T., Neubert, S., Neyret, D., Nikolaenko, V.I., Olshevsky, A.G., Panzieri, D., Pawlukiewicz-Kaminska, B., Perevalova, E., Peshekhonov, D.V., Pochodzalla, J., Pontecorvo, G., Pretz, J., Richter, A., Samoylenko, V.D., Santos, H., Schiavon, P., Schlüter, T., Schopferer, S., Sinha, L., Sissakian, A.N., Smirnov, G.I., Sozzi, F., Stolarski, M., Sulej, R., Takekawa, S., Tessarotto, F., Teufel, A., Uhl, S., Uman, I., Virius, M., Vlassov, N.V., Vossen, A., Zemlyanichkina, E., Zhao, J., Zvyagin, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Collins asymmetry COMPASS Exact sciences and technology Nuclear Experiment Nuclear physics Physics Proton Sivers asymmetry The physics of elementary particles and fields Transverse spin effects
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Beschreibung
Zusammenfassung:	The Collins and Sivers asymmetries for charged hadrons produced in deeply inelastic scattering on transversely polarised protons have been extracted from the data collected in 2007 with the CERN SPS muon beam tuned at 160 GeV/c. At large values of the Bjorken x variable non-zero Collins asymmetries are observed both for positive and negative hadrons while the Sivers asymmetry for positive hadrons is slightly positive over almost all the measured x range. These results strongly support the present theoretical interpretation of these asymmetries, in terms of leading-twist quark distribution and fragmentation functions.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2010.08.001