DAPNIA-06-341 |
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A new measurement of the Collins and Silvers asymmetrieson a transversely polarised deuteron target |
E. S. Ageev et al |
New high precision measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarised 6LiD target are presented. The data were taken in 2003 and 2004 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. Both the Collins and Sivers asymmetries turn out to be compatible with zero, within the present statistical errors, which are more than a factor of 2 smaller than those of the published COMPASS results from the 2002 data. The _nal results from the 2002, 2003 and 2004 runs are compared with naive expectations and with existing model calculations. |