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 final results from the 2002, 2003 and 2004 runs are compared with naive expectations and with existing model calculations. These data are still today the only existing measurements on transversely polarised deuterons. Together with HERMES proton results and Belle e+e- results they allowed for the extraction of the transversity functions, the Collins fragmentation functions, and the Sivers functions.

A New measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target

BRADAMANTE, FRANCO;BRESSAN, Andrea;GIORGI, MARCELLO;MARTIN, ANNA;SCHIAVON, PAOLO;
2007-01-01

Abstract

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 final results from the 2002, 2003 and 2004 runs are compared with naive expectations and with existing model calculations. These data are still today the only existing measurements on transversely polarised deuterons. Together with HERMES proton results and Belle e+e- results they allowed for the extraction of the transversity functions, the Collins fragmentation functions, and the Sivers functions.
2007
http://www.sciencedirect.com/science/article/pii/S0550321306008571
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/1905446
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