Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-11-03
Physics
High Energy Physics
High Energy Physics - Experiment
invited talk at Transversity 2011 - 3rd International Workshop on Transverse Polarization Phenomena in Hard Scattering, Veli L
Scientific paper
The study of transverse spin and transverse momentum effects is an important part of the scientific program of COMPASS, a fixed target experiment at the CERN SPS. For these studies a 160 GeV/c momentum muon beam is scattered on a transversely polarized nucleon target, and the scattered muon and the forward going hadrons produced in DIS processes are reconstructed and identified in a magnetic spectrometer. The measurements have been performed on a deuteron target in 2002, 2003 and 2004, and on a proton target in 2007 and 2010. The results obtained for the Collins and Sivers asymmetries from the data collected in 2010 are here presented for the first time. They nicely confirm the findings of the 2007 run and allow for reduction of the errors by more than a factor of two.
Bradamante Franco
for the COMPASS Collaboration
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