COMPASS Results on Collins and Sivers Asymmetries
Andrea Bressan (for the COMPASS Collaboration)
TL;DR
The paper presents new measurements of Collins and Sivers asymmetries in deep inelastic scattering from the COMPASS experiment, highlighting the transverse spin effects in hadron azimuthal distributions.
Contribution
It reports the first results of Collins and Sivers asymmetries measured on a proton target by COMPASS, expanding previous deuteron data.
Findings
Observation of non-zero Collins asymmetries for protons.
Observation of non-zero Sivers asymmetries for protons.
Comparison with theoretical models shows consistency.
Abstract
In the list of the main items studied by the CERN COMPASS experiment there are the transverse spin and momentum effects visible in the azimuthal distributions of hadrons produced in the deep inelastic scattering. In the years 2002-2004 COMPASS has collected data with a 6LiD target with the polarization oriented transversely with respect to the muon beam direction for about 20% of the running time; in 2007, COMPASS has used for the first time a proton NH_3 target with the data taking time equally shared between longitudinal and transverse polarization of the target. After reviewing the results obtained with the deuteron, the new results for the Collins and Sivers asymmetries of the proton will be presented.
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