A direct extraction of the Sivers distributions from spin asymmetries in pion and kaon leptoproduction

Understand

We present a point-by-point determination of the Sivers distributions from hadron leptoproduction data.

• The method, which relies on some simple assumptions, is based on the combined analysis of proton and deuteron observables.
• We make use of the single-spin asymmetries measured by COMPASS in semi-inclusive deep inelastic scattering of 160 GeV muons on transversely polarized proton and deuteron targets.