33rd International Workshop on Deep Inelastic Scattering and Related Subjects (DIS2026)

Update of transverse-spin azimuthal asymmetries for $K^0$ production in SIDIS

7 May 2026, 09:20

8m

Sala IMPERIALE B. (Hotel Carlton)

Flash talk WG5 Spin and 3D Structure WG5 Spin and 3D-structure

Speaker

Siranush Asatryan (A. I. Alikhanyan National Science Laboratory)

Description

Transverse-spin-dependent azimuthal asymmetries in semi-inclusive deep-inelastic scattering (SIDIS) provide access to transverse-momentum-dependent parton distributions and fragmentation functions. In 2022, COMPASS collected SIDIS data with a 160 GeV/$c$ muon beam and a transversely polarised deuteron target, complementing the earlier COMPASS measurements on the proton. We present an update of transverse-spin azimuthal asymmetries for $K^0$ production, with emphasis on the Collins and Sivers modulations. Owing to the strange-quark content of the final state, these measurements offer new inputs for flavour separation and the study of spin–momentum correlations in the nucleon. The results pave the way for identified-hadron analyses using the 2022 deuteron data set.

Presentation materials

Asatryan_DIS2026.pdf