English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

COMPASS is a fixed-target experiment in operation at the CERN North Area(SPS, M2 beam-line) since 2002. An important part of the broad physicsprogramme of the experiment is dedicated to the exploration of the transversespin-structure of the nucleon studying target transverse spin dependentazimuthal asymmetries (TSAs) arising in the Semi-Inclusive DIS (SIDIS) andDrell-Yan (DY) cross-sections. In addition to those measurements, COMPASS hasrecently studied also the TSAs weighted by powers of the hadron transversemomentum (in SIDIS) and virtual photon transverse momentum, $q_T$ (in DY). Inthe transverse momentum dependent (TMD) QCD approach, the conventional DY TSAsare interpreted as convolutions of the beam pion and of the transverselypolarized target proton TMD parton distribution functions (PDFs), while the$q_T$-weighted TSAs can be interpreted as simple products of transverse momentsof the TMD PDFs.  In 2015 and 2018 COMPASS performed two years of Drell-Yan data taking with a190 GeV/$c$ $\pi^-$ beam impinging on a transversely polarized NH$_3$ target.The analysis of the $q_T$-weighted TSAs performed on these two data sets ispresented in this paper. The results for DY Sivers $q_T$ weighted TSA arecompared with the expectations based on the studies of the weighted Siversasymmetry measured in the SIDIS process. Combining the information from SIDISand DY measurements, the pion Boer-Mulders TMD PDF is also studied.

Measurement of $\mathbf{q_T}$-weighted transverse-spin-dependent azimuthal asymmetries at COMPASS