Abstract
In the polarised Drell–Yan experiment at the COMPASS facility at CERN the beam of negatively-charged pions with 190GeV/c momentum and intensity about 108 pions/s interacted with transversely polarised NH3 target. Muon pairs produced in Drell–Yan process (DY) were detected. Recently, the first ever Transverse Spin Asymmetries (TSAs) measurement in DY has been presented by COMPASS. A complementary analysis of the TSAs weighted by powers of the dimuon transverse momentum qT are presented. In the Transverse Momentum Dependent (TMD) PDF formalism, the qT-weighted TSAs can be written in terms of products of the TMD PDFs of two colliding hadrons, unlike the conventional TSAs, which are their convolutions over quarks transverse momenta. The results are compared in a straightforward way with the weighted Sivers asymmetry in the SIDIS process, released by COMPASS in 2016.
Highlights
In the Transverse Momentum Dependent (TMD) Parton Distribution Functions (PDFs) formalism, the qT-weighted Transverse Spin Asymmetries (TSAs) can be written in terms of products of the TMD PDFs of two colliding hadrons, unlike the conventional TSAs, which are their convolutions over quarks transverse momenta
The hadron structure can be described at leading twist by eight Transverse Momentum Dependent (TMD) Parton Distribution Functions (PDFs), which depend on the fraction x of the hadron momentum carried by the parton and the transverse component of the parton momentum kT2
They have been probed in Semi-Inclusive Deep Inelastic Scattering (SIDIS), where the cross-section contains convolutions of the TMD PDFs and fragmentation functions [1]
Summary
To cite this article: Jan Matoušek and COMPASS Collaboration 2017 J. View the article online for updates and enhancements. - Global extraction of partonic transverse momentum distributions from semiinclusive deep inelastic scattering and Drell-Yan data Filippo Delcarro, Alessandro Bacchetta, Cristian Pisano et al. - Future Drell-Yan measurements in COMPASS Catarina Quintans and the COMPASS Collaboration. - Opportunities with Drell-Yan Scattering at Fermilab Paul E Reimer and the Fermilab SeaQuest Collaboration. This content was downloaded from IP address 131.169.5.251 on 11/01/2018 at 20:52. Charles University, Faculty of Mathematics and Physics, 180 00 Prague, Czech Republic and Trieste Section of INFN, 341 27 Trieste, Italy
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