Speaker
Ms
Márcia Quaresma
(LIP-Lisbon)
Description
The Parton Distribution Functions (PDFs) and the spin structure of the nucleon are important topics studied by COMPASS in Semi-Inclusive Deep Inelastic Scattering. The Drell-Yan process is a complementary way to access the Transverse Momentum Dependent PDFs (TMD PDFs), using a transversely polarized target.
Studying the angular distributions of dimuons from the Drell-Yan reactions in the scattering of a negative pion beam with 190 GeV/c negative pions beam momentum off a transversely polarized proton target we are able to extract the azimuthal spin asymmetries and to access to the various TMD PDFs, like Sivers and Boer-Mulders functions. The start of the COMPASS DY experiment is scheduled for 2014. An important beam test has been already performed in 2009, using a hadron absorber prototype downstream of the target and a high intensity beam, to understand the absorber background reduction factors and the spectrometer response, and also to verify our results from Monte-Carlo simulations.
COMPASS aims at performing the first DY experiment with a transversely polarized target.
Author
Ms
Márcia Quaresma
(LIP-Lisbon)
Co-authors
Dr
Catarina Quintans
(LIP-Lisbon)
Mr
Gonçalo Terça
(LIP-Lisbon)
Prof.
Paula Bordalo
(LIP/IST)
Prof.
Sérgio Ramos
(LIP/IST)
