DRELL-YAN STUDIES IN pp REACTIONS AT FAIR

摘要

The nucleonic structure is far to be completely understood. A transverse momentum-dependent description of the nucleon structure is a crucial milestone for several forthcoming studies in a wide range of experimental scenarios. By means of antiproton beams, eventually polarized, that will be available at the future FAIR facility with a beam momentum up to 15 GeV/c, the nonperturbative region of the QCD could be accessed. One of the main goals of the forthcoming experiments at FAIR is the investigation of those Drell-Yan lepton pairs produced in proton-antiproton annihilations, taking advantage of the high expected luminosities. Drell-Yan studies are a unique tool to access the spin-dependent properties of the nucleon, and namely its transverse degrees of freedom. Transverse Momentum-Dependent (TMD) Parton Distribution Functions (PDFs), in particular, the Boer-Mulders, the Sivers, and the transversity distribution functions, could be widely investigated by means of the corresponding experimental azimuthal asymmetries. In later stages of FAIR, single- and double-spin asymmetries could be investigated as well. The Drell-Yan physics program which could be accessed at FAIR will be discussed in detail, with a particular focus on the PANDA experimental scenario.