Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars
Drell-Yan at PHENIX
Presented by Katherine DeBlasio (UNM)
The contributions of the constituents of the proton to its spin are not well understood. The collinear QCD prediction for transverse asymmetries in polarized proton collisions has been proven incorrect by FermiLab E704 experiment. Dennis Sivers, in 1990, proposed a mechanism that could provide a solution that would include transverse spin effects. The mechanism requires both a gauge link (a gluon exchange between either initial- or final-states and the proton remnant) and orbital angular momentum of the constituents of the proton. This Sivers asymmetry has been measured in Deep Inelastic Scattering (DIS) experiments, and theorists have predicted that the magnitude of the Sivers function should be the same for DIS and Drell-Yan channels, but with a sign change. The PHENIX experiment at BNL will attempt to measure the transverse asymmetry in the Drell-Yan process in order to validate this theoretical interpretation of the Sivers' mechanism.
2:00 pm, Tuesday, February 18, 2014
PAIS-2540, PAIS
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