出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present physics motivations and experimental consideration for a fixed-target polarized Drell- Yan dimuon experiments at RHIC and at J-PARC. Dimuons from the Drell-Yan process are detected using a spectrometer based on the existing Fermilab E906/SeaQuest spectrometer. Through the detections of the Drell-Yan events, a broad physics program addressing various issues in QCD is pursued. The primary goal of the proposed experiments is to extract the Sivers parton distribution function in the valence-quark region from the measurement of the single-spin asymmetry. The sensitivity of the proposed fixed-target experiments will provide a stringent test of the QCD prediction that the Sivers function in the Drell-Yan process has an opposite sign to that in deepinelastic scattering. Many other rich programs of spin-dependent structure function physics are carried out through the measurements of unpolarized, singly polarized, and doubly polarized Drell-Yan processes.
