[en] Dimuon production has been studied in a series of fixed-target experiments at Fermilab during the last two decades. Highlights from these experiments, together with recent results from the Fermilab E866 experiment, are presented. Future prospects for studying the parton distributions in the nucleons and nuclei using dimuon production are also discussed.

[en] Dimuon production has been studied in a series of fixed-target experiments at Fermilab during the last two decades. Highlights from these experiments are presented. Some future prospects for studying the parton distributions in the nucleons and nuclei using Drell-Yan production are also discussed.

[en] The role of the Drell-Yan process in studying nucleon spin is discussed. Recent results from the Fermilab E866 experiment on the angular distributions of Drell-Yan dimuons in p+p and p+d at 800 GeV/c are presented. These data are compared with the pion-induced Drell-Yan data, and with models which attribute the cos 2φ azimuthal distribution to the presence of the transverse-momentum-dependent Boer-Mulders structure function h₁^{perpendicular}. Constraints on the magnitude of the sea-quark h₁^{perpendicular} structure functions are obtained. Future prospects for studying the TMDs with Drell-Yan experiments at Fermilab and J-PARC are also discussed.

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[en] Dimuon production has been studied in a series of fixed-target experiments at Fermilab during the last two decades. Highlights from these experiments, together wih recent results from the Fermilab E866 experiment, are presented. Future prospects for studying the parton distributions in the nucleons and nuclei using dimuon production at Fermilab and J-PARC are also discussed.

[en] Dimuon production has been studied in a series of fixed-target experiments at Fermilab during the last two decades. Highlights from these experiments, together with recent results from the Fermilab E866 experiment, are presented. Future prospects for studying the parton distributions in the nucleons and nuclei using dimuon production are also discussed.

[en] Recent results from fixed-target dimuon production experiments at Fermilab are presented. Various QCD tests using dilepton production data are discussed. We emphasize that clear evidence for scaling violation in the Drell-Yan process remains to be established. Further theoretical and experimental work are needed to understand the polarization of the Drell-Yan pairs. We also discuss the nuclear medium effects for dilepton productions. In particular, we discuss the use of Drell-Yan data to deduce the energy-loss of partons traversing nuclear medium

[en] We have used a neutron radiography technique to investigate the spatial distribution of ³He atoms in very dilute liquid ³He-⁴He mixtures at temperatures below the superfluid transition temperature. By imposing heat currents and monitoring the subsequent redistribution of ³He within the sample volume we obtain a direct measurement of the relevant mass diffusion coefficient. Data from these experiments provides a striking demonstration of the manner in which the distribution of impurity atoms within the liquid can be influenced by the presence of a free surface

[en] In the kinematical region where the center of mass energy is much larger than all other scales, the Drell-Yan process can be formulated in the target rest frame in terms of the same color dipole cross section as low Bjorken-x deep inelastic scattering. Since the mechanisms for heavy dilepton production appear very different in the dipole approach and in the conventional parton model, one may wonder whether these two formulations really represent the same physics. We perform a comparison of numerical calculations in the color dipole approach with calculations in the next-to-leading order parton model. For proton-proton scattering, the results are very similar at low x₂ from fixed target to Relativistic Heavy Ion Collider (RHIC) energies, confirming the close connection between these two very different approaches. We also compare the transverse momentum distributions of Drell-Yan dileptons predicted in both formulations. The range of applicability of the dipole formulation and the impact of future Drell-Yan data from RHIC for determining the color dipole cross section are discussed. A detailed derivation of the dipole formulation of the Drell-Yan process is also included

[en] We report an analysis of the nuclear dependence of the yield of Drell-Yan (DY) dimuons from the 800 GeV/c proton bombardment of ²H, C, Ca, Fe, and W targets. A light-cone formulation of the DY process is employed in the rest frame of the nucleus. In this frame, for x₂<< x₁, DY production appears as bremsstrahlung of a virtual photon followed by decay into dileptons. We treat the two sources of nuclear suppression, energy loss and shadowing, in a consistent formulation. Shadowing, involving no free parameters, is calculated within the light-cone dipole formalism. Initial-state energy loss, the only unknown in the problem, is determined from a fit to the nuclear-dependence ratio versus x₁. With the assumption of constant energy loss per unit path length, we find -dE/dz=2.32±0.52±0.5 GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in nuclear environment