The polarized electron accelerator at Jefferson Laboratory (JLab) in Newport News, Virginia, USA yields a robust program for the study of the spin physics of the nucleon. The CLAS detector and longitudinally polarized target in Hall-B at JLab were employed in multiple measurements of spin-structure functions for the proton and neutron in the resonance and DIS regions at beam energies of up to...
The STAR experiment at the Relativistic Heavy-Ion Collider at Brookhaven National
Laboratory is carrying out a spin physics program in high-energy polarized proton collisions
to gain a deeper insight into the spin structure and
dynamics of the proton.
The collision of polarized protons at $\sqrt{s}=510\,$GeV opens a new era of spin-flavor
structure measurements from $W^{+}/W^{-}$ boson...
The W measurement at RHIC (Relativistic Heavy Ion Collider) provides unique access to the sea quark polarization of the proton. By measuring decay leptons from parity-violating W bosons, which only coupled to left-handed quarks and right-handed antiquarks, a clean, fragmentation free measurement is possible in addition to natural flavor separation. In this talk, we present status and...
We present the first extraction of the transversity distribution in the framework of collinear factorization based on the global analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets and in proton-proton collisions with one transversely polarized proton. The extraction relies on the knowledge of dihadron fragmentation functions, which are taken from...
We discuss the first attempt at a "global fit" of unpolarized Transverse Momentum Distributions, using data from semi-inclusive deep inelastic scattering and Drell-Yan processes. We describe the main features of this extraction, compare its outcome with new data, and discuss what further developments are needed.
