Abstract
Hadronic collisions with transversely polarized protons are an important part of the quest to under- stand the transverse spin structure of the proton. Experiments at RHIC collected large datasets at center of mass energies of 200 GeV and 500 GeV, accessing a kinematic regime where factorization is expected to hold. The STAR detector at RHIC, due to its azimuthal symmetry, particle identification capabilities and large acceptance compared with other experiments with polarized protons, is in a unique position to study transverse spin phe- nomena in p + p ↑ . This contribution will highlight measurements of transversity using di-hadron correlations, transverse single spin asymmetries in jets, measurements sensitive to the origins of the large single spin asym- metries measured in the forward direction, transverse spin asymmetries in W production, which are sensitive to modified universality effects of Sivers function as well as short and long-term upgrades at STAR.
Highlights
The study of transverse single spin asymmetries (TSSAs) in p + p↑ collisions has a long history
The twist3 framework only uses one scale, so the observables have to be constructed with only one final state momentum vector in hand. These developments show that p + p collisions provide access to QCD dynamics that are very difficult to access in other experiments
The Solenoidal Tracker at RHIC (STAR) [7] detector at the Relativistic Heavy Ion Collider (RHIC) is unique since its comparatively large acceptance allows the reconstruction of jets in polarized proton-proton collisions
Summary
The study of transverse single spin asymmetries (TSSAs) in p + p↑ collisions has a long history (see [1] and references therein). For 2-2 scattering, xF = x1 − x2, where xi are the x values of the partons participating in the scattering These developments show that p + p collisions provide access to QCD dynamics that are very difficult to access in other experiments. Experiments at a p + p collider are sensitive to a wide range of scattering angles, they are able to access valence quarks at relatively high values of x as well as sea-quarks. These proceedings will describe some of the unique measurements done by the STAR collaboration at RHIC to explore the transverse spin structure. The following four sections focus on the measurement of the collinear transverse spin structure (section 3), TMD observables(section 4 ), very forward single scale measurements (section 5) and TMD observables in electroweak-production (section 6)
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