Abstract
Transverse single-spin asymmetries (SSA) are expected to be small in perturbative QCD because of the chiral nature of the theory. Experiment shows large transverse SSA for particle produced in special kinematics. This contribution reviews the experimental situation and provide an outlook for future measurements.
Highlights
We agree that Quantum Chromodynamics (QCD) is the theory of the strong interaction
Since the up and down quarks are so light and QCD is a vector gauge theory, we expect that helicity is essentially unchanged at the q → qg vertex [1], with the probability for helicity flip being proportional to the quark mass
My conclusions will be brief and my outlook will be long, because there remains much to learn from p↑ p collisions at Relativistic Heavy Ion Collider (RHIC)
Summary
We agree that Quantum Chromodynamics (QCD) is the theory of the strong interaction. The Sivers function is important to understand because it can provide new insight into the structure of the proton, regarding the role of orbital motion of the confined partons [7, 8], model independent connections have not been found. This contribution reviews recent experimental measurements of transverse SSA in hadroproduction. Operation of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory includes polarized proton collisions, at center-of-mass energies spanning from Given that understanding emerges when experiment confronts theory, some discussion will be provided
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