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Towards an explanation of transverse single-spin asymmetries in proton-proton collisions: The role of fragmentation in collinear factorization
Kanazawa, K Koike, Y Metz, A Pitonyak, D
Kanazawa, K
Koike, Y
Metz, A
Pitonyak, D
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Journal Article
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2014-06-05
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10.1103/PhysRevD.89.111501
Abstract
We study the transverse single-spin asymmetry for single-hadron production in proton-proton collisions within the framework of collinear twist-3 factorization in quantum chromodynamics. By taking into account the contribution due to parton fragmentation, we obtain a very good description of all high transverse-momentum data for neutral and charged pion production from the Relativistic Heavy Ion Collider. Our study may provide the crucial step toward a final solution to the long-standing problem of what causes transverse single-spin asymmetries in hadronic collisions within quantum chromodynamics. We show for the first time that it is possible to simultaneously describe spin/azimuthal asymmetries in proton-proton collisions, semi-inclusive deep-inelastic scattering, and electron-positron annihilation by using collinear twist-3 factorization in the first process along with transverse-momentum- dependent functions extracted from the latter two reactions. © 2014 American Physical Society.
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Physical Review D - Particles, Fields, Gravitation and Cosmology
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