A sub(N) in proton-proton collisions and the role of twist-3 fragmentation

We review and give an update on the current status of what causes transverse single-spin asymmetries (TSSAs) in semi-inclusive processes where a single hadron is detected in the final state, especially those involving proton-proton (pp) collisions. In particular, we provide a new analysis within col...

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Bibliographic Details
Published in:EPJ Web of conferences 2015-01, Vol.85, p.02013-1-02013-6
Main Authors: Pitonyak, Daniel, Kanazawa, Koichi, Koike, Yuji, Metz, Andreas
Format: Article
Language:English
Subjects:
Asymmetry
Collisions
Consistency
Factorization
Fragmentation
Hadrons
Relativistic Heavy Ion Collider
Transverse momentum
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Summary:We review and give an update on the current status of what causes transverse single-spin asymmetries (TSSAs) in semi-inclusive processes where a single hadron is detected in the final state, especially those involving proton-proton (pp) collisions. In particular, we provide a new analysis within collinear factorization of TSSAs in high transverse momentum charged and neutral pion production in pp collisions at the Relativistic Heavy Ion Collider (RHIC). This study incorporates the so-called twist-3 fragmentation term and shows that one can describe RHIC data through this mechanism. Moreover, by fixing other non-perturbative inputs through extractions of transverse momentum dependent functions in e super(+)e super(-) arrow right h sub(1)h sub(2)X and semi-inclusive deep-inelastic scattering (SIDIS), we provide for the first time a consistency between certain spin/azimuthal asymmetries in all three reactions (i.e., pp, e super(+)e super(-), and SIDIS).
ISSN:2100-014X
DOI:10.1051/epjconf/20158502013