TMDs and SSAs in hadronic interactions
E.C. Aschenauer (1), U. D'Alesio (2,3), F. Murgia (3) ((1) BNL, USA,, (2) University of Cagliari, Italy, (3) INFN, Cagliari, Italy)
TL;DR
This paper reviews the current experimental and theoretical understanding of transverse single spin asymmetries in proton-proton collisions, focusing on high-$p_T$ processes and comparing different theoretical frameworks with recent RHIC data.
Contribution
It provides a comprehensive overview of TMD and twist-3 formalisms for tSSAs, including comparisons and recent experimental results from RHIC.
Findings
TMD and twist-3 formalisms show consistent descriptions of tSSAs.
Recent RHIC data offer new insights into spin asymmetry mechanisms.
Theoretical models are compared with experimental results across multiple processes.
Abstract
We present an overview on the current experimental and phenomenological status of transverse single spin asymmetries (tSSAs) in proton-proton collisions. In particular, we focus on large- inclusive pion, photon, jet, pion-jet production and Drell-Yan processes. For all of them theoretical estimates are given in terms of a generalised parton model (GPM) based on a transverse momentum dependent (TMD) factorisation scheme. Comparisons with the corresponding results in a collinear twist-3 formalism and in a modified GPM approach are also made. On the experimental side, a selection of the most interesting and recent results from RHIC is presented.
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