Eur. Phys. J. A (2016) 52: 156
https://doi.org/10.1140/epja/i2016-16156-4

Review

TMDs and SSAs in hadronic interactions

¹ Physics Department, Brookhaven National Laboratory, 11973-5000, Upton, NY, USA
² Dipartimento di Fisica, Università di Cagliari, Cittadella Universitaria, I-09042, Monserrato (CA), Italy
³ Sezione di Cagliari, INFN, C.P. 170, I-09042, Monserrato (CA), Italy

^* e-mail: umberto.dalesio@ca.infn.it

Received: 7 December 2015
Revised: 28 December 2015
Accepted: 3 January 2016
Published online: 17 June 2016

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-p_T 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.