Azimuthal asymmetries in $p^\uparrow p \to {\rm jet}\, \pi\, X$

TL;DR

This paper investigates azimuthal asymmetries in pion distributions inside jets from high-energy proton-proton collisions, focusing on Sivers and Collins effects at RHIC energies, and explores the process dependence of the Sivers function.

Contribution

It provides a detailed phenomenological analysis of azimuthal asymmetries using the transverse momentum dependent generalized parton model and discusses process dependence of the Sivers function.

Findings

Results for asymmetries at $ oot s$=200 and 500 GeV

Identification of dominant Sivers and Collins mechanisms

Discussion on process dependence of the Sivers function

Abstract

We study the azimuthal asymmetries for the distributions of leading pions inside a jet produced inclusively in high-energy proton-proton collisions within the framework of the transverse momentum dependent generalized parton model. We present results for the RHIC center-of-mass energies $\sqrt{s}$ = 200 and 500 GeV, mainly for forward jet rapidities, in particular for the two mechanisms which dominate such asymmetries: the Sivers and the Collins effects. We also briefly discuss the case of inclusive jet production and, adopting the so-called colour gauge invariant parton model, we propose a phenomenological analysis of the process dependence of the quark Sivers function.