Azimuthal asymmetries in single polarized proton-proton Drell-Yan processes

TL;DR

This paper investigates azimuthal asymmetries in polarized proton-proton Drell-Yan processes to extract information about the chiral-odd quark distributions within the nucleon across various experimental facilities.

Contribution

It analyzes specific azimuthal asymmetries in polarized Drell-Yan processes to probe the chiral-odd structure of the nucleon, providing guidance for experimental measurements.

Findings

Asymmetries can reveal chiral-odd quark distributions.

Measurements at RHIC, J-PARC, E906, and NICA are valuable.

Results help understand nucleon structure in valence and sea regions.

Abstract

We study the azimuthal asymmetries in proton-proton Drell-Yan processes with one incident proton being transversely or longitudinally polarized. We consider particularly the asymmetries contributed by the leading-twist chiral-odd quark distributions. We analyze the asymmetries with $\sin(2\phi+\phi_S)$ and $\sin(2\phi-\phi_S)$ modulations in transverse single polarized $p^\uparrow p$ Drell-Yan and $\sin2\phi$ asymmetries in longitudinal single polarized $p^\rightarrow p$ Drell-Yan at RHIC, J-PARC, E906 (Fermi Lab) and NICA (JINR). We show that the measurements of the asymmetries in those facilities can provide valuable information of the chiral-odd structure of the nucleon both in the valence and sea regions.