Comparative study of the inclusive asymmetries induced by polarized protons and antiprotons at 16 GeV/$c$ at the U-70 accelerator

TL;DR

This paper reviews previous findings on inclusive pion asymmetries in polarized proton and antiproton collisions and discusses potential future experiments at U-70 to explore these asymmetries further.

Contribution

It highlights the need for comparative measurements of inclusive asymmetries using polarized protons and antiprotons at 16 GeV at U-70, proposing new experimental studies.

Findings

Previous experiments found significant asymmetries at large x_F and middle p_T.

Proton and antiproton collisions show opposite signs for pion asymmetries.

Future experiments can extend these studies at U-70 with polarized beams.

Abstract

The only comparative study of the inclusive pion single-spin asymmetries produced in the interactions of the polarized protons and antiprotons in collisions with unpolarized proton was carried out at E-704 experiment. Significant asymmetries were found at large $x_{F}$ and middle $p_{T}$, $\pi^{+}$ and $\pi^{0}$ asymmetries have positive signs while $\pi^{-}$ has negative one in the $p^{\uparrow}+p$ collisions, while in the $\bar{p}^{\uparrow}+p$ interactions the $\pi^{-}$ and $\pi^{0}$ asymmetries have positive signs while $\pi^{+}$ has negative sign. Similar experimental study can be done in the SPASCHARM experiment at U-70 accelerator at IHEP for various secondary particles with the use of 16 GeV polarized proton and antiproton beams.