How Could CP-Invariance and Physics Beyond SM Be Tested in Polarized Proton Collisions at RHIC?

TL;DR

This paper discusses how polarized proton collisions at RHIC can be used to test CP-invariance and explore physics beyond the Standard Model by measuring asymmetries that are suppressed or forbidden in the SM.

Contribution

It proposes using polarized proton collisions at RHIC to identify asymmetries indicative of CP-violation and new physics beyond the Standard Model.

Findings

Potential to detect nonzero asymmetries indicating new physics

Polarized collisions increase measurable correlations

Certain asymmetries are suppressed or forbidden in SM

Abstract

Just in months ahead, the first high luminosity collisions of two polarized proton beams are expected to occur at RHIC in BNL at sqrt{s} up to 500 GeV, bringing a new quality to the collider physics. In collisions of polarized particles, the presence of two axial vectors of initial polarizations, fully controlled by experimenters, may dramatically increase the number of available for tests correlations between participating vectors, generating asymmetries that could relatively easily be measured. In frame of Standard Model (SM), many of these asymmetries are either strongly suppressed or strictly prohibited. Therefore, if some of them were found nonzero, this could be an indication of a new physics beyond SM. If certain criteria met, it might be difficult to explain the observed nonzero correlations in theories without CP- and/or T-violation.