CP-violation in high-energy collisions of polarized protons

TL;DR

This paper explores the potential for detecting CP/T-violation in polarized proton collisions at RHIC-BNL through a proposed asymmetry measurement, which could reveal physics beyond the Standard Model.

Contribution

It introduces a new single transverse spin asymmetry as a sensitive indicator of CP/T-violation and analyzes mechanisms beyond the Standard Model that could produce observable effects.

Findings

Potential for large CP/T-violation signals in polarized proton collisions.

Estimates of asymmetry magnitude in supersymmetric and tensor interaction models.

Feasibility of observing these effects in future experiments.

Abstract

We study the possibility of a large CP/T-violation in lepton pair production in the collisions of polarized protons at RHIC-BNL. We propose the single transverse spin asymmetry which quantifies the possible CP/T-violating effect in this reaction as a sensitive indicator of physics beyond the standard model(SM). We consider two examples of mechanisms beyond the SM which can generate a non-zero asymmetry of this type. They rely on the R-parity violating interactions of supersymmetric models and on phenomenological tensor interactions. We estimate the prospects for observing this effect in future experiments.