Spin Effects in Diffractive $Q \bar Q$ Production and Compass Experiment

TL;DR

This paper calculates the double spin asymmetry in diffractive quark-antiquark and vector meson production at COMPASS energies, exploring the Pomeron-proton coupling's spin structure and suggesting the A_{lT} asymmetry as a better probe.

Contribution

It provides a theoretical analysis of spin asymmetries in diffractive processes and identifies the A_{lT} asymmetry as a promising observable for studying Pomeron-proton spin interactions.

Findings

A_{ll} asymmetry is not effective for studying Pomeron spin structure.

A_{lT} asymmetry could be a suitable observable for this purpose.

The dependence of asymmetries on Pomeron-proton coupling structure is analyzed.

Abstract

We calculate the double spin asymmetry of the diffractive $Q \bar Q$ and vector meson leptoproduction at COMPASS energies. We analyze dependences of the asymmetry on the structure of the Pomeron-proton coupling. It is shown that it is difficult to study the spin structure of the Pomeron coupling with the proton from the A_{ll} asymmetry. The A_{lT} asymmetry might be an appropriate object for this investigation.