Anti-hyperon Polarization in $pA$ and $\Sigma^-A$ Collisions and Intrinsic Antidiquark State in Incident Baryon

TL;DR

This paper explores hyperon polarization in proton and sigma collisions using a quark-diquark model, proposing an intrinsic diquark-antidiquark state in incident baryons that influences polarization outcomes.

Contribution

It introduces the concept of an intrinsic diquark-antidiquark state in incident baryons and models its impact on hyperon polarization in high-energy collisions.

Findings

Intrinsic diquark-antidiquark state exists with about 7% probability.

The model explains polarization patterns in hyperon production.

Valence diquark tends to combine with spin-down sea quarks.

Abstract

We discuss the relation between the polarization of inclusively produced (anti)-hyperons and the incident baryon states in the framework of the constituent quark-diquark cascade model. We assume that there is an intrinsic diquark-antidiquark state in the incident baryon, in which the intrinsic diquark immediately fragments into a non-leading baryon and the antidiquark behaves as a valence constituent. It is also assumed that the valence (anti)diquark in the incident nucleon tends to combine selectively with a spin-down sea quark and, on the othe hand, the spin-up valence quark in the projectile is chosen by a sea (anti)diquadk in preference to the spin-down valence quark. It is found that the incident spin-1/2 baryon is mainly composed of a spin-0 valence diquark and a valence quark, and contains an intrinsic diquark-antidiquark state with a probability of about 7%.