Directed flow as a signal of a liquid state of transient matter

TL;DR

This paper proposes that directed flow in hadronic reactions, caused by the rotation of transient matter, can indicate that this matter exists in a liquid state, similar to observations in nucleus collisions.

Contribution

It introduces the idea that directed flow can serve as a signal of the liquid state of transient matter in hadronic reactions, drawing an analogy with nucleus collision phenomena.

Findings

Directed flow may originate from the rotation of transient matter.

Presence of directed flow suggests the transient matter is in a liquid state.

Analogy established between hadronic reactions and nucleus collisions.

Abstract

Directed flow $v_1$, observable introduced for description of nucleus collisions is discussed. We consider a possible origin of the flow in hadronic reactions as a result of rotation of the transient matter and trace analogy with nucleus collisions. It is argued that the presence of directed flow can serve as a signal that transient matter is in a liquid state.